sedimentary
Quartz Vein in Siltstone
SiO2 (Quartz) on clastic sedimentary matrix
Hardness: Quartz (7), Siltstone (3-5); Color: White vein on dark brown/reddish matrix; Luster: Glassy (quartz) to dull (siltstone); Structure: Hexagonal crystals (microscopic) in vein.
- Hardness
- Quartz (7), Siltstone (3-5)
- Color
- White vein on dark brown/reddish matrix
- Luster
- Glassy (quartz) to dull (siltstone)
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Physical properties
Hardness: Quartz (7), Siltstone (3-5); Color: White vein on dark brown/reddish matrix; Luster: Glassy (quartz) to dull (siltstone); Structure: Hexagonal crystals (microscopic) in vein.
Formation & geological history
Formed through the deposition of fine-grained sediment (siltstone) followed by hydrothermal activity where silica-rich fluids filled fractures to create the white quartz vein.
Uses & applications
Primarily of interest to mineral collectors or as a geological teaching specimen; larger deposits of quartz are used in glass-making and electronics.
Geological facts
Quartz veins are often 'paths' for gold and other precious metals, though this small specimen is likely just common milky quartz.
Field identification & locations
To identify in the field, look for the sharp contrast between the white, hard crystalline material (quartz) and the softer, earthy, reddish-brown host rock.
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