mineral

Quartz fragment

Quartz, silicon dioxide (SiO₂)

AI-generated identification · may be incorrect

White to translucent, vitreous-to-pearly luster with irregular fracture; Mohs hardness 7, trigonal crystal structure, no cleavage, and specific gravity about 2.65. The granular, glassy appearance is consistent with milky or fracture-rich quartz, though the photograph cannot confirm identity conclusively.

Identified September 22, 2026More mineral →

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Physical properties

Formation & geological history

Quartz crystallizes from silica-rich igneous and hydrothermal fluids and commonly forms in veins, pegmatites, and metamorphic rocks. It occurs throughout Earth’s geological history, from ancient Precambrian rocks to modern deposits.

Uses & applications

Used in glassmaking, foundry sand, ceramics, electronics, abrasives, countertops, and as a gemstone or lapidary material. This small rough fragment has negligible commercial value.

Geological facts

Quartz is one of Earth’s most abundant minerals and is a major component of granite, sandstone, and many metamorphic rocks. Its hardness allows it to scratch ordinary glass and steel.

Field identification & locations

Identify it by testing hardness, observing lack of cleavage, and checking for a white streak and conchoidal or uneven fracture; avoid confusing it with calcite, which is softer and effervesces in acid. Common worldwide, especially in quartz veins and pegmatites.