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Gems
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precious or semiprecious stones formed from rock materials that were subjected to high temperature and pressure over a long period of time
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rare and expensive
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used mainly for jewelry and other ornamental purposes
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Diamond
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best example of an expensive gem
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comes from what used to be wood millions of years ago but was buried deep under Earth
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biggest diamond mines are in Africa
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a common gemstone found in the Philippines
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not of common variety
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a type or nephrite
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nephrite
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jadeite
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found in continents that are geologically older than islands
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with passage of time and under high temperature and pressure becomes either ruby (blood red stone) or sapphire (deep blue stone)
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responsible for the red color in ruby
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gives sapphire its deep blue color
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often found together in
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> Myanmar
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> Thailand
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> Cambodia
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> Vietnam
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> Tanzania
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> Madagascar
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> Australia
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a green gemstone is a type of beryl (a mineral consisting of beryllium and aluminum silicate)
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found in Asia, America, Africa, and Europe
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an opaque blue-green gemstone
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a hydrous phosphate of copper and aluminum
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first mined in the Sinai Peninsula and China
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also found in the United States, Chile, and Australia
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used as ornamental stones
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bearings in highly precise and small mechanical devices such as watches
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render lubricants unnecessarily
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Ruby and other transparent gems are used in laser-emitting devices to focus light.
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Cheatography n. The art of mapping complex subjects into clear, instantly navigable reference guides.
