Mica– Near Rapid City, South Dakota Two-Specimen Set Dimensions: 5.1 × 3.9 × 0.3 cm and 5.8 × 2.9 × 0.4 cm
Provenance: Original catalog label Nos. 244 & 245 included
Two thin specimens of pale silvery to champagne-colored Mica displaying broad, highly reflective sheets and excellent basal cleavage. The translucent layers separate into exceptionally thin flexible sheets, producing a pearly to glassy luster across the surfaces.
Mica is a group of sheet silicate minerals characterized by perfect basal cleavage, allowing crystals to split readily into extremely thin, flexible sheets. The Black Hills region of South Dakota is well known for mica-bearing granitic pegmatites.
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