metamorphic
Quartz-rich vein rock (milky quartz with dark host-rock inclusions)
Predominantly quartz (SiO₂), with unidentified dark silicate/mineral inclusions; exact rock type cannot be confirmed visually
AI-generated identification · may be incorrectOpaque white to cream quartz with gray patches, uneven fracture, and a dull to vitreous luster. Quartz has Mohs hardness 7, trigonal crystal structure, no cleavage, and specific gravity about 2.65.
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Physical properties
Opaque white to cream quartz with gray patches, uneven fracture, and a dull to vitreous luster. Quartz has Mohs hardness 7, trigonal crystal structure, no cleavage, and specific gravity about 2.65.
Formation & geological history
Likely formed when silica-rich fluids filled fractures and crystallized as a quartz vein, later weathered into a rounded hand specimen. The age and original host rock cannot be determined from the image.
Uses & applications
Quartz-rich material is used as a silica source, aggregate, and ornamental stone; this irregular specimen is mainly suitable for collecting or display.
Geological facts
The gray areas may be fragments of host rock or other minerals, rather than a distinct gemstone zone; testing and closer examination would be needed to identify them.
Field identification & locations
Look for hardness near 7, glassy fracture surfaces, and absence of cleavage; quartz veins occur in many rock types worldwide. A common hand-sized specimen like this is typically worth about $1–$10 USD.
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