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Published byLucas Adams Modified over 9 years ago
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Minerals Mar 3 2009
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Minerals are all non-living solid material most minerals are rare. Like gold common minerals are found throughout the earth’s crust. Like talc a mineral can be an element (a pure substance) or a compound (two or more substances)
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Identifying Minerals 1) The Mohs hardness scale - German scientist, Friedrich Mohs developed a scale of mineral “hardness” - a useful tool for mineral identification because there are over 3000 minerals
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The Mohs Hardness Scale MineralMineral hardnessHardness of Common Objects Talc1 softestSoft pencil point Gypsum2Fingernail Calcite3Piece of copper Fluorite4Iron nail Apatite5Glass Feldspar6Steel file Quartz7Streak plate Topaz8Sandpaper Corundum9Emery paper Diamond10
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2) Lustre some minerals, such as gold, appear shiny. some minerals, like talc, can appear dull. the lustre of an object depends on how light is reflected from it’s surface.
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3) Colour colour is the most attractive properties of minerals
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4) Cleavage and Fracture if a mineral breaks in smooth flat surfaces it has cleavage minerals which break with rough or jagged edges it has fracture
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