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Sericite - Wikipedia, the free encyclopedia Sericite is a fine grained mica, either muscovite, illite, or paragonite. Sericite is a common alteration mineral of orthoclase or plagioclase feldspars in areas that have been subjected to hydrothermal alteration typically associated with copper, tin, or other hydrothermal ore deposits. Sericite also occurs as the fine mica that gives the sheen to phyllite and schistose metamorphic rocks. en.wikipedia.org /wiki/Sericite   (149 words)

Olympus Microscopy Resource Center: Polarized Light Microscopy Gallery - Sericite Sericite typically occurs as aggregates of tiny flakes and exhibits a silky sheen, which it imparts to the rocks that it is found in. The paragonite sericite is found in similar locations, but was formerly believed to be much less common than the muscovite form. Many geologists now suppose that many instances of paragonite were mistakenly identified as muscovite because both are light colored micas and a determination between the two cannot usually be made without establishing their potassium to sodium ratios. www.olympusmicro.com /galleries/polarizedlight/pages/sericitesmall.html   (188 words)

Medinah Minerals, Inc. - Vancouver Petrographic 10.6.00 Report Cores of the pseudomorphs tend to be chlorite and minor sericite; rims tend to be carbonate. Sericite (and ?clay) altered plagioclase sites have subhedral outlines up to 0.5 cm long that are pseudomorphed by 10-20 micron flakes. Sericite flakes are rarely up to 35 microns in diameter, mixed in places with a very pale greenish or brownish chlorite of similar size. www.medinah-minerals.com /reports/petrographic_11-6-00.html   (7362 words)

6-km Vertical Cross Section Through Porphyry Copper Deposits, Yerington District, Nevada: Multiple Intrusions, Fluids, ... Youngest sericitic alteration, consisting of sericite-quartz with 2 to 10 vol % pyrite, formed as well-defined halos on through-going pyritic fractures and pebble breccias with steep Jurassic dips. The volume of sericitic alteration expands upward from 1-2% of the rock in potassic ore zones at 2-3 km depths to ~50% of exposures at 1 km paleodepth. Sericitic alteration is pervasive in the upper part of the section in many areas of the Buckskin. pangea.stanford.edu /research/ODEX/marco-yerington.html   (2888 words)

Albite Information Center - albite sericite alteration plot The composition of plagioclase albite sericite alteration plot feldspar is typically determined by the percentage of anorthite (%An) in system. The members of this series are known uses of albite as the sodic-lime feldspars, and as a group are called the plagioclase feldspars, which comes from Greek meaning "oblique fracture" in reference to the two not-quite-right-angle cleavages. Sunstone is mainly oligoclase (sometimes albite) albite sericite tie line with flakes of hematite. www.scipeeps.com /Sci-Chemistry_Topics_A_-_An/Albite.html   (402 words)

Figure F36. Photomicrographs illustrating complex multistage evolution of BAG during deformation and metamorphism. ...   (Site not responding. Last check: 2007-10-29) The original polysynthetic twinning of the plagioclase porphyroclasts (white arrows) is pseudomorphed by sericite with different orientations. The secondary fibrous amphibole (a2), sericite (sc), and chlorite (ch) are stretched and banded, defining the schistosity (image 1271B_048). The matrix is composed of fine fibrous aggregates of secondary amphibole (a2) and chlorite (a2) (may by replacing former high-temperature amphibole) alternating with dark bands of sericite and hydrogrossular (sc and hgr) (may by replacing former plagioclase) (Sample 209-1271B-11R-1, 55–57 cm) (plane-polarized light: blue + dark gray filters; FOV = 5.5 mm; image 1271B_053). www-odp.tamu.edu /publications/209_IR/chap_01/c1_f36.htm   (421 words)

Potrerillos 40Ar/39Ar Sample Descriptions and Locations Sericite is present as a vein-filling mineral and as a distinct selvedge to the vein. Coarse-grained sericite replacing phlogopitic vein biotite where vein biotite is cut by pyrite-chalcopyrite veinlets. Sericite present as coalescing envelopes around through-going pyriteñchalcopyrite veinlets cutting granodiorite porphyry. pangea.stanford.edu /research/ODEX/tim/appenda.htm   (719 words)

