Quartz Druze on Matrix

Physical Properties

Hardness: 7 on Mohs scale; Color: Yellowish-tan to clear; Luster: Vitreous to greasy; Crystal structure: Trigonal/Hexagonal; Cleavage: None/Conchoidal fracture; Specific gravity: 2.65

Formation & Geological History

Formed through hydrothermal processes where silica-rich fluids precipitate into cavities or fractures in a host rock (likely limestone or dolostone in this case). It could range from millions to hundreds of millions of years old depending on the local geology.

Uses & Applications

Primarily used for geological collection, decorative display, and metaphysical purposes. Industrial-grade quartz is used in electronics and glassmaking.

Geological Facts

The term 'druse' or 'druzy' refers to a coating of fine crystals on a rock surface. The yellow coloration is often due to iron oxide inclusions or surface staining from the surrounding soil/matrix.

Field Identification & Locations

Identify by its ability to scratch glass (high hardness) and the characteristic tiny, sparkling crystal faces. Commonly found in sedimentary basins or near volcanic activity. Collectors look for undamaged crystal terminations.

Identified on: 4/24/2026

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