mineral
Quartz-rich veined rock, likely milky quartz with feldspar or calcite
Quartz (SiO₂), possibly in a quartz–feldspar or quartz–calcite vein
AI-generated identification · may be incorrectWhite to translucent gray, vitreous to pearly luster, irregular fracture, and no obvious cleavage; quartz hardness is Mohs 7, while associated feldspar is about 6 or calcite 3. The granular, interlocking texture suggests a vein or altered rock rather than a single crystal.
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Physical properties
White to translucent gray, vitreous to pearly luster, irregular fracture, and no obvious cleavage; quartz hardness is Mohs 7, while associated feldspar is about 6 or calcite 3. The granular, interlocking texture suggests a vein or altered rock rather than a single crystal.
Formation & geological history
Likely formed when silica-rich hydrothermal fluids filled fractures and crystallized, commonly during cooling of igneous bodies or metamorphism. Exact geological age and locality cannot be determined from the photograph.
Uses & applications
Quartz veins are used as silica feedstock, aggregate, and decorative stone; attractive pieces may be collected or cut as ornamental material, though this specimen appears modestly gem-grade.
Geological facts
Translucent quartz commonly shows cloudy inclusions, staining, and internal fractures. A glass-scratch test can support quartz identification, but should be performed only on an inconspicuous area.
Field identification & locations
Common in mountain belts, granitic terrains, and hydrothermal districts worldwide. Confirm with hardness, streak (white), and acid testing: calcite fizzes in dilute hydrochloric acid, whereas quartz does not.
