mineral

Quartz Crystal (specifically a milky or semi-translucent single crystal point)

Silicon Dioxide (SiO2)

Hardness: 7 on Mohs scale; Color: Colorless to white/milky; Luster: Vitreous (glass-like); Crystal structure: Trigonal/Hexagonal prism with pyramidal terminations; Cleavage: None (conchoidal fracture); Specific gravity: 2.65.

Hardness: 7 on Mohs scale
Color: Colorless to white/milky
Luster: Vitreous (glass-like)

Identified February 14, 2026More mineral →

Explore Quartz Crystal (specifically a milky or semi-translucent single crystal point) in the encyclopedia →

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Physical properties

Formation & geological history

Formed from silica-rich hydrothermal fluids or within pegmatites as magma cools. Quartz is found in almost all geological environments and across all geological ages, typically in veins or cavities where crystals have room to grow.

Uses & applications

Used in electronics (oscillators), manufacturing of glass, abrasives, and as semi-precious gemstones in jewelry. Widely collected as metaphysical or decorative points.

Geological facts

Quartz is the second most abundant mineral in Earth's continental crust. It is piezoelectric, meaning it generates an electric charge when mechanical stress is applied, which is why it's used in watches and clocks.

Field identification & locations

Identify in the field by its 6-sided hexagonal prism shape and its ability to scratch glass (Hardness 7). This specimen shows typical conchoidal fracture where the crystal has broken. Common in the Appalachian Mountains, Arkansas (USA), and Minas Gerais (Brazil).

Other mineral specimens

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Sandstone (with potential mineral staining/concretions)

Arenite (SiO2 based)

sedimentary

Schist

Metamorphic

Epidote

Epidote | Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)

metamorphic

Gypsum (variety Selenite or Alabaster)

Calcium sulfate dihydrate (CaSO4·2H2O)

Mineral

Nephrite Jade

Nephrite

Mineral/Rock

Granite

Granite (Phaneritic intrusive igneous rock)

igneous