mineral
Quartz vein fragment
Quartz, silicon dioxide (SiO₂), likely milky to translucent quartz with iron-oxide or clay inclusions
AI-generated identification · may be incorrectHardness 7, glassy to greasy luster, white-gray translucent color, conchoidal fracture, no cleavage, and specific gravity about 2.65; the rough elongated piece appears partly weathered or saw-cut. Crystal structure is trigonal, though obvious crystal faces are limited.
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Physical properties
Hardness 7, glassy to greasy luster, white-gray translucent color, conchoidal fracture, no cleavage, and specific gravity about 2.65; the rough elongated piece appears partly weathered or saw-cut. Crystal structure is trigonal, though obvious crystal faces are limited.
Formation & geological history
Likely formed when silica-rich hydrothermal fluids filled a fracture in host rock, later exposed by weathering; exact geological age cannot be determined from the image. The small pale crystals may be quartz druse or an associated mineral.
Uses & applications
Used as a decorative or lapidary specimen and as a silica source for glass, ceramics, and engineered stone; this piece appears primarily collectible rather than gem-quality.
Geological facts
Quartz is one of Earth’s most abundant minerals and commonly forms veins cutting through igneous, metamorphic, and sedimentary rocks.
Field identification & locations
Test with a steel file or glass: quartz should scratch glass and resist a steel blade. Common worldwide, especially in hydrothermal veins; inspect for hexagonal crystal tips, cleavage absence, and any host rock before collecting.
