igneous
Quartz-bearing weathered rock, possibly pegmatite or quartz vein
Quartz (SiO₂) with probable feldspar, mica, and iron-oxide staining; exact host rock is uncertain
AI-generated identification · may be incorrectCoarse, sparkly interlocking grains; translucent to milky quartz with white feldspar-like material and yellow-brown iron staining, alongside a dark fine-grained host. Quartz hardness is 7 Mohs, vitreous luster, no cleavage; overall specific gravity likely about 2.6–2.7.
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Physical properties
Coarse, sparkly interlocking grains; translucent to milky quartz with white feldspar-like material and yellow-brown iron staining, alongside a dark fine-grained host. Quartz hardness is 7 Mohs, vitreous luster, no cleavage; overall specific gravity likely about 2.6–2.7.
Formation & geological history
Likely formed from silica-rich hydrothermal veins or a slowly cooled felsic intrusion, later fractured and oxidized near the surface; age cannot be determined from the photograph.
Uses & applications
Common quartz-rich rock is mainly a collector specimen or educational sample; similar pegmatites provide quartz, feldspar, mica, and occasionally gem minerals or lithium ores, but this piece has little commercial value.
Geological facts
The glitter is probably exposed quartz or mica cleavage surfaces, while the ochre coloration is limonite/goethite produced by weathering of iron-bearing minerals.
Field identification & locations
Look for glassy translucent grains, scratch resistance, and irregular fracture; a steel nail should not scratch quartz. Common occurrences include granitic terrains and hydrothermal veins worldwide; acid testing and a hand lens would improve identification.
