Where results make sense

About us   |   Why use us?   |   Reviews   |   PR   |   Contact us

Sulfosalt mineralogy today   (Site not responding. Last check: 2007-10-11) The following points are considered: scientific and practical significance of sulfosalt minerals; definition of "sulfosalts" in mineralogy; general features of sulfosalts and their "mysterious" pecularities, which are explained from the nonstoichiometry standpoint; general features of non-stoichiometric compounds; development of the conception of non-stoichiometry and homologous series of sulfosalts; principles of classification of sulfosalts. In fact, it is a classification of ideal homologous structures, but not sulfosalt minerals, because chemical factors are not given enough consideration and a homologous series combines often chemically different minerals with the same topology of structure. But since minerals are natural chemical compounds, sulfosalts are proposed to be devided first of all on a chemical basis (at first on the basis of sulfoanions and then after metals). www.igem.ru /igem/mine/sulfosalts.htm   (2031 words)

General Types of Gold Deposits The mineralization of these particular deposits is characterized essentially by quartz; carbonate minerals, pyrite, arsenopyrite, base-metal sulfide minerals, and a variety of sulfosalt minerals. The principal gold minerals are the native metal and various tellurides; aurostibite occurs in some deposits. The valuable ore minerals are native gold, generally low in silver, auriferous pyrite, and auriferous arsenopyrite. www.minelinks.com /alluvial/goldDeposits2.html   (863 words)

The Mineralogical Record - Mineral Abstracts The formulae of sulfides and sulfosalt minerals are calculated on the basis of the total number of atoms. It is ironic that the latter properties are those which alerted the collector to bring an unknown mineral to a professional mineralogist for identification and, subsequently, for characterization as a new species. The unit cell of a mineral should contain a number of oxygens equal to an integer such as 32; if a cation or group of cations is made equal to an integer, the result may be 32.47 oxygens in the unit cell. www.minrec.org /mineralintro.asp   (2777 words)

[No title] Sulfosalts richer in Bi accompany later tetrahedrite, bournonite and chalcostibite. Precipitation of Sb sulphides and sulfosalts was preceded by deposition of mesothermal quartz with scheelite and pyrite-arsenopyrite (with gold). The thermochemical parameters of sulfosalts were approximated by Craig and Barton (1973) as for mixtures of simple sulphides with an assumption of ideal mixing. www.fns.uniba.sk /prifuk/casopisy/geol/199953/chovan.txt   (3364 words)

Minerals of the Sweet Home mine Mineralogical Record - Find Articles   (Site not responding. Last check: 2007-10-11) Minerals reported and confirmed from the mine are discussed in the following pages; they are listed and cross referenced as to source in Table 6. Minerals that are part of the massive ore assemblage identified by petrographic techniques and described by Honea (1992) and Wenrich and Aumente-Modreski (this issue), in general have also been identified as euhedral crystals in hand specimens, with the exception of stromeyerite, which has not yet been seen in hand specimens. Gangue minerals represented in the veins are common species, and, except for the rhodochrosite which occurs in superior large crystals, calcite, quartz and associated species occur in smaller, well-formed crystals. www.findarticles.com /p/articles/mi_qa3672/is_199807/ai_n8785157   (376 words)

[No title] The influence of minor elements (Cu,Fe,Bi...) on the stability of the Pb-Sb sulfosalts was not studied and is not known. Very smal l differences between free energies of sulfosalts can be responsible for metastable persistance of the sulfosalts beyond their stability range. The principal sulfosalt from Mal\'e9 \'8eelezn\'e9 is robinsonite (}{\scaps M}{\caps\f0\fs16\cf8 ajzlan}{ et al. www.fns.uniba.sk /prifuk/casopisy/geol/199953/chovan.rtf   (3329 words)

Mineral Classificatioin by Gail Dunning Since many minerals show isostructural properties between different chemical classes, those minerals are listed under each class where they are found to be isostructural but retain their unique letter designation based on their chemical class. When known, a short description of the mineral structure is given, allowing a glance at the atomic arrangement and the fundamental framework of each mineral or series of minerals. Hawthorne, F. (1984) The crystal structure of stenonite and the classification of the aluminofluoride minerals. baymin.org /Pubs/Classification.html   (1226 words)

Franckeite - Wikipedia, the free encyclopedia , belongs to a family of complex sulfide minerals. Franckeite has an average density of 5.7 and can be both grayish fl, flish gray in color.  This article about a specific mineral, mineraloid, or rock type is a stub. en.wikipedia.org /wiki/Franckeite   (101 words)

Gold Deposit   (Site not responding. Last check: 2007-10-11) The principal ore minerals of gold are the native metal, aurostibite, and the various tellurides. The late hydrothermal stage is commonly marked by sulfide mineralization that occupies late fractured and faulted parts of the rocks of all zones. The silver is present mainly in galena, tetrahedrite, and other such minerals; the gold is invariably native and occurs in association with pyrite, pyrrhotite, molybdenite, chalcopyrite, and other copper sulfides. www.iahgsmirror.com /html/gold_deposit.html   (2800 words)

Geoenvironmental Model of Volcanogenic Massive Sulfide Deposits These trace elements generally occur in primary ores as sulfide and sulfosalt minerals including chalcopyrite, sphalerite, galena, arsenopyrite, tennantite-tetrahedrite, cobaltite, and others, as well as in solid solution and/or mineral inclusions in pyrite and pyrrhotite. Trace metals are mobilized when sulfide minerals dissolve during weathering; in relatively dry periods, metals and acidity are commonly stored as metal-sulfate minerals, most of which are highly soluble. The presence, composition, and distribution of carbonate minerals are important factors in determining the acid­neutralizing capacity of mine wastes and unmined deposits. www.em.gov.bc.ca /mining/geolsurv/MetallicMinerals/metallogeny/O98_abstract_alpers.HTM   (1137 words)

New Utah Minerals - Utah Geological Survey It is a rare mineral associated with quartz gangue and is characterized by colorless, transparent crystals.The mineral has an adamantine luster and is brittle, with uneven to conchoidal fracture. Fangite is a thallium arsenic sulfosalt found at the Mercur gold deposit in the southern Oquirrh Mountains of Tooele County. Associated minerals are barite, calcite, orpiment, realgar, lorandite, raguinite, and pyrite. www.ugs.state.ut.us /utahgeo/rockmineral/newminerals/newmin1.htm   (513 words)

Breccia pipe uranium deposits DESCRIPTION: Uraninite and associated sulfide, arsenide, sulfate, and arsenic-sulfosalt minerals as disseminated replacements and minor fracture fillings in distinct bodies in near-vertical cylindrical solution-collapse breccia pipes, 30-175 m in diameter and 1,000 m in length. Breccia clasts as wide as 10 m across, consisting mainly of sandstone (~90 percent) and siltstone (~10 percent), occur in a matrix of quartz grains that is commonly well-cemented with carbonate minerals. ORE MINERALOGY: Principal ore minerals: uraninite±roscoelite+tyuyamunite* +torbernite*+uranophane *+zeunerite*+chalcopyrite+bornite*±chalcocite*±malachite*+azurite *+brochantite *+volborthite+naumannite. pubs.usgs.gov /bul/b2004/html/bull2004breccia_pipe_uranium_deposits.htm   (1086 words)

SPECIAL ASSEMBLAGES Chapter 12. Mineral assemblages Among these ore minerals are silicates and carbonate minerals, giving rise to a great variety of ore-silicate-carbonate assemblages. This assemblage is host to a substantial number of uncommon-to-rare sulfosalt minerals, among them zinkenite, tennantite, baumhauerite, seligmannite, and others. This assemblage of calcium silicates, illustrated in figure 12-20, is a primary and important one in which bustamite hosts Ca and Mn, diopside hosts Ca and Mg, andradite hosts Ca and Fe, and microcline hosts K and Al. franklin-sterlinghill.com /dunn/ch12/special_assemblages.stm   (1477 words)

SAMEX MINING CORP - SMXMF Annual and Transition Report (foreign private issuer) (20-F) ITEM 4. INFORMATION ON THE ... The area of mineralized porphyry exposures is +800 by +700 meters and is mostly in an area of pampa and low-lying hills with numerous prospected showings of fault-hosted, fracture-controlled and veinleted, oxide-copper mineralization. The gold mineralization occurs in mantos-like layers (intervals of altered tuff units) in a package of andesite flows and diorite sills which are gently dipping and positioned at shallow depths. The vein and mantos zinc-lead-silver mineralization occurs in a Silurian-Ordovician sequence of gray siltite and shale with prominent quartzite layers. sec.edgar-online.com /2004/05/05/0001137171-04-000565/section5.asp   (9379 words)

