An essential component of any specimen. Old labels are desirable.

 

Layered masses that aggregate together like sheets of paper.

 

The electric cap lamp worn for visibility. Also, the flame safety lamp used in coal mines to detect methane gas concentrations and oxygen deficiency.

 

Specimens starting at 4 inches across the primary display face and larger.

 

An imaginary pattern of points (or nodes) in which every point has an environment that is identical to that of any other point in the pattern

 

Primitive (P), body-centered (I), face-centered (F), rhombohedral (R) or end-centered (A,B,C)

 

The design or pattern of the main roadways and workings. The proper layout of mine workings is the responsibility of the manager aided by the planning department.

 

A heavy, soft, malleable, ductile but inelastic bluish grey metallic element found mostly in combination.

 

A round habit, having the form of a convex lens.

 

The character of a rock described in terms of its structure, color, mineral composition, grain size, and arrangement of its component parts; all those visible features that in the aggregate impart individuality of the rock.

 

The specific place a specimen was found. The more detailed, the better.

 

One of three major underground coal mining methods currently in use. Employs a steal plow, or rotation drum, which is pulled mechanically back and forth across a face of coal that is usually several hundred feet long. The loosened coal falls onto a conveyor for removal from the mine.

 

A descriptive term used to describe the appearance of minerals such as dull, earthy, fibrous, gemmy, greasy, gumdropy, metallic, resinous, and waxy.