Table 1

CHARTS FROM THE WONDERFUL AND INFORMATIVE WEBSITE: http://www.salem.mass.edu/~lhanson/gls100/lab_rocks/min_lab1.htm

Table 1.4. Types of cleavage.
Type of Cleavage	Description	Examples
Pinacoidal	1 plane of cleavage. Forms flat fragments or flakes with ragged edges.	muscovite, biotite, talc, chlorite, graphite
Prismatic	2 planes of cleavage.(Often the most difficult cleavage to identify.)	feldspars, amphiboles, pyroxenes
Cubic	3 planes of cleavage intersecting at right angles.	halite, galena
Rhombic	3 planes of cleavage not intersecting at right angles.	gypsum, calcite
Octahedral	4 planes of cleavage. (Forms triangular cleavage faces)	fluorite

Examples of partings and habits

1. fibrous parting of asbestos. asbestos occurs in fibrous aggregates of crystals.
2. basal parting of corundum. Corundum crystals or stacked like segments in a column.
3. flaky parting of graphite, chlorite, and talc. These minerals typically occur in aggregates of small flaky crystals.

Figure 1.3. Partings and modes of occurrence (habit).

Table 1.9. Examples of different types of tenacity.
Tenacity	Definition
Brittle	Crushes easily into fragments. Examples: most minerals
Malleable	Can be pounded into flat sheets. Example: gold
Elastic	Will bend, but regains original shape when stress is released. Examples: biotite and muscovite
Flexible	Will bend and stay bent once the stress is released Example: flakes of talc, graphite and chlorite