HCCS-NORTHWEST
COLLEGE
PHYSICAL GEOLOGY 1403
MINERALS
GALENA
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PbS LEAD ORE
METALLIC LUSTER
CUBIC CLEAVAGE
GREY BLACK
STREAK
• SOFTER GLASS
• HIGH SPECIFIC
GRAVITY
LIMONITE
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Fe2O3 IRON ORE
NONMETALLIC LUSTER
FRACTURE
BROWN STREAK
SOFTER GLASS
HEMATITE
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Fe2O3 IRON ORE
METALLIC LUSTER
FRACTURE
RED-BROWN
STREAK
• HARDER GLASS
MAGNETITE
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Fe3O4 IRON ORE
METALLIC LUSTER
FRACTURE
BLACK STREAK
SLIGHTLY
HARDER GLASS
• MAGNETIC
PYRITE
• FeS2 SULFUR
COMP
• METALLIC LUSTER
• FRACTURE
• BLACK STREAK
• HARDER GLASS
FLUORITE
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CaF2 FLUX
NONMETALLIC LUSTER
CLEAVAGE
PURPLE COLOR
MOHS HARDNESS - 4
GYPSUM
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CaSO4 SHEETROCK
NONMETALLIC LUSTER
PERFECT CLEAVAGE
WHITE - TRANSLUCENT
MOHS HARDNESS - 2
HALITE
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NaCl TABLE SALT
NONMETALLIC LUSTER
PERFECT CLEAVAGE
WHITE TRANSPARENT
• SOFTER GLASS
TALC
• Mg SILICATE
• NONMETALLIC
LUSTER
• POOR CLEAVAGE
• WHITE COLOR
• GREASY FEEL
• MOHS HARDNESS - 1
QUARTZ
• SiO2 SILICA OXIDE
• NONMETALLIC LUSTER
• CONCHOIDAL
FRACTURE
• WHITE, PINK, PURPLE
• MOHS HARDNESS - 7
K-FELDSPAR &
PLAGIOCLASE
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SILICATE MINERALS
NONMETALLIC LUSTER
GOOD CLEAVAGE
K-FELDSPAR - PINK
PLAGIOCLASE - WHITE
MOHS HARDNESS - 6
BIOTITE & MUSCOVITE
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MICA SILICATE FAMILY
NONMETALLIC LUSTER
PERFECT CLEAVAGE
BIOTITE - GLASSY BLACK
MUSCOVITE TRANSLUCENT
• SOFTER GLASS
CALCITE
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CaCO3 LIME
NONMETALLIC LUSTER
PERFECT CLEAVAGE
WHITE, YELLOW,
TRANSPARENT
• MOHS HARDNESS - 3
CLAY
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Al SILICATE
NONMETALLIC LUSTER
MICRO CLEAVAGE
ABSORBS ORGANICS
EARTHY ODOR
SOFTER GLASS
ASBESTOS
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Mg SILICATE
NONMETALLIC LUSTER
FIBROUS CLEAVAGE
LUNG CANCER
SOFTER GLASS