sedimentary
Sandstone (Micaceous)
Arenite (primarily SiO2 with Phyllosilicates)
Hardness: 6-7 (Mohs scale for grains); Color: Tan/Brown/Gold; Luster: Dull to Vitreous (sparkly due to mica); Crystal Structure: Clastic/Granular; Cleavage: None (fractures around grains)
- Hardness
- 6-7 (Mohs scale for grains)
- Color
- Tan/Brown/Gold
- Luster
- Dull to Vitreous (sparkly due to mica)
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Physical properties
Hardness: 6-7 (Mohs scale for grains); Color: Tan/Brown/Gold; Luster: Dull to Vitreous (sparkly due to mica); Crystal Structure: Clastic/Granular; Cleavage: None (fractures around grains)
Formation & geological history
Formed through the accumulation and cementation of sand-sized mineral grains or rock fragments. The presence of sparkles suggests it was deposited in a medium-energy environment like a riverbed or shoreline where mica flakes settled with quartz sand.
Uses & applications
Used in construction as a building stone or road aggregate. Higher quality micaceous varieties can be used as decorative stones or in landscaping.
Geological facts
Sandstone is one of the most common sedimentary rocks on Earth. The 'sparkle' often found in these small specimens is usually due to muscovite or biotite mica, which reflects light from thin, flat planes.
Field identification & locations
Identify by its gritty texture (feels like sandpaper) and visible grains. It is commonly found in sedimentary basins and eroded cliff sides worldwide.
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