metamorphic
Quartz Pebble with Muscovite Mica
Quartzite / Quartz-Mica Schist pebble (SiO2 with KAl2(AlSi3O10)(OH)2)
Hardness: 6.5-7 on Mohs scale; Color: Creamy off-white, pale tan, yellow-brown with silver shiny metallic flakes; Luster: Glassy to dull matrix with highly reflective pearly/metallic flakes; Structure: Massive to foliated microcrystalline quartz matrix with platy mica inclusions
- Hardness
- 6
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Physical properties
Hardness: 6.5-7 on Mohs scale; Color: Creamy off-white, pale tan, yellow-brown with silver shiny metallic flakes; Luster: Glassy to dull matrix with highly reflective pearly/metallic flakes; Structure: Massive to foliated microcrystalline quartz matrix with platy mica inclusions
Formation & geological history
Formed through regional metamorphism of sandstone or granite rich in clay/feldspar, causing recrystallization into quartz and platy muscovite mica. Later eroded and rounded by stream or beach water action.
Uses & applications
Commonly collected as stream or beach pebbles, used for decorative gravel, landscaping, lapidary tumbling, and educational rock collections.
Geological facts
The brilliant silver shine in the center is caused by muscovite mica flakes, which were historically used as heat-resistant windows in ovens and kilns before modern glass was available.
Field identification & locations
Identify in the field by its hard quartz matrix that scratches steel, combined with paper-thin, highly shiny metallic silvery flakes embedded within that flake off with a pin. Commonly found in riverbeds, glacial tills, and gravel pits near metamorphic regions.
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