mineral
Milky quartz fragment
Quartz (silicon dioxide, SiO₂)
AI-generated identification · may be incorrectUsually white to translucent with a vitreous-to-waxy luster; Mohs hardness 7, no cleavage, conchoidal fracture, hexagonal crystal structure, and specific gravity about 2.65. The irregular granular texture suggests a rough, naturally broken piece rather than a complete crystal.
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Physical properties
Usually white to translucent with a vitreous-to-waxy luster; Mohs hardness 7, no cleavage, conchoidal fracture, hexagonal crystal structure, and specific gravity about 2.65. The irregular granular texture suggests a rough, naturally broken piece rather than a complete crystal.
Formation & geological history
Quartz crystallizes from silica-rich igneous, hydrothermal, and metamorphic fluids; milky coloration results mainly from microscopic fluid inclusions and fractures. Its exact geological age and source cannot be determined from the photograph.
Uses & applications
Used extensively in glass, ceramics, electronics, abrasives, engineered stone, and construction aggregate; attractive translucent pieces are collected or used decoratively, though this specimen appears low-grade.
Geological facts
Quartz is one of Earth’s most abundant minerals and is highly resistant to weathering, commonly accumulating in stream gravels and sedimentary deposits.
Field identification & locations
Likely quartz if it scratches glass or steel and shows no fizz with dilute hydrochloric acid; unlike calcite, it will not react. Common worldwide, especially in granite, pegmatite, quartz veins, and alluvial deposits.
