mineral

Clear Quartz crystals on a Matrix base (Geode fragment)

Silicon Dioxide (SiO2)

AI-generated identification · may be incorrect

Hardness: 7 on Mohs scale; Color: Colorless to white; Luster: Vitreous (glassy); Crystal Structure: Hexagonal; Cleavage: None/Conchoidal fracture; Specific Gravity: 2.65

Hardness: 7 on Mohs scale
Color: Colorless to white
Luster: Vitreous (glassy)

Identified February 24, 2026More mineral →

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Physical properties

Hardness: 7 on Mohs scale; Color: Colorless to white; Luster: Vitreous (glassy); Crystal Structure: Hexagonal; Cleavage: None/Conchoidal fracture; Specific Gravity: 2.65

Formation & geological history

Quartz forms through the cooling of silica-rich magma or precipitation from hydrothermal fluids. These specific specimens are common in geode cavities found in volcanic or sedimentary environments, often dating from the Cretaceous to Cenozoic eras.

Uses & applications

Decorative art, gemstone jewelry, electronic oscillator circuits (synthetic), glass manufacturing, and abrasive materials.

Geological facts

Quartz is the second most abundant mineral in Earth's continental crust. Clear quartz is often referred to as 'Rock Crystal' and has been used since antiquity for carvings and optical lenses.

Field identification & locations

Identified by its crystal habit and hardness (ability to scratch glass). Common locations include Brazil, USA (Arkansas/New York), and Madagascar. This specific item is a handcrafted 'gem tree' using tumbled quartz chips.