mineral
Mica Sand / Vermiculite
Phyllosilicate group (typically Biotite or Muscovite)
Hardness: 2-3 (Mohs), Color: Silver, gold, or brown metallic flakes, Luster: Pearly to metallic, Crystal Structure: Monoclinic (platy/foliated cleavage), Specific Gravity: 2.7-3.0
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Physical properties
Hardness: 2-3 (Mohs), Color: Silver, gold, or brown metallic flakes, Luster: Pearly to metallic, Crystal Structure: Monoclinic (platy/foliated cleavage), Specific Gravity: 2.7-3.0
Formation & geological history
Formed through metamorphic or igneous processes, often found in pegmatites or schists. The loose flakes pictured are likely weathered residues or exfoliated industrial vermiculite used in gardening and construction.
Uses & applications
Used as an insulator, in potting soil for aeration/water retention, in plaster and concrete additives, and as a filler in paints and plastics.
Geological facts
Mica is famous for its perfect basal cleavage, allowing it to be split into extremely thin, flexible, and transparent sheets. In the past, large sheets were used as windows known as 'Muscovy glass'.
Field identification & locations
Identifiable by its shiny, flaky, 'glitter-like' appearance in soil or sand. Often found in riverbeds or near granitic outcrops. Collectors look for large 'books' of mica crystals.
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