Surface Color: Yellow-green, yellow-brown, red Form: Orthorhombic (3 unequal planes all at 90 o ) Streak: Colorless Luster: Vitreous (glassy) Hardness:

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Presentation transcript:

Surface Color: Yellow-green, yellow-brown, red Form: Orthorhombic (3 unequal planes all at 90 o ) Streak: Colorless Luster: Vitreous (glassy) Hardness: 6½ - 7 Cleavage: Poor in 2 directions at 90 o Fracture: Uneven conchodial Specific Gravity: 3.2 – 4.3

Surface Color: Pink, white, brown, gray, colorless Form: Triclinic (3 unequal planes NOT at 90 o ) Streak: White Luster: Vitreous (glassy) Hardness: 6 - 6½ Cleavage: Good in 2 directions at 90 o Fracture: Uneven Specific Gravity: 2.5 – 2.7

Surface Color: White, colorless, yellow, brown Form: Monoclinic (3 unequal planes 2 are at 90 o ) Streak: Colorless Luster: Vitreous, pearly Hardness: 2 - 2½ Cleavage: Perfect in 1 direction Fracture: Crumbles Specific Gravity: 2.7 – 3.0

Surface Color: Dark, lead gray Form: Cubic Streak: Dark, lead gray Luster: Metallic Hardness: 2½ Cleavage: Perfect in 3 directions at 90 o Fracture: Splinters Specific Gravity: 7.4 – 7.6

Surface Color: Colorless, white, gray, yellow, blue Form: Orthorhombic Streak: White Luster: Vitreous, dull Hardness: 3 Cleavage: Perfect in 3 directions at 90 o Fracture: Splinters Specific Gravity: 2.6 – 2.7

Surface Color: Green, brown, black Form: Monoclinic Streak: Colorless Luster: Submetallic, vitreous, pearly, waxy Hardness: Cleavage: Perfect in 2 directions (diamond shape) Fracture: Uneven splinters Specific Gravity: 3.0 – 3.4

Surface Color: White, colorless, gray, yellow, brown Form: Monoclinic Streak: White Luster: Vitreous, pearly Hardness: 1½ - 2 Cleavage: Perfect in 1 direction, distinct in other two Fracture: Splinters Specific Gravity: 2.3 – 2.4

Surface Color: White, apple-green Form: Monoclinic Streak: White Luster: Pearly, greasy Hardness: 1 Cleavage: Perfect in 1 direction Fracture: uneven (powder) Specific Gravity: 2.7 – 2.8

Surface Color: Steel-gray to iron-black Form: Hexagonal Streak: gray to black (shiny) Luster: Metallic Hardness: Cleavage: Perfect in 1 direction Fracture: Uneven Specific Gravity: 1.9 – 2.3

Surface Color: Steel-gray, reddish-brown Form: Hexagonal Streak: Red Luster: Metallic Hardness: Cleavage: None Fracture: Splinters Specific Gravity: 4.9 – 5.3

Surface Color: Violet, blue, green, yellow, brown… Form: Cubic Streak: White Luster: Vitreous Hardness: 4 Cleavage: Perfect in 4 directions Fracture: Uneven Specific Gravity: 3.0 – 3.2

Surface Color: Yellow Form: Orthorhombic Streak: White Luster: Vitreous, greasy, resinous Hardness: 1½ - 2½ Cleavage: Poor in 2 directions Fracture: Conchodial Specific Gravity: 2.0 – 2.1

Surface Color: Colorless Form: Cubic Streak: White Luster: Vitreous Hardness: 2 - 2½ Cleavage: Perfect in 3 directions Fracture: Conchodial Specific Gravity: 2.1 – 2.2

Surface Color: Colorless, white Form: Hexagonal Streak: White Luster: Vitreous Hardness: 7 Cleavage: None Fracture: Conchodial Specific Gravity: 2.6 – 2.7

Quartz Variations Rose Quartz – pink Smoky Quartz – black Milky Quartz – milky white Citrine – yellow Amethyst – Purple Tiger’s Eye Agates Geodes

Surface Color: Green, Bluish Green Form: Orthorhombic Streak: Light Green Luster: Vitreous, Waxy, Earthy Hardness: 2½ - 3½ Cleavage: None Fracture: Irregular Specific Gravity: 1.9 – 2.4

Surface Color: Copper-red (tarnish: black, green) Form: Cubic (often flattened) Streak: Copper-red (shiny) Luster: Metallic Hardness: 2½ - 3 Cleavage: None Fracture: Hackly Specific Gravity: 8.8 – 8.9

Surface Color: Golden-yellow (tarnish: blue, green…) Form: Tetragonal (3 equal planes all at 90 o ) Streak: Greenish black Luster: Metallic Hardness: 3½ - 4 Cleavage: Poor in 1 direction Fracture: Uneven/brittle Specific Gravity: 4.1 – 4.3

Surface Color: Shades of green Form: Monoclinic Streak: Light green Luster: Adamantine, silky, dull Hardness: 3½ - 4 Cleavage: Perfect in 1 direction Fracture: Conchodial Specific Gravity: 3.9 – 4.0 Azurite – Cu 3 (CO 3 ) 2 (OH) 2

Surface Color: Brass-yellow Form: Cubic Streak: Greenish black Luster: Metallic Hardness: 6 - 6½ Cleavage: None Fracture: Uneven/brittle Specific Gravity: 4.9 – 5.2

Surface Color: Iron-black Form: Cubic Streak: Black Luster: Metallic Hardness: 5½ - 6½ Cleavage: None Fracture: Uneven subconchodial Specific Gravity: 4.9 – 5.2