Yellow Quartzite (Citrine-colored Quartz)

Physical Properties

Hardness: 7 (Mohs scale); Color: Pale yellow to honey-amber; Luster: Vitreous to waxy; Crystal structure: Trigonal/Hexagonal (though usually massive/granular); Cleavage: None, exhibits conchoidal fracture; Specific Gravity: 2.65.

Formation & Geological History

Formed through the metamorphism of quartz-rich sandstone. Under intense heat and pressure, the individual quartz grains recrystallize into a locked interlocking mosaic of crystals. The yellow coloration is often due to trace iron inclusions.

Uses & Applications

Used primarily in construction as decorative stone, crushed stone for road beds, and landscaping. High-quality translucent pieces are used in lapidary for carvings or as tumbled stones for collectors and 'healing stone' markets.

Geological Facts

Quartzite is so tough that it often survives intense weathering better than the rocks surrounding it, resulting in high ridges or hills. This specimen shows water-worn smoothing, suggesting a fluvial (river) origin.

Field Identification & Locations

Identify by its ability to scratch glass (hardness) and the lack of reaction to acid. In the field, it is distinguished from calcite by hardness and from sandstone by the fact that it breaks across grain boundaries rather than around them.

Identified on: 4/23/2026

Mode: Standard