Geo Identification - Minerals o Metallic Graphite (1) marks...

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Minerals o Metallic Graphite (1) – marks paper like a pencil Pyrite (6) – “fools gold”. Black streak Magnetite (6) – magnetic Galena (2.5) – cubic crystals, very dense, cubic cleavage o Vitreous Quartz (7) – crystals are 6-sided figures Orthoclase feldspar (6, K) – will scratch glass Plagioclase feldspar (6, Na, Ca) – will scratch glass Biotite mica (2.5) – peels into this, elastic, greenish-brown sheets Gypsum (2) – colorless (white streak). May occur as large, sword- like crystals Olivine (6.5-7) – olive green. Conchoidal fracture Calcite (3) – colorless/white (white streak) Muscovite mica (2.5) – peels into this, elastic, transparent sheets Halite, NaCl (2.5) – dissolves in water Hornblende (6) – barely scratches glass, generally massive Augite (6) – opaque prismatic crystals Talc (1) – feels soapy, extremely soft Garnet (7-7.5) – dodecahedral crystals o Earthy Hematite (5) – red-brown streak
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This note was uploaded on 02/25/2011 for the course GEO 303 taught by Professor Leon during the Spring '08 term at University of Texas at Austin.

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Geo Identification - Minerals o Metallic Graphite (1) marks...

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