Sed. Rock Key

Sed. Rock Key - Minerals - Tray 1 Sample Number 1 2 3 4 5 6...

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Minerals - Tray 1 Sample Number Luster Hardness Streak Cleavage Other Properties Mineral Name Chemical Grouping 1 Metallic 2.5 Shiny lead grey 3 @ 90º Heavy for its size Galena Sulfide 2 Vitreous 2.5 White 3 @ 90º Salty taste, Soluble Halite Halide 3 Metallic 2.5 - 3.0 Copper Red None Soft (sectile tenacity) Native Copper Element 4 Pearly, Greasy 1.0 - 1.5 White 1 ( or None) Marks cloth; soft; smooth; greasy Talc (Sheet Silicate) 5 Metallic, Earthy, 5.5 - 6.5 Red, Brownish-Red None Moderately heavy for its size Hematite Oxide Sub-Metallic 6 Dull, Earthy 2.0 - 2.5 White, Pale Brown None Friable (easily crumbled) Kaolinite (Sheet Silicate) 7 Resinous, Adiamantine, 3.5 - 4.0 White, Yellow, 6 Sulfur smell Sphalerite Sulfide Sub-Metallic Light Brown 8 Metallic, Dull/Earthy 1.0 - 2.0 Black, Dark Grey 1 (or None) Marks paper and hands; slippery Graphite Element 9 Resinous, Vitreous 6.5 - 7.5 White None Uneven, brittle fracture Garnet 10 Metallic, Dull 5.5 - 6.0 Black None Moderately heavy for its size; Magnetite Oxide uneven fracture; strongly magnetic 11 Vitreous 4.0 White 4 Fluoresces in UV light Fluorite Halide 12 Dull, Earthy 2.5 - 3.5 White or none None Pisoids/concretions; conchoidal fracture Bauxite Oxide 13 Dull, Earthy 1.0 - 5.5 Yellow-Brown None Limonite Oxide 14 Waxy, Resinous, 1.5 - 2.5 White 2 (poor) or None Sulfur smell Sulfur Element Adiamantine 15 Dull, Earthy 3.5 - 4.0 Blue (Azurite) None Reacts to HCl Azurite Carbonate Green (Malachite) or Malachite 16 Vitreous, Pearly 1.5 - 2.0 White 1 (perfect) with Gypsum Sulfate 2 (poor, fibrous) @ 66º and 114º 17 Metallic 6.0 - 6.5 Brownish-Black, None Moderately heavy for its size Pyrite Sulfide Sheet of SiO 2 Tetrahedra Sheet of SiO 2 Tetrahedra Isolated SiO 2 Tetrahedra
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Greenish-Black 18 Vitreous, Pearly 3.0 - 3.5 White 2 @ 78º, 1 @ 90º 3 cleavage planes; heavy for its size Barite Sulfate
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Rock-Forming Minerals Sample Number Luster Hardness Streak Cleavage Other Properties Mineral Name Chemical Grouping 1 Vitreous 3.0 White, Grey 3, with Calcite Carbonate 1 @ 78º and rhombohedral cleavage 1 @ 102º 2 Vitreous 5.0 - 6.0 White, Grey-Green, 2, with Hornblende Brownish 1 @ 54º and needle-like form; (Amphibole) (Double-Chain Silicate) 1 @ 126º diamond-shaped cross-section 3 Vitreous 6.0 White 2 @ 90º Blebby texture (elongated "blobs" Orthoclase visible on cleavage surface (K-Feldspar) (Framework Silicate) 4 Vitreous 6.0 White 2 @ 90º Fine striae on cleavage faces; Albite light-colour (Na-Plagioclase) (Framework Silicate) 5 Vitreous 7.0 White None Quartz colours (Framework Silicate)
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Sed. Rock Key - Minerals - Tray 1 Sample Number 1 2 3 4 5 6...

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