Quartz (crystal form, concoidal fracture, harder than glass) Plagioclase feldspar (2 planes cleavage ~90°, striations, elongate, transluscence, pleochroism) Potassium feldspar (2 planes cleavage ~90°, opaque, blocky, pink?) Muscovite (colorless – silver, 1 plane of cleavage, scratch with fingernail) Biotite (black, 1 plane of cleavage, scratch with fingernail) Augite (pyroxene, 2 planes of cleavage 90°, black­, dark green, blocky) Hornblende (amphibole, 2 planes of cleavage ~60° & ~120°, black, elongate) Garnet (crystal form, various colors, harder than glass, no cleavage) Olivine (dark to light green, harder than glass, no cleavage) Kaolinite (scratch with fingernail, white to gray, massive, "clay" feel) Fluorite (various colors, 4 planes of cleavage, softer than glass) Magnetite (magnetic, black ­gray streak, color, iron) Hematite (red-­brown streak, metallic and non­metallic luster, various forms, iron) Limonite (color, hardness, streak, iron) Pyrite (gold-brass, black streak, no cleavage) Galena (heavy, lead color, 3 planes of cleavage 90°) Corundum (hardness of 9, barrel shape crystal form, parting planes not cleavage) Calcite (CaCO3, 2 planes of cleavage not at right angles, effervescence, softer than glass) Halite (rock salt, clear to white, 3 planes of cleavage 90°) Gypsum (pink to white, opaque to clear, 1 good and 2 poor planes of cleavage, scratch with fingernail)

Quartz (crystal form, concoidal fracture, harder than glass) Plagioclase feldspar (2 planes cleavage ~90°, striations, elongate, transluscence, pleochroism) Potassium feldspar (2 planes cleavage ~90°, opaque, blocky, pink?) Muscovite (colorless – silver, 1 plane of cleavage, scratch with fingernail) Biotite (black, 1 plane of cleavage, scratch with fingernail) Augite (pyroxene, 2 planes of cleavage 90°, black­, dark green, blocky) Hornblende (amphibole, 2 planes of cleavage ~60° & ~120°, black, elongate) Garnet (crystal form, various colors, harder than glass, no cleavage) Olivine (dark to light green, harder than glass, no cleavage) Kaolinite (scratch with fingernail, white to gray, massive, "clay" feel)

Fluorite (various colors, 4 planes of cleavage, softer than glass) Magnetite (magnetic, black ­gray streak, color, iron) Hematite (red-­brown streak, metallic and non­metallic luster, various forms, iron) Limonite (color, hardness, streak, iron) Pyrite (gold-brass, black streak, no cleavage) Galena (heavy, lead color, 3 planes of cleavage 90°) Corundum (hardness of 9, barrel shape crystal form, parting planes not cleavage) Calcite (CaCO3, 2 planes of cleavage not at right angles, effervescence, softer than glass) Halite (rock salt, clear to white, 3 planes of cleavage 90°) Gypsum (pink to white, opaque to clear, 1 good and 2 poor planes of cleavage, scratch with fingernail)