Rock Identifier
Quartz-rich crystalline rock, likely drusy quartz on matrix (Quartz (SiO₂), possibly intergrown with calcite or feldspar matrix) — mineral
mineral

Quartz-rich crystalline rock, likely drusy quartz on matrix

Quartz (SiO₂), possibly intergrown with calcite or feldspar matrix

AI-generated identification · may be incorrect

Colorless to gray, translucent-to-transparent granular crystals with a glassy luster; quartz hardness is 7 Mohs, lacks cleavage, and has hexagonal crystal structure. Exact identification is limited by the photograph; gray matrix minerals may be softer and show cleavage.

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Physical properties

Colorless to gray, translucent-to-transparent granular crystals with a glassy luster; quartz hardness is 7 Mohs, lacks cleavage, and has hexagonal crystal structure. Exact identification is limited by the photograph; gray matrix minerals may be softer and show cleavage.

Formation & geological history

Likely formed when silica-rich hydrothermal fluids filled a cavity or fracture and deposited a coating of small quartz crystals, potentially during low-temperature vein formation. Geological age cannot be determined visually and depends on locality.

Uses & applications

Used mainly as a mineral specimen or lapidary material; quartz has broad industrial uses in glass, electronics, abrasives, and engineered stone. Fine drusy specimens may be used in jewelry and display.

Geological facts

The sparkling surface is characteristic of drusy quartz, an aggregate of many tiny crystals rather than one large crystal. Quartz commonly develops on amethyst, agate, limestone, and metallic-ore veins.

Field identification & locations

Identify with a glassy sparkle, hardness sufficient to scratch ordinary glass, and no reaction to dilute hydrochloric acid; acid fizz would suggest calcite instead. Common worldwide in hydrothermal veins and geodes.