clinozoisite


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clinozoisite

[¦klī·nə′zō·i‚sīt]
(mineralogy)
Ca2 Al3(SiO4)3(OH) A grayish-white, pink, or green monoclinic mineral of the epidote group.
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Eclogites mainly consist of garnet, omphacitic clinopyroxene and symplectite with minor rutile and epidote group minerals (including zoisite, clinozoisite and epidote).
At low temperature (<200[degrees]C), Na-Ca-bearing zeolites, trioctahedral (Ca)-Mg-Fe-bearing smectites, and calcite were stable, whereas at high temperature (>200[degrees]C), these minerals were replaced by chlorite-(Mg-Fe), albite, quartz, and Ca-bearing aluminosilicates, including epidote, wairakite, prehnite, and clinozoisite. Trioctahedral (Ca)-Mg-Fe-bearing smectites were replaced by chlorite-(Mg-Fe) at high temperature, illustrating a competition for Mg and Fe between these minerals.
Epidote (1.3-1.7%) wasasubhedral grains; optical studies identified both zoisite and clinozoisite. Interstitial and fine grains of muscovite were also identified.
In addition, rare tails of chlorite and clinozoisite have grown parallel to [S.sub.2] off pyrite, siderite, and siliceous nodules.
Around 50 thousand tonnes of tungsten ore deposits have been estimated recently which occur in 300 km long belt main scheelite mineralization occurs, in the Mineki Gole and adjoining area, consisting of mica schist, carbonates, clinozoisite, calc-silicate quartzite, tourmaline, phyllite and feldspar rocks (Khan et ah, 2003).
A crystal showing this habit has been positively identified by Raman analysis as zoisite rather than clinozoisite (Downs, 2006).
It is composed of feldspar (45.5%), quartz (25%), biotite (18%) and muscovite (4%); titanite (1.5%), zircon (0.5%), clinozoisite (1.5%), epidote (0.5%) and apatite (1%) are the accessories.
There are a variety of different types: clinozoisite-rich rock fragments, epidote-biotite quartz schist, amphibole-biotite-clinozoisite-quartz schist, biotite-clinozoisite-quartz schist, clinozoisite-biotite-opaques-quartz schist, biotite-rich rock fragments, amphibole-biotite-opaques-clinozoisite-quartz-titanite rock fragment, chlorite or anthophyllite-biotite schist (some possibly with accessory tourmaline?), chlorite biotite schist, clinozoisite feldspar rock fragment, altered feldspar-titanite-biotite replaced amphibole-clinozoisite rock fragment, amphibole-rich rock fragments, and garnet-banded biotite quartz rock fragment.
32-0151), and clinozoisite [Ca.sub.2] [Al.sub.3](Si[O.sub.4])([Si.sub.2][O.sub.7])O(OH) (PDF pattern no.
These mineral species described are: Hornblende, Epidote, Piemontite, Chabazite, Prehnite, Pyrite, Chalcopyrite, Clinozoisite, Dravite var Tourmaline, Chlorite, Garnet var Almandine, Sulphur (as free crystals), Calcite, Kaolinite, Hyalite Opal.