Yellow Quartzite (River Pebble)

Physical Properties

Hardness: 7 (Mohs scale), Color: Yellow to honey-gold, Luster: Vitreous to waxy, Crystal structure: Hexagonal (microcrystalline), Cleavage: None (conchoidal fracture), Specific Gravity: 2.6 – 2.7.

Formation & Geological History

Formed through the metamorphism of quartz sandstone under high heat and pressure. This specific specimen shows alluvial weathering, meaning it was rounded by river transport over geological time.

Uses & Applications

Used in landscaping, as tumbling rough for lapidary work, in construction as aggregate, and occasionally in jewelry as cabochons.

Geological Facts

Quartzite is so durable that it can survive long-distance transport in rivers and along coasts, often outlasting the softer rocks that once surrounded it.

Field Identification & Locations

Identify in the field by its hardness (will scratch glass easily) and smooth, rounded surface indicating water wear. It is commonly found in riverbeds and glