mineral
Quartz with Mica (Muscovite or Biotite)
Silicon Dioxide (SiO2) with Phyllosilicates
Hardness: 7 (Quartz) and 2-3 (Mica); Color: Milky white with black/dark grey inclusions; Luster: Vitreous to pearly; Crystal structure: Trigonal/Monoclinic; Specific gravity: 2.65 for Quartz.
- Hardness
- 7 (Quartz) and 2-3 (Mica)
- Color
- Milky white with black/dark grey inclusions
- Luster
- Vitreous to pearly
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Physical properties
Hardness: 7 (Quartz) and 2-3 (Mica); Color: Milky white with black/dark grey inclusions; Luster: Vitreous to pearly; Crystal structure: Trigonal/Monoclinic; Specific gravity: 2.65 for Quartz.
Formation & geological history
Commonly formed in igneous pegmatites or metamorphic rocks through the slow cooling of silica-rich fluids. The dark minerals are mica inclusions trapped during crystal growth.
Uses & applications
Quartz is used in glassmaking, abrasives, and electronics. Specimens like this are primarily used for education, mineral collecting, or decorative landscaping.
Geological facts
Quartz is the second most abundant mineral in Earth's continental crust. Mica is famous for its perfect basal cleavage, allowing it to be split into extremely thin, flexible sheets.
Field identification & locations
Identify by checking hardness (quartz will scratch glass) and looking for the flaky, metallic-looking dark plates of mica. Commonly found in mountainous regions or riverbeds near igneous intrusions.
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