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Minerls review - Assessment Branch 2007/08 School Year...

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Assessment Branch – 9 – Geology 12 2007/08 School Year Data Pages Properties of Common and Important Minerals Mineral Colour Streak Lustre Form and Other Properties Cleavage Hardness Amphibole (hornblende) dark green to black white-grey vitreous long crystals, grains 2 excellent at 56° 6 3.0 – 3.4 Apatite usually green white vitreous hexagonal crystals 1 poor, conchoidal fracture 5 3.1 Asbestos green or black none to white waxy fibrous or silky masses none 2.5 – 5.0 3.1 Azurite blue pale blue earthy–vitreous earthy mass or tiny crystals, fizzes in acid seldom visible 3.5 – 4.0 3.8 Bornite iridescent blue, purple grey-black metallic dense brittle masses none 3 5.0 Calcite white, pink or yellow white-grey vitreous rhombohedral crystals, granular, fizzes in acid 3 perfect, not at 90° 3 2.7 Chalcopyrite golden-brassy yellow black metallic tetrahedral crystals or fine-grained masses 1 poor 3.5 – 4.0 4.2 Chlorite green to dark green pale green vitreous-earthy scaly masses 1 perfect 2.5 2.6 – 3.3 Feldspar (plagioclase)
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