Meta-rhyolite tuff The phenocrysts are clouded and have partly altered to sericite. They range in size from 1 to 3mm and have an An content between 22 and 27.Slight normal zoning was measured as 1 to 2% difference between the core and the rim. The remainder of this rock is composed of a heterogenous mosaic of quartz, alkali feldspar, sericite, and biotite. www.angelfire.com /extreme4/lkrwork/x50.htm   (423 words)

Hydrothermal Veins and Alteration Sericite is a common alteration mineral formed in zones along fault structures or fault zones in low to moderate temperature settings. Sericitic: (Sericite) Sericitic alteration alters the rock to the mineral sericite, which is a very fine-grained white mica. Proximal portions of the veins are characterized by advanced argillic alteration adjacent to the vein which is superceded outwards by sericitic alteration. www.dmtcalaska.org /course_dev/explogeo/class08/notes08.html   (2250 words)

Kouvervaara   (Site not responding. Last check: 2007-10-29) By GTK: following a discovery of U-rich sericite quartzite boulders in 1978 (by Outokumpu), ground geophysical surveys located an electric anomaly, and trenching and drilling trough the overburden within the anomaly hit the deposit in the bedrock [2,6,8,9,10,11,12,13,16]. Outer proximal: actinolitic hornblende-almandine-biotite-quartz-chlorite-sulphides-magnetite ± sericite, rutile, dolomite, ilmenite [16]. Structurally controlled hydrothermal fluid pathways were created during post-depositional tectonic event(s) of regional scale which were related to the closure of the main rift during the Svecofennian (Svecokarelian) orogeny [2,3,4]. www.gsf.fi /explor/gold/kouvervaara.htm   (1247 words)

Natural mineral based powder cosmetics and skincare. SALE IN PROGRESS 20% OFF ENTIRE LINE! - Ingredients   (Site not responding. Last check: 2007-10-29) titanium dioxide, sericite, iron oxide, mica, kaolin and zinc oxide sericite, cornstarch, titanium dioxide, kaolin, zinc oxide, iron oxide, mica. cyclopentasiloxane, C30-45 alykl cetearyl dimethicone crosspolymer, dimethicone, titanium dioxide, sericite, iron oxide, mica, kaolin, vitamin E and zinc oxide. www.pureluxecosmetics.com /wst_page13.html   (277 words)

MYRMEKITE 16 OF 50 Throughout the pluton deformation and hydrothermal alteration have caused sericitization of biotite and the feldspars, and quartz grains are highly strained or have a mortar texture. Sericitization of the calcic cores of plagioclase is particularly common, if not universal in many places (Figs. Because of the greater volumes of sericite than the volumes of the original primary biotite and because of the relatively small amounts of Al per unit volume in the feldspar than in sericite, additional K and Al must have been introduced into the sheared rocks. www.csun.edu /~vcgeo005/skidoo.htm   (3122 words)

Pneumoconiosis after sericite inhalation -- Algranti et al. 62 (3): e2 -- Occupational and Environmental Medicine Sericite is a fine grained variety of white mica in the form sericite was thought to be one of the main causes of lung disease with sericite in lesions are conjunctive evidence for an occupational oem.bmj.com /cgi/content/full/62/3/e2   (3431 words)

[No title] 99Ð109." "biotite, chalcopyrite, chlorite, delafossite, epidote, gypsum, hematite, magnetite, malachite, molybdenite, pyrite, sericite" 7 20c (2) "dacite porphyry, monzonite porphyry" "andesite, granite, diorite porphyry, metasedimentary rocks, phyllite, sandstone, schist" 2.7 2 4.2 Bajo El Durazno AGTN Argentina Catamarca -17 -27 -34 -66 -66.56666667 -27.28333333 20c 1976 10% of the deposit area is covered by alluvium. " "chalcopyrite, chlorite, epidote, molybdenite, pyrite, sericite" "andesite, dacite, graywacke, sandstone, siltstone, tuff, volcanic breccia" Mt. " "chalcopyrite, chlorite, epidote, galena, molybdenite, pyrite, sericite, sphalerite " 285 "agglomerate, andesite, conglomerate, granite, quartzite, rhyolite, sandstone, siltstone" Mt. pubs.usgs.gov /of/2005/1060/PorCu.txt   (11169 words)

