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Topic: Augite


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  augite.htm
Augite is common in gabbroic and ultramafic rocks.
IRON COUNTY: Augite is an abundant component of the gabbroic rocks of the Keweenawan Mellen Complex, well-exposed at a number of places in the county.
Augite occurs in troctolite in the SW SW sec.
www.uwrf.edu /~wc01/augite.htm   (969 words)

  
 Dolerite - LoveToKnow 1911
The commonest type of structure in dolerite is the ophitic, which results from the felspar of the rock having crystallized before the augite; the latter mineral forms shapeless masses in which the idiomorphic felspars lie.
The augite enclosing the felspars is well crystallized, though its continuity is interrupted more or less completely by the numerous crystals of felspar which it envelops, and in polarized light the former often behaves as a single individual over a considerable area, while the latter mineral consists of independent crystals.
Some contain larger individuals of pale green, rather pleochroic augite (the so-called sahlite), and a little brown mica, and brownish-green hornblende may also be present.
www.1911encyclopedia.org /Dolerite   (785 words)

  
 Augite - Wikipedia, the free encyclopedia
Augite is a solid solution in the pyroxene group.
The magnesium content of augite is limited by a miscibility gap between it and pigeonite and orthopyroxene: when occurring with either of these other pyroxenes, the magnesium content of augite is a function of temperature and pressure, but mostly of temperature, and so can be useful in reconstructing temperature histories of rocks.
There is also a miscibility gap between augite and omphacite, but this gap occurs at lower temperature and is not well understood.
en.wikipedia.org /wiki/Augite   (270 words)

  
 Hourglass structure in augite
In thin section and in transmitted light, the augite free of exsolution is clear and transparent whereas with exsolution the grain is translucent and clouded by a fine parting which masks the otherwise prominent cleavage.
Parallel growth between augite and pigeonite is of common occurrence throughout the dolerites and pegmatites of this Tertiary dike.
In many instances the augite completely encloses a core of altered pigeonite and a later development of pigeonite occurs as an interrupted rim near the margin of the composite grain.
www.minsocam.org /msa/collectors_corner/arc/augite.htm   (1901 words)

  
 Olympus Microscopy Resource Center: Mortimer Abramowitz Gallery of Photomicrography - Augite Polished Section
Augite is a dark mineral important in the formation of igneous rocks that is most frequently found in basalts, dolerites, and gabbros.
Often prismatic in shape, augite may consist of rectangular or octagonal cross sections and is typically dark green to fl in color.
Augite falls in the middle range, exhibiting a relative hardness between five and six, which indicates that it can scratch apatite, number five on the Mohs scale, but is itself scratched by orthoclase, which ranks sixth.
www.olympusmicro.com /galleries/abramowitz/pages/augitsmall.html   (194 words)

  
 AUGITE (Calcium Sodium Magnesium Iron Aluminum Silicate)
Augite is an important rock-forming mineral in many igneous rocks, especially in gabbros and basalts, and is also found in some hydrothermal metamorphic rocks.
Augite is a part of an important solid solution series of the pyroxene group.
Mineral specimens of augite, while ordinarily unattractive and not very interesting, can have some specimens that are very striking in appearance and are of interest to many mineral collectors.
mineral.galleries.com /minerals/silicate/augite/augite.htm   (286 words)

  
 Minerology of Illimaussaq
The main rock types of the complex are nepheline-bearing augite syenite, quartz-bearing alkali granite and nepheline-bearing syenitic rocks (agpaitic rocks named naujaite, sodalithe foyaite, lujavrite and kakortokite).
The augite syenite consists of alkali feldspar, olivin, clinopyroxene, amphibole, biotite, nepheline, apatite and magnetite.
This shell is between 10 and 500 m thick and it is commonly separated from the inner agpaitic rocks by an agpaitic border pegmatite.
www.minershop.com /html/minerology.html   (1125 words)

  
 Augite Information Center - augite composition
Augite augite is a mafic how is augite formed mineral described chemically augite minerals as (Ca, Na)(Mg, Fe, Al)(Al, pyroxene var.
It is found in igneous rocks such as gabbros and basalts, and in metamorphic rocks from hydrothermal vents.
Occasional specimens have a shiny appearance that give rise to the mineral's name, which is from the Greek augites, meaning "brightness", augite mineral although ordinary specimens augite composition have a dull (dark green, brown or fl) finish.
www.scipeeps.com /Sci-Chemistry_Topics_Ap_-_B/Augite.html   (138 words)

