Yellow Quartzite Pebble

Physical Properties

Hardness: 7 (Mohs scale); Color: Yellow/Tan; Luster: Vitreous to dull; Crystal structure: Trigonal (microcrystalline); Cleavage: None/Conchoidal fracture; Specific gravity: 2.6-2.7

Formation & Geological History

Formed through the metamorphism of quartz-rich sandstone under intense heat and pressure. This specific specimen has been further smoothed by fluvial (river) or coastal erosion, creating a 'river stone' texture.

Uses & Applications

Used primarily in decorative landscaping, aquarium gravel, as a construction aggregate, or as a pocket stone for collectors.

Geological Facts

Quartzite is so hard and chemically resistant that it often forms the caprock or peaks of mountain ranges. It is tougher than the sandstone it originated from because the individual sand grains have recrystallized and fused together.

Field Identification & Locations

Identify in the field by its inability to be scratched by steel, its sugary texture if broken, and its lack of reaction to acid. It is found globally in mountainous regions or riverbeds.

Identified on: 4/13/2026

Mode: Standard