lecture 2 416k - Drusy quartz SiO2 COLUMNAR COLUMNAR Naica...

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Magnetite Fe3O4 from Africa
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Fluorite CaF2 from New Orleans
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Fig. 2.4
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Tourmaline
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Quartz SiO2
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Quartz SiO2
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Quartz SiO2
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Quartz scepter From Madagascar
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Smoky Quartz
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Brazilian green epidote
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Quartz twins
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Rutile twins TiO2
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Gypsum from the Great Salt Plains (OK) CaSO4·2H2O
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StauroliteFe2Al9Si4O22(OH)2
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Staurolite twins
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Fig. 2.7
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Polysynthetic twinning in plagioclase
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ACICULAR (millerite) like a needle
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Capillary tubes
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Hematite- iron ore= capillary
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Riebeckite = like hair Na2(Fe, Mg)3Fe2Si8O22(OH)2 filiform
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Amosite Fe7Si8O22(OH) 2
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Bladed= like knife blades
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BLADED (strengite) FePO4.2H2O
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Unformatted text preview: Drusy quartz SiO2 COLUMNAR COLUMNAR Naica Mine, Chihuahua Mexico. Selenite crystals (gypsum CaSO4) COLUMNAR Tourmaline (Ca,K,Na)(Al,Fe,Li,Mg,Mn)3(Al,Cr, Fe,V)6 (BO3)3(Si,Al,B)6O18(OH,F)4 Columnar and Bladed calcite FIBROUS (gypsum) FIBROUS (orthochrysotile=asbestos) Stellated radiating individuals forming star-like, circular groups Gelndonite= form of CaCO3 GLOBULAR (azurite) COLLOFORM GLOBULAR (wavelite) COLLOFORM BOTRYOIDAL= like grapes Wavelite from Arkansas Malachite BOTRYOIDAL (hematite) COLLOFORM MAMMILLARY OR BOTRYOIDAL (malachite) COLLOFORM RENIFORM= like kidney RENIFORM (atacamite) COLLOFORM LAMELLAR FOLIATED MICACEOUS (phlogopite) Plumose= like feathers Celestite SrSO4 MASSIVE (sheelite) GRANULAR (olivine) STALATIC (calcite) CONCENTRIC (malachite) OOLITIC (hematite) PISOLITIC (bauxite) BANDED (hematite) GEODE (agate) CONCERTIONARY...
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lecture 2 416k - Drusy quartz SiO2 COLUMNAR COLUMNAR Naica...

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