  
 Augite   (Site not responding. Last check: 2007-10-20)
Augite is a silicate with composition (Ca, Mg,Fe)
Augite is a basic silicate mineral with high content of iron and magnesium, a so-called "ferromagnesian" mineral of the pyroxene grouping.
Augite is often found as crystals in basalt.
hyperphysics.phy-astr.gsu.edu /hbase/minerals/augite.html   (78 words)

  
 Augite
Augite is an important rock-forming mineral in many igneous rocks, especially in gabbros and basalts, and...
Augite is a mafic mineral described chemically as (Ca, Na)(Mg, Fe, Al)(Al, Si)2O6 or calcium sodium magnesium iron aluminium silicate.
Cumulate phases are plagioclase, olivine, augite, ferrobustamite(?), oxides, and apatite...
www.toprocks.net /MineralList/6/Augite.asp   (320 words)

  
 Calcic Clinopyroxene
Augite, the most common clinopyroxene, is found in mafic to intermediate igneous rocks and their metamorphic equivalents.
In the XP view the augite has up to mid second order interference colors and the plagioclase shows twinning in first order fl-gray-white interference colors.
The augite shows cleavage, and the angle between cleavages appears to be close to 90
www.und.nodak.edu /instruct/mineral/320petrology/opticalmin/cpx.htm   (792 words)

  
 Augite - LoveToKnow 1911   (Site not responding. Last check: 2007-10-20)
Such crystals, of short prismatic habit and fl in colour, are common as phenocrysts in many basalts, and are hence known as " basaltic augite ": when the containing rock weathers to a clayey material the augite is left as fl isolated crystals, and such specimens, usually from Bohemia, are represented in all mineral collections.
It also occurs in metamorphic rocks; for example, in the crystalline limestones of the Fassathal in Tirol, where the variety known as fassaite is found as pistachio-green crystals resembling epidote in appearance.
Variations in the amount of iron in mixtures of these isomorphous molecules are accompanied by variations in the optical characters of the augite.
www.1911ency.org /A/AU/AUGITE.htm   (294 words)

  
 augite | | Dictionary & Translation by Babylon
Sommige exemplaren hebben een bijzondere schittering, waar de naam vandaan komt (Grieks: augites betekent "helderheid"), hoewel normaalgesproken de kristallen een doffe (donker groene, bruine of zwarte) glans hebben.
augite.] a variety of pyroxene, usually of a fl or dark green color, occurring in igneous rocks, such as basalt; -- also used instead of the general term pyroxene.
augite to English augite to French augite to Italian augite to Dutch augite to Portuguese augite to German augite to Russian augite to Japanese augite to Chinese (S) augite to Turkish augite to Hebrew augite to Thai augite to Czech augite to Romanian
www.babylon.com /definition/augite/All   (346 words)

  
 Augite
Augite is a ferro-magnesian mineral belonging to the pyroxene group.
Augite is the commonest pyroxene and occurring widely in igneous rocks.
It is dark green to fl, although weathered specimens may look faded.
www.es.ucl.ac.uk /schools/Glossary/augite.htm   (135 words)

  
 Abstracts. MAPS vol 40, issue 11, 2005.
The YIM crystallized to form the augite rims, the olivine rims and the mesostasis phases in the cumulates.
Glass inclusions occur in close association with titanomagnetite and ferroan augite halo in phenocryst core augites and the assemblages may be magmatic inclusions in augites.
The composition of magmatic inclusions in augite is similar to the YIM.
meteoritics.org /Abst_40-11.htm   (3104 words)

  
 Augite
Augite is a greenish-fl mineral that is found in many igneous rocks.
It is found in many basic and ultra-basic igneous rocks such as gabbro and basalt.
Augite has a hardness of 5-6.5 with a vitreous luster and a prismatic cleavage.
volcano.und.nodak.edu /vwdocs/vwlessons/lessons/Slideshow/Show1/Show1-4.html   (41 words)

