sedimentary
Sandstone with Quartz Crystal Infill
Quartz-cemented quartz arenite
Hardness of 7 (due to quartz), colors range from tan and beige to dark brown/black where mineral or organic staining is present, vitreous to dull luster, granular crystal structure, specific gravity around 2.65.
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Physical properties
Hardness of 7 (due to quartz), colors range from tan and beige to dark brown/black where mineral or organic staining is present, vitreous to dull luster, granular crystal structure, specific gravity around 2.65.
Formation & geological history
Formed through the accumulation, compaction, and cementation of mineral particles or rock fragments, often in desert, beach, or river environments, followed by hydrothermal fluid infiltration precipitating micro-crystals.
Uses & applications
Predominantly used as geological specimens for collection, educational purposes, and occasionally in landscaping or decorative stone.
Geological facts
These specimens often form in vugs or cavities within sedimentary layers where silica-rich groundwater deposits sparkling secondary quartz crystals onto a weathered matrix.
Field identification & locations
Identified by visible sand grains fused together combined with druzy quartz crystals sparkling on the surface. Commonly found in sedimentary basins worldwide.
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