Color the quality of an object or substance with respect to light reflected by the object, usually determined visually by measurement of hue, saturation, and brightness of the reflected light; saturation or chroma; hue
Luster the state or quality of shining by reflecting light; glitter, sparkle, sheen, or gloss
Transparency (or diaphaneity) a. the proportion of the light that is passed through the emulsion on an area of a photographic image.
b. a photographic print on a clear base for viewing by transmitted light.
Crystal Systems any of the six main classifications of crystals and of crystal lattices according to their symmetry: isometric, hexagonal, tetragonal, orthorhombic, monoclinic, and triclinic.
Technical Crystal Habits the visible external shape of a mineral
Descriptive Crystal Habits There are basically two types: single crystal forms and aggregate forms. The single crystal terms are used to describe individual crystals and so terms like platy or prismatic are used.
Twinning intergrown crystal forms that display a twin boundary
Cleavage Foliation perpendicular to stress as a result of ductile deformation
Fracture individual crystals fracture without the body actually separating into two or more pieces. Depending on the substance which is fractured, a fracture reduces strength or inhibits transmission of light .
Hardness is the measure of how resistant solid matter is to various kinds of permanent shape change when a force is applied
Specific Gravity is the ratio of the density (mass of a unit volume) of a substance to the density of a given reference material
Streak the color left by a mineral dragged across a rough surface
Associated Minerals are minerals that are found in a small quantity with a more major mineral at a locality.
Notable Localities Excellent specimens of diverging groups of white prismatic crystals
Other Important Properties and Characteristics:
Fluorescence the emission of light by a substance...