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15 Cards in this Set
- Front
- Back
Which is the softest crystal direction in diamond?
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Dodecahedral |
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Solid matter with atoms arranged in a regular, repeating pattern is called a(n)
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crystal |
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The habit of gem-quality diamond is the
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octahedron |
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The diamond term glassie refers to
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a well-formed octahedral crystal.
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In diamonds, cleavage is caused by
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relatively wide spaces between some atomic planes.
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The crystal planes most suitable for cleaving a diamond are the
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octahedral planes.
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Squares or rectangles, trigons, and parallel grooves are types of
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growth marks.
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A naturally occurring, inorganic substance with a characteristic chemical composition and usually a characteristic crystal structure is known as a
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mineral |
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Atoms in a gem that aren’t part of its essential chemical composition are called
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trace elements.
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Crystal shape is an important factor in the evaluation of rough because
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it affects the amount of weight retained after cutting.
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The strongest of all atomic bonds are called
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covalent |
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What is the specific gravity of gem-quality diamond?
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3.52
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A flat, triangular twinned diamond crystal is called a
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macle |
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Another name for the cubic crystal system is
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isometric |
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The smallest group of atoms with a characteristic chemical composition and the basic crystal structure of a mineral is called a(n)
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unit cell.
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