Fortes The Upper Ore Zone (UOZ) is represented by massive sulphide (arsenopyrite and/or pyrrhotite) within a sequence of marbles and quartz-chlorite-carbonate-sericite schists and is associated with pyrrhotite-magnetite-biotite-schists, chlorite-garnet schists, garnetites, sericite schists, sericite-chlorite schists and biotite marble. The alteration is manifested as silicification, sulfidization, sericitization, carbonatization and talcification, closely related to the mineralization. Two generations of arsenopyrite were characterized (UOZ and LOZ): aspy 1 (sulphur-rich, occurring in the center of the grains, with evidence of dissolution) and aspy 2 (arsenic-rich, occurring in the border of the grains, and to which gold is preferably associated). www.geology.wisc.edu /~pbrown/fi/pac6/fortes.html   (728 words)

Anupma Prakash: Fieldwork - Balaghat, India The gneisses are overlain by a more conglomeratic and pebbly grit formation with minor amount of quartz-sericite and muscovite-sericite schist, which is designated as Sitasoangi stage. The manganese ore bed occupies a stratigraphic horizon between the conglomerate and grit of the Sitasoangi formation and the phyllites and sericite schists of the overlying Mansar formation. The linear stretch of manganese ore from Bharwelli in the SW to Ukwa in the NE is mined by opencast and underground mining techniques, often in a rather primitive labour intensive way. www.gi.alaska.edu /~prakash/fieldwork/balaghat/index.html   (275 words)

Goldrea Resources Corp. - Free Market News Network The purpose of this sample is to determine the percentage of sericite in the sericite sulphide breccia and provide a correlative comparison of the recoverable gold in the typical sericite sulphide breccia. The bulk sample will be taken from a section of this sericite sulphide breccia material indicated to carry 1.5 gpt to 2.0 gpt gold and treated at the existing Daye Mine Mill and Sericite Recovery Plant. The results of this batch bulk sample will provide recovery and cost parameters which will be applied in the feasibility study for a mining operation on the remainder of the deposit. www.freemarketnews.com /Press-Release.asp?nid=706   (720 words)

Recipies   (Site not responding. Last check: 2007-10-29) To create a line of matte eye shadows or eyeliners, you need to start with a base of white matte mica titanium dioxide, zinc oxide, boron nitride or the sericite base, all available at Sweetscents. If you prefer not to mix your own colors, all of our minerals are available preblended, and ready to use soon as you get them by simply opening the minerals, and grabbing your mineral makeup brush and apply the minerals to your skin. Grind oxides into the Titanium Dioxide, Zinc Oxide, boron or sericite and white matte mica. www.sweetscents.com /descriptions.html   (3653 words)

[No title] Beds are disturbed near the intrusions.‰Light-gray, medium-grained, equigranular intrusive rock -- quartz, feldspar, biotite, amphibole; brownish weathering; local quartz veins.éBrown-weathering grit at top of Koipato, quartz, feldspar, sericite, cut by stockwork quartz veinlets, abundant iron oxides. Sericite-muscovite filled veinlet.CLargely recrystallized carbonate with some micrite, crudely bedded.GFoliation well developed and cut at 90 degrees by crenulation cleavage.UMicrocrystalline, largest fossil is a shell 5 mm long, pellets. Rock is pyritic, with minor to rare quartz veinlets. www.nbmg.unr.edu /staff/larrysamples.xls   (951 words)

