Term
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Definition
| a solid mass of individual, randomly oriented crystals, intergrown or held together by a natural binding agent |
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Definition
| plane parallel to a possible crystal face, where a diamond can split cleanly when struck |
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Definition
| a chemical bond formed by two atoms sharing electrons |
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Term
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Definition
| solid matter with atoms arranged in a regular, repeating pattern |
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Definition
| composed of crystals or related to crystals |
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Term
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Definition
| internal directions parallel to a mineral's unit cell surfaces |
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Term
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Definition
| geometric shape of a well-formed crystal |
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Term
| Crystal Structure (lattice) |
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Definition
| regular, repeating arrangement of atoms in a mineral |
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Term
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Definition
| categories of crystals based on their symmetry and internal structure |
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Definition
| the appearance of double images of a gemstone's facet junctions on the side opposite the viewer |
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Term
| Doubly Refractive (anisotropic) |
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Definition
| possessing different physical or optical properties in different crystal directions |
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Definition
| a well-shaped, transparent, octahedral diamond crystal with sharp, square edges |
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Term
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Definition
| crystal distortion caused during growth when one part of the lattice is offset in relation to the rest |
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Term
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Definition
| visible, shadow-like lines in a diamond caused by irregularities in the crystal structure |
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Term
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Definition
| characteristic crystal shape of a specific mineral |
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Term
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Definition
| a flat, triangular twinned diamond crystal |
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Term
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Definition
| a form with eight equal triangular sides |
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Term
| Singly Refractive (isotropic) |
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Definition
| possessing the same physical or optical properties in all crystal directions |
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Term
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Definition
| ratio of the weight of a material to that of an equal volume of water |
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Term
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Definition
| in diamond, a group of five carbon atoms with one at the center |
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Term
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Definition
| the relative ability of a material to transfer heat |
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Term
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Definition
| capacity of a material to expand when it's heated |
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Term
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Definition
| atoms in a gem that aren't part of its essential chemical composition |
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Term
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Definition
| crystal distorted during growth, with two or more intergrown crystals with opposing crystal directions |
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Term
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Definition
| smallest group of atoms with the characteristic chemical composition and the basic crystal structure of a mineral |
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