2. BASIC COMPONENTS. Coarse mineral components.
With very strong laminar habit. A very clear linear exfoliation system.
Moscovite. Only Polarizer: Colorless. Polarizer and Analyzer: bright interference colors (second order).
Biotite. Only Polarizer: Brown or colorless, with pleochroism. Polarizer and Analyzer: the interference colors are disguised by the natural brown color.
Chlorite. Only Polarizer: Green
color. Polarizer and Analyzer: very low interference colors and frequently
anomalous, with bluish coloring. In many cases, it is a product of the alteration
of biotite.
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