  
 AUGITE - Online Information article about AUGITE
The name (from ai)al, lustre) has at various times been used in different senses; it is now applied to aluminous pyroxenes of the See also:
common as phenocrysts in many basalts, and are hence known as " basaltic augite ": when the containing rock weathers to a clayey material the augite is See also:
Though typical of basaltic rocks, augite is also an important constituent of many other kinds of igneous rocks, and a rock composed almost wholly of augite is known as augitite.
encyclopedia.jrank.org /AUD_BAI/AUGITE.html   (441 words)

  
 Pigeonite - Wikipedia, the free encyclopedia
Polarized light microscope image of part of a grain of orthopyroxene containing exsolution lamellae of augite (long dimension 0.5 mm, Bushveld igneous complex).
The texture documents a multistage history: (1) crystallization of twinned pigeonite, followed by exsolution of augite; (2) breakdown of pigeonite to orthopyroxene plus augite; (3) exsolution of augite parallel to the former twin plane of pigeonite.
Pigeonite crystallizes in the monoclinic system, as does augite, and a miscibility gap exists between the two minerals.
en.wikipedia.org /wiki/Pigeonite   (212 words)

  
 Untitled Document
We chose to study melt inclusions trapped within augite because augite reequilibrates with the external melt to a lesser extent than does olivine, which often shows open-system behavior with respect to Fe-Mg exchange.
In all models, olivine and augite co-crystallize from the estimated parental melt composition, consistent with subsolidus re-equilibration of olivine.
In particular, melt inclusions within Nakhla augite demonstrate that Nakhla is a volcanic rock whose parent melt composition and crystallization history reflect planetary igneous processes.
web.utk.edu /~pgi/personnel/stockstill.html   (2007 words)

  
 Re: how augite is mined
From what I can glean, the mining of augite is more or less in two forms.
For the massive type, quarrying is the common method, with the main objective being such items as crushed rock for building and roadbeds, or block-type building stone.
While I have not seen many specimens of augite proper on the mineral market, its close cousin diopside (especially the deep green chromian variety) is reasonably often seen and some of the crystal groups are breathtakingly beautiful.
www.madsci.org /posts/archives/2000-12/976206566.Es.r.html   (308 words)

  
 [No title]   (Site not responding. Last check: 2007-10-20)
Diopside and hedenbergite form a complete solid solution series with physical and optical properties varying linearly with composition.
Augite is a clinopyroxene in which some Na substitutes for Ca, some Al substitutes for both Mg (or Fe) and Si, and in which Fe and Mg contents are higher than in diopside or hedenbergite.
Sample is augite plus a moderate amount of dolomite.
speclab.cr.usgs.gov /spectral.lib04/DESCRIPT/augite.NMNH120049.html   (276 words)

  
 Pyroxenes
Figure 5.14: Laboratory spectra of augite pyroxenes; the x-axis is wavelength in µm, the y-axis is the normalised extinction K.
The ferromagnesian orthopyroxene contained only iron and magnesium cations (as the name suggests), whereas the augite pyroxenes also contain other cations.
5.12a-c), which is not unexpected given the small amounts of calcium and aluminium present in the amorphous augite sample relative to the amounts of magnesium and iron.
www.missouri.edu /~speckan/witch-stuff/Research/chapter5/node5.html   (686 words)

  
 Augite   (Site not responding. Last check: 2007-10-20)
LUSTER Augite is vitreous to subvitreous and dull, it may also be resinous.
OCCURRENCE Augite is an important rock forming mineral in mafic and ultramafic igneous rocks.
It is also found in high temperature metamorphic rocks.
www.gc.maricopa.edu /earthsci/imagearchive/augite.htm   (93 words)

  
 Augite Mineral Data
Comments: Clear, dark gray augite prisms in matrix.
Comments: Gray irregular grain of calzirtite (see arrow) in fibrous augite with dark red richterite.
Comments: Translucent tuscanite microcrystal in in vug in low-Fe augite (var.
webmineral.com /data/Augite.shtml   (347 words)

  
 Igneous Rocks
Latite [Andesine, sanidine, augite, amphibole, quartz, biotite, magnetite, hematite, apatite]
Syenite [Feldspar, quartz, biotite, mica, hornblende, augite, nepheline]
Trachyte [Feldspar, nepheline, quartz, mica, aegirine, augite, hornblende]
www.innvista.com /science/earth/geology/igneous.htm   (349 words)

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