mineral

Quartz Vein in Host Rock

Silicon Dioxide (SiO2) in matrix

Hardness: 7 (Mohs scale) for quartz; Color: White to milky white milky quartz on a dark brown/grey host rock; Luster: Vitreous to greasy; Crystal structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture)

Hardness: 7 (Mohs scale) for quartz
Luster: Vitreous to greasy

Identified June 14, 2026More mineral →

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Physical properties

Formation & geological history

Formed by hydrothermal fluids rich in silica precipitating in cracks or fissures within a pre-existing host rock. This usually occurs deep within the crust during orogenic (mountain-building) events.

Uses & applications

Commercial quartz is used in glass making, electronics (as oscillators), abrasives, and as decorative landscape stone. This specific specimen has value primarily as a learning tool or minor collector item.

Geological facts

Quartz is the second most abundant mineral in Earth's continental crust. Vein quartz often acts as a 'host' for precious metals like gold, which can be deposited by the same hydrothermal fluids.

Field identification & locations

Identify by its ability to scratch glass and its lack of cleavage. Look for the white 'ribbon' or crystalline infill against a darker, duller rock background. Common in any geologically active or mountainous region.

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Sandstone (with potential mineral staining/concretions)

Arenite (SiO2 based)

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Schist

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Epidote

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Nephrite Jade

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Mineral/Rock

Banded Gneiss (River Rock/Pebble)

Gneiss (specifically a banded variety often found as a river rock)

Metamorphic Rock

Biotite Schist

Biotite-rich Schist [K(Mg,Fe)3AlSi3O10(F,OH)2]

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