Gem Id Key Terms

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103 Cards. Created by karin ().
 
Term  
Definition

Amorphous

Lacking a regular crystal structure

Chemical composition

Kinds and relative quantities of atoms that make up a material

Crystal structure

Regular, repeating internal arrangement of atoms in a material

Gem species

A broad gem category based on chemical composition and crystal structure

Gem variety

A subcatagory of species, based on color, transparency, or phenomenon

Group

A family of gems made up of several closely related mineral species

Immitation gem (simulant)

Any material that looks like a natrual gem and is used in its place.

Inorganic

Composed of, or arising from, non-living matter.

Isomorphoun replacement

Substitution of one chemical element for another in the crystal structure of a mineral.

Mineral

A natural, inorganic substance with a characteristic chemical composition and, usually, a characteristic structure.

Organic

Produced by, or derived from, a living organism.

Phenomenon

An unusual optical effect displayed by a gem.

Separation

Process of distinguishing natural gems from each other as well as from synthetics, simulants, and treated gems.

Synthetic gem

A labratory creation with essentially the same chemical composition, crystal structure, and properties as its natural counterpart.

Trace elements

Atoms in a gem that aren't part of its essential chemical composition.

Cleavage

A smooth, flat break in a gemstone parallel to planes of atomic weakness.

Conchoidal fracture

A curved and redged fracture in a gemstone, extending from the surface inward.

Dispersion

The seperation of white light into spectral colors.

Fire

The flashes of spectral color you see in a polished gem, expecially a diamond.

Fracture

Any break in a gem other than cleavage or parting.