Quartz with Mica inclusions (likely Iron-stained)

Physical Properties

Hardness: 7 (Quartz stays scratch-free from steel); Color: Yellow-orange (iron staining) with greyish-black inclusions; Luster: Vitreous to greasy; Crystal Structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture).

Formation & Geological History

Formed in hydrothermal veins and pegmatites through the cooling of silica-rich fluids. The dark inclusions represent other minerals like biotite or muscovite mica that formed simultaneously.

Uses & Applications

Common industrial uses include glass making and electronics. In this rough form, it is primarily a collector's specimen or used for tumbling.

Geological Facts

Quartz is one of the most abundant minerals in Earth's crust. The yellow-orange tint is often caused by microscopic iron oxide (limonite or hematite) coating the crystal boundaries.

Field Identification & Locations

Identify by its ability to scratch glass and lack of cleavage. Look for the irregular, glass-like fracture surfaces and the mica's characteristic flaky or 'sparkly' appearance in sunlight.

Identified on: 4/13/2026

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