mineral

Massive Quartz with Host Rock

Silicon Dioxide (SiO2)

Hardness: 7 (Mohs scale); Color: White to milky translucent with grayish host inclusions; Luster: Vitreous to greasy; Crystal structure: Trigonal/Hexagonal (though massive/microcrystalline in this specimen); Cleavage: None (conchoidal fracture); Specific gravity: 2.65.

Hardness: 7 (Mohs scale)
Color: White to milky translucent with grayish host inclusions
Luster: Vitreous to greasy

Identified March 21, 2026More mineral →

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Physical properties

Formation & geological history

Formed from silica-rich hydrothermal fluids cooling in veins or cavities within existing rock, or via igneous crystallization in pegmatites. This specimen shows quartz alongside darker host rock (likely metamorphic or igneous), typical of many global geological ages from Proterozoic to Cenozoic.

Uses & applications

Industrial uses include glass making, electronics (semiconductors), and abrasives. Massive specimens like this are used as landscaping stone, construction aggregate, or as a source for high-purity silica.

Geological facts

Quartz is the second most abundant mineral in Earth's continental crust. It is chemically very stable and resistant to weathering, which is why it often remains as pebbles or large chunks long after surrounding minerals have eroded away.

Field identification & locations

Identify in the field by its hardness (it will scratch glass and steel), lack of cleavage, and translucent 'milky' appearance. This specimen appears to be a common find in gravel pits, riverbeds, or mountainous outcrops globally.

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