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colored stones 3

colored-stones-3

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A unit cell defines a mineral’s

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If a crystal grows in a flux that is highly saturated with the necessary elements, it tends to be

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Which aggregate’s crystals are visible only with magnification greater than a standard gemological microscope’s?

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Which is classified in the orthorhombic crystal system?

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Which element causes red in ruby and green in emerald?

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Which type of twinning is caused by environmental change after the gem forms?

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Which type of twinning looks as if two crystal halves are mirror images?

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Needles of actinolite found in emerald are classified as

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A two-phase inclusion is a cavity in a gem that’s typically filled with a

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Atoms in a gem that are not part of its essential chemical composition are

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