colored stones 2

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546641

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most gemstones form in the

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rocks altered by heat and pressure are

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which gem can crystallize in volcanic rock from gasses released by magma

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Which is a key locality for hydrothermal gems

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Which gem forms by metamorphism?

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Heat and pressure transform limestone into

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A deposit where gems are found in the rock that carried them to the earth’s surface is called

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Which type of deposit is usually the most profitable for colored stone mining?

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Which is a deposit where gems eroded from the source rock and remained in place nearby?

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Which is a workable alluvial deposit of gem minerals with economic potential?

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Kunzite is most often found in association with

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Myanmar’s famous Mogok ruby deposits were formed by

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Pegmatite gems are rich in volatile elements like

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Most of the gems in Tanzania’s Umba River Valley are found in

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Emeralds are rarely found in placer deposits because they’re

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