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 incorrect

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.

Identified September 29, 2026More metamorphic →

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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.