mineral

Quartz (possibly Citrine or Smoky Quartz variety)

Silicon Dioxide (SiO2)

Hardness: 7 on Mohs scale; Color: yellowish-transparent; Luster: Vitreous/glassy; Crystal structure: Trigonal; Cleavage: None (conchoidal fracture); Specific gravity: 2.65.

Hardness: 7 on Mohs scale
Color: yellowish-transparent
Luster: Vitreous/glassy

Identified May 17, 2026More mineral →

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Physical properties

Hardness: 7 on Mohs scale; Color: yellowish-transparent; Luster: Vitreous/glassy; Crystal structure: Trigonal; Cleavage: None (conchoidal fracture); Specific gravity: 2.65.

Formation & geological history

Formed through the cooling of silica-rich magma or from hydrothermal veins. This specimen can be found in igneous rocks like granite or metamorphic rocks like quartzite.

Uses & applications

Used extensively in the electronics industry (piezoelectric properties), glassmaking, jewelry (gemstone quality), and as architectural stone.

Geological facts

Quartz is the second most abundant mineral in Earth's continental crust. It is highly resistant to both chemical and physical weathering.

Field identification & locations

Identify by its 7 hardness (it can scratch glass and steel), lack of cleavage, and glassy appearance. Commonly found in riverbeds, mountains, and desert sands.

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