Rock Identifier
Quartz on Host Rock (Silicon Dioxide (SiO2)) — Mineral Specimen
Mineral Specimen

Quartz on Host Rock

Silicon Dioxide (SiO2)

Hardness: 7 (Mohs scale); Color: Colorless/transparent quartz with tan/brown host rock; Luster: Vitreous (glassy) on crystals, earthy on matrix; Crystal Structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.65

Hardness
7 (Mohs scale)
Color
Colorless/transparent quartz with tan/brown host rock
Luster
Vitreous (glassy) on crystals, earthy on matrix
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Physical properties

Hardness: 7 (Mohs scale); Color: Colorless/transparent quartz with tan/brown host rock; Luster: Vitreous (glassy) on crystals, earthy on matrix; Crystal Structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.65

Formation & geological history

Formed through hydrothermal processes where silica-rich fluids cooled in cavities or fissures within igneous or sedimentary rocks. This specimen shows druzy quartz crystals growing on a porous volcanic or sedimentary matrix.

Uses & applications

Primarily used as a collector specimen edge; high-purity quartz is used in microelectronics and glass making, while crystals are used in metaphysical practices and jewelry.

Geological facts

Quartz is one of the most abundant minerals in Earth's crust. The porous nature of the host rock in this specimen suggests it may have come from a geode-like cavity where fluids circulated freely to deposit crystals.

Field identification & locations

Identify by its ability to scratch glass (hardness 7) and its glassy luster. It is commonly found in mountainous regions, riverbeds, and volcanic outcrops worldwide. Collectors look for well-defined crystal faces and clear transparency.

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