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15 Cards in this Set

  • Front
  • Back

Which is the softest crystal direction in diamond?

Dodecahedral

Solid matter with atoms arranged in a regular, repeating pattern is called a(n)

crystal

The habit of gem-quality diamond is the

octahedron

The diamond term glassie refers to

a well-formed octahedral crystal.

In diamonds, cleavage is caused by

relatively wide spaces between some atomic planes.

The crystal planes most suitable for cleaving a diamond are the

octahedral planes.

Squares or rectangles, trigons, and parallel grooves are types of

growth marks.

A naturally occurring, inorganic substance with a characteristic chemical composition and usually a characteristic crystal structure is known as a

mineral

Atoms in a gem that aren’t part of its essential chemical composition are called

trace elements.

Crystal shape is an important factor in the evaluation of rough because

it affects the amount of weight retained after cutting.

The strongest of all atomic bonds are called

covalent

What is the specific gravity of gem-quality diamond?

3.52

A flat, triangular twinned diamond crystal is called a

macle

Another name for the cubic crystal system is

isometric

The smallest group of atoms with a characteristic chemical composition and the basic crystal structure of a mineral is called a(n)

unit cell.