mineral
Quartz vein in dark host rock
Quartz (SiO₂), likely in basalt, gabbro, or altered mafic rock
AI-generated identification · may be incorrectWhite to translucent quartz has Mohs hardness 7, vitreous luster, and no cleavage; the dark host appears fine-grained and may contain iron-oxide staining. Crystal form is difficult to resolve from the photograph.
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Physical properties
White to translucent quartz has Mohs hardness 7, vitreous luster, and no cleavage; the dark host appears fine-grained and may contain iron-oxide staining. Crystal form is difficult to resolve from the photograph.
Formation & geological history
Quartz commonly precipitates from silica-rich hydrothermal fluids filling fractures in older igneous rock; the host may be Precambrian to younger, depending on locality. Exact age and rock identity require testing.
Uses & applications
Common quartz-bearing rock is mainly collected as a specimen; quartz is widely used in glass, ceramics, electronics, abrasives, and gemstones, though this small piece has little commercial value.
Geological facts
The pale material may also include calcite or feldspar, which can resemble quartz; a hardness test and dilute acid test help distinguish them.
Field identification & locations
Look for glassy luster, conchoidal fracture, and inability to scratch quartz with a steel knife; calcite fizzes weakly in acid and is softer. Common in hydrothermal veins worldwide.
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