Mineral ID Distinguishing Properties_2006

Mineral ID Distinguishing Properties_2006 - PHYSICAL...

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PHYSICAL GEOLOGY MINERAL IDENTIFICATION HELP SHEET (You must be able to identify the underlined minerals for the lab quiz) MINERAL NAME DISTINGUISHING PROPERTIES Quartz Hexagonal crystals Conchoidal Fracture Hardness greater than glass (H=7 on Moh’s scale) Plagioclase Feldspar 2 cleavages at about 90° Striations (twinning) present Potassium Feldspar 2 cleavages at about 90° Striations not present Augite (pyroxene) Usually dark green 2 cleavages at about 90° (87°/93°) Hornblende (amphibole) Usually black or dark green 2 cleavages at 60°/120° (56°/124°) Olivine Olive green color Granular Conchoidal fracture Hardness greater than glass (H ~ 6.5 – 7) Garnet 12-sided (dodecahedral) crystals common Hardness greater than glass (H~6.5 – 7) Biotite 1 perfect cleavage D a r k b r o w n c o l o r Muscovite 1 perfect cleavage Colorless or silvery appearance Chlorite Dark green color Green to blackish streak Talc Very soft (H = 1 on Moh’s scale) G r e a s y f e e l Kaolinite Usually bright white
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Mineral ID Distinguishing Properties_2006 - PHYSICAL...

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