Seismically constrained two Fine grained sericite deposits occur at the interface between Archean Mewar Gneiss Complex and the Proterozoic Aravalli Supergroup independent of shearing. The sericite schists are rich in sericite towards the top and contain chlorite towards the base. The sericite in these schists was formed by metasomatic alteration of kyanite and not from the feldspars of the basement granitoids and gneisses. www.ias.ac.in /jessci/mar2001/absmar2001.html   (1350 words)

Regional Metamorphism Some greenschist facies rocks are also exposed in structural windows within the central Blue Ridge Province. Chlorite, sericite, quartz, albite, magnetite, ±garnet (highest grade greenschist facies). Blueschist Facies - most of the rocks of the blueschist facies do not retain their original textures, and are now schistose. www.tulane.edu /~sanelson/geol212/regionalmetamorph.htm   (2430 words)

Mineral Cosmetic Powders Sericite mica reflects light, reducing the appearance of pores and wrinkles and provides a matte coverage. A bronzing powder that can be worn alone or over foundation to give the face a sun-kissed radiance with a touch of shimmer. A fine translucent powder with a touch of colour to set your make-up and give you a silky, iridescent finish. www.buyorganicskincare.com /site/1304246/page/481691   (311 words)

Mineral Powder Foundation Ingredients List Artemis: Sericite, Titanium Dioxide, Micronized Zinc Oxide, Iron Oxides. Miessence: Certified 100% Organic Foundation: Sericite mica, zinc oxide, organic rose (rosa damascena) otto. Sevi: Sericite (Mica) (CI 77019),, Titanium Dioxide (CI 77891), Zinc Oxide, Iron Oxides (CI 77499, CI 77491, CI 77492), Silica, Vegetable Lecithin, L-lysine. people.delphiforums.com /tracikenyon/IngredList22405.html   (1831 words)

l_weller.html   (Site not responding. Last check: 2007-10-29) One of the samples was microprobed to identify a fibrous mineral. From the shape it appears to have been fibrous sillimanite, but the original mineral has been replaced by sericite (fine grained white mica). We infer that sericite replaced fibrous sillimanite, and that the sillimanite indicates a metamorphic temperature of 540-570 C. I orientated the sericite and plotted the data on a rose diagram, which showed that there was a strong orientation parallel to the foliation in the quartzite, illustrating a Shape Preferred Orientation. www.geo.umn.edu /dept/programs/l_weller.html   (265 words)

MinTech International, Inc., attapulgite, mica, sericite and other minerals: News MinTech International, Inc., attapulgite, mica, sericite and other minerals: News The top particle size is 500 mesh (25 micron). Sericite, a special type of mica, is available in the range of 325 mesh to 1250 mesh. www.mtminerals.com /news.htm   (69 words)

Official Series Description - TATUM Series A--0 to 4 inches; brown (7.5YR 4/4) gravelly silt loam; weak moderately granular structure; very friable; many fine and medium roots, few coarse roots; 25 percent quartz pebbles and sericite schist channers, and 5 percent cobbles by volume; very strongly acid; clear wavy boundary. Bt2--13 to 31 inches; red (2.5YR 5/6) silty clay loam; moderate medium subangular blocky structure; firm; sticky; plastic; few fine roots; common distinct clay films on faces of peds; 5 percent quartz pebbles and sericite schist channers by volume; strongly acid; clear wavy boundary. Cr--54 to 62 inches; weathered, highly fractured sericite schist that can be dug with difficulty with a spade; strongly acid; abrupt smooth boundary. www2.ftw.nrcs.usda.gov /osd/dat/T/TATUM.html   (1518 words)

Southern Appalachian Geology: Mt. Carmel Gabbro Mt Carmel gabbro formed as a result of back-arc spreading, solidifying underground in a small magma chamber; 400-500 myo: Ordovician) Calhoun Creek: quartz and sericite (sericite is fine-grained mica, an alteration product of contact metamorphism); was ashflow tuff, intruded by basalt; mica was changed but quartz wasn’t Less quartz, darker soil as you go along the road, getting closer to contact; also vegetation change from scrub to grass www.usd.edu /~cmarek/appalachians/tuesday.html   (271 words)

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