metamorphic
Tumbled quartzite or quartz-rich beach stone
Quartzite; predominantly microcrystalline quartz (SiO₂)
AI-generated identification · may be incorrectHardness about 7 Mohs; pale lavender-gray, translucent at the edges, with a sugary granular texture and vitreous-to-waxy luster. Quartz has a hexagonal crystal structure but no cleavage; quartzite is dense and massive.
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Physical properties
Hardness about 7 Mohs; pale lavender-gray, translucent at the edges, with a sugary granular texture and vitreous-to-waxy luster. Quartz has a hexagonal crystal structure but no cleavage; quartzite is dense and massive.
Formation & geological history
Likely a naturally rounded, tumbled fragment of quartz-rich rock, formed when quartz sandstone was metamorphosed and recrystallized under heat and pressure. Exact age and locality cannot be determined from the photograph.
Uses & applications
Used decoratively as a polished or tumbled stone, in aggregate, and occasionally as a minor gemstone material; it has little industrial value as an individual piece.
Geological facts
The lavender tint may reflect trace iron, inclusions, or surface lighting rather than true amethyst. Its granular “sugary” appearance is typical of quartzite rather than a single quartz crystal.
Field identification & locations
Identify it by its very high hardness, glassy sparkles, rounded shape, and inability to scratch with a steel knife; it should scratch ordinary glass. Common in quartz-rich metamorphic terrains and stream or beach gravels.
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