Sulfosalt minerals Did You Mean sulfosalt_minerals   (Site not responding. Last check: 2007-10-11) Sulfosalt minerals are those complex sulfide minerals with the general formula: A In the more simple sulfosalt formulas m = p = 3n is an approximation. There are about 200 known sulfosalt minerals, a few of the more common or important (as ore minerals) sulfosalt minerals are: www.did-you-mean.com /Sulfosalt_minerals.html   (121 words)

Class 6 Volcanic Rocks As a result, there is a zonation of metals from a proximal zone of copper-rich mineralization to a distal zone of lead- and zinc-rich mineralization. Ore minerals include native gold and silver, and telluride and sulfosalt minerals containing variable proportions of gold, silver, lead and antimony. The ore minerals occur in a gangue of quartz, chalcedony, carbonate minerals, fluorite, barite, sericite, adularia and clay minerals (Figure 6-5). www.dmtcalaska.org /course_dev/explogeo/class06/notes06.html   (2123 words)

Synthesis of novel sulfosalt materials with curved crystalline habits A group of the complex iron-containing sulfosalt minerals exhibit a non-commensurate layered crystalline structure and are found with curved crystals. With the exception of a few phase studies, little is known about the chemistry of the minerals or the mechanism that prompts the formation of these misfit-layered materials. A series of synthesis reactions were carried out to examine the effects on the properties and structures of the sulfosalts that are induced by the substitutions into the crystal lattice. digitalcommons.utep.edu /dissertations/AAI3081128   (309 words)

Glasgow ePrints Service - Laser combustion analysis of delta S-34 of sulfosalt minerals: Determination of the ... The correction factors are known for common sulfides and anhydrite but not, hitherto, for stibnite and the sulfosalt minerals, which are important constituents of many classes of ore deposits. The Gibbs free energies of formation of these phases have been approximated by the sulfide summation method, and the correlation of DeltaG(298)(0), with the correction factor for the sulfosalts fits well with the trend previously established for simple sulfides. There is an excellent correlation between the fractionation factor and mineral composition, a parameter that does result in bond strength variations (e.g., mol fraction of PbS in sulfosalts), allowing estimation of the correction factors for simple intermediate compositions. eprints.gla.ac.uk /archive/00000473   (411 words)

[No title] The section line through the holes is positioned across the southeast end of mineralized Zone III in the eroded-out core zone of the Cerro Eskapa stratovolcano (Figure 3). Marked changes in mineral composition and character of ore mineralization occur with depth from moderate- to high-grade, silver-lead-antimony sulfosalt at shallow levels, which is more diffuse (disseminated/vug and fracture infillings), downward into discrete intervals of veins, veinlets and associated dense disseminations of gold-bearing, high-grade, copper-silver-antimony-bismuth-mercury sulfide/sulfosalt intersected in DDH-EK-01-11 (Figures 6 and 7). The latter veins and veinlets cross cut the footwall, vuggy silica rock strands and are considered to be late-stage or secondary in nature. www.samex.com /Coreshack/Bolivia/Eskapa/Rosetta/Technical.html   (895 words)

M. Hitzman - Irish-type Zn-Pb-Ag Deposits The age of mineralization is known with certainty only for the Navan deposit which formed several million years after deposition of its host sediments; geologic relationships suggest that the other Irish deposits formed at approximately the same time as the Navan deposit. This period is marked in the Irish Midlands by the establishment of a complex facies mosaic consisting of fault-controlled carbonate basins and high-standing platforms indicating an extensional tectonic environment. The apparent contemporaneity of mineralization and tectonism, together with the regional zoning of metals and dolomitization, suggests that the Hercynian Orogeny was a fundamental driving force for mineralization in the Irish orefield. www.mines.edu /fs_home/mhitzman/pages/irish_type.html   (690 words)

IN MEMORIAM of Acad. Prof. Ivan KOSTOV   (Site not responding. Last check: 2007-10-11) Mineral and chemical composition of the alkalic igneous rocks of the Shipka Mountain. Pseudomalachite and plumbogummite - new minerals for Bulgaria. Crystal chemistry and systematics of the sulfosalt minerals. www.clmc.bas.bg /minsoc/InMemoriam/I_Kostov/I_Kostov.htm   (2745 words)

NovaGold Resources Inc. - Related Articles - Alaska's Mineral Industry 1999 Special Report 54 - Sat Jul 1, 2006   (Site not responding. Last check: 2007-10-11) Consolidated Aston believes that the pattern of mineralization is consistent with a leakage halo emanating from a down-dip mineralized source along the main structural trend. The upper part of the mineralized system consists of vuggy silica with open spaces lined by comb quartz; 300-400 feet lower in the system, silicification is characterized by stockwork veinlets and quartz flooding as a dense matrix. Two new areas of bedrock zinc mineralization were discovered: a mineralized carbonate breccia that assayed 3.6 percent zinc and 0.2 percent lead, and a gossanous area with up to 3.18 percent zinc. www.novagold.net /s/RelatedArticles.asp?ReportID=19781&_Title=Alaskas-Mineral-Industry-1999-Special-Report-54   (3972 words)

Resident Geologist Program-Monthly Report Despite the presence of a deposit and a number of significant mineral occurrences, exploration has been limited to the main deposit area or roughly 2% of the current Pelangio holdings. As a result, a modern state-of-the-art airborne survey was initiated to further evaluate the extent of known zones of mineralization proximal to the South Zone, as well as the entire favourable stratigraphic package that stretches across the current property. The Regional Resident Geologist (RRG) was contacted regarding the location of a past producing fluorite mine by a descendant of a miner killed in an accident at the mine in Huntington Township in 1944. www.mndm.gov.on.ca /mndm/mines/resgeol/southern/southeastern/reports/2004/february_e.asp   (661 words)

Alan Guisewite's Mineral Collection Images: Miscellaneous Systematic Sulfides Page A handsome small cabinet specimen of silvery-fl freibergite (a silver copper iron sulfosalt) with azurite in a quartz-andesite breccia from (probably) the Cerro Colorado Mine, Pima County, Arizona. One of the few thallium-containing minerals, pierrotite (a thallium sulfosalt) occurs as grayish-fl masses in this miniature from the type locality of Jas Roux, Hautes Alps, Côte d'Azur, France. Siegenite's a rare nickel cobalt sulfide - this large thumbnail (with a dolomite matrix) is from the Sweetwater Mine, Reynolds County, Missouri. www.cs.cmu.edu /People/adg/adg-pssuiimages.html   (5728 words)

EMPLECTITE (Copper Bismuth Sulfide) Emplectite is a another interesting sulfosalt mineral; a unique and diverse group of minerals to collect. But this theory of formation for the sulfosalts is not supported by crystallographic studies, yet the name sulfosalts is still used. Unfortunately emplectite is a difficult mineral to distinguish from other gray, acicular to massive, dense sulfosalts with a fl streak. www.galleries.com /minerals/sulfides/emplecti/emplecti.htm   (300 words)

Gold from the McLaughlin Mine Minerals that form in a hot springs-type epithermal system are often very fine-grained, because a crystal's size is often controlled by the len Silver sulfosalt minerals such as pyrargryrite and myargyrite also frequently accompany gold dendrites. In zones where the mudstone was hardened due to silicification, the responsible mineral was found to be the potassium feldspar, adularia. nrs.ucdavis.edu /McLaughlin/naturalhis/gold/gold1.htm   (518 words)

NMBGMR -   (Site not responding. Last check: 2007-10-11) Miner's tales often speak of "silver-bearing" galena in the octahedral form or in distorted forms - this has not been observed in my studies. Magnetite minerals occurring in domestic water supplies was brought to my attention while I was at Tarleton State University in Texas. Since these minerals are important in many ore deposits, I have made understanding their chemical components one of my vocations. geoinfo.nmt.edu /staff/lueth/research.html   (3629 words)

Try your search on: Qwika (all wikis)

About us   |   Why use us?   |   Reviews   |   Press   |   Contact us   Copyright © 2005-2007 www.factbites.com Usage implies agreement with terms.