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Mineral Identification Guide. Mineral. Shape. Color. Streak. Hardness. Magnetism. Optical. Properties. Chemical. Properties. Fluorescence. Biotite.
Typology: Slides
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Mineral Shape Color Streak Hardness Magnetism Optical Properties
Chemical Properties
Fluorescence
Biotite Thin sheets Dark Green, Brown, or Black
Colorless 2.5 - 3 None Transparent to Translucent
None None
Calcite
Rhombic Prism
Colorless or White
Colorless 3 None Transparent to Opaque
Reacts Fluorescent
Feldspar - Irregular
White, Pink, or Grey
Colorless 6 None Opaque None Fluorescent
Fluorite
Octohedral
Clear, Yellow, White, Purple, Blue
White 4 None Transparent to Translucent
None Sometimes Fluorescent
Galena Cubic Lead Grey Gray-Black 2.5 None Opaque None None
Granite Irregular White, Pink, Orange, Grey, or Black
White 2.0 - 7.0 None Opaque None None
Graphite Flaky Black, Silver, or Grey
Black 1.0 - 2.0 None Opaque None None
Hematite Irregular Red-Brown or Black
Red 5.5 - 6.6 None Translucent to Opaque
None None
Magnetite Irregular Black Black 6 Magnetic Opaque None None
Marble Cubic White or Grey White 3 None Opaque Reacts None
Muscovite Thin sheets Light Brown or Yellow
Colorless 2.0 - 2.5 None Transparent to Translucent
None None
Mineral Shape Color Streak Hardness Magnetism Optical Properties
Chemical Properties
Fluorescence
Obsidian Irregular Black, Blue, Gold
White 5.0 - 5.5 None Opaque None None
Pumice
Porous
White or Grey
White 2.0 - 7.0 None Opaque None None
Pyrite Cubes Brass-Yellow Black 6.0 - 6.5 None Opaque None None
Quartz Prism Colorless, Pink, or Purple
Colorless 7 None Transparent to Opaque
None None
Serpentin - Irregular
Green, Yellow, or Black
White to Grey
3.0 - 5.0 None Transparent to Opaque
None Sometimes Fluorescent
Schist (mica)
Irregular White or Grey^ White 2.0 - 5.0 None Opaque None None
Sodalite Irregular Blue, White, Pink, Grey, or Green
White 6 None Transparent to Translucent
None Fluorescent
Sulfur Irregular Yellow Yellow 1.5 - 2.5 None Translucent to Opaque
None None
Talc Irregular White, Green, or Pink
White 1 None Opaque None None
Tirodite Irregular Brown, Green, Pink, or Yellow
White 6.0 - 6.5 None Transparent to Translucent
None Fluorescent
Wernerite (scapolite)
Prismatic White, Grey, Brown, Pink, or Yellow
White 6 None Opaque None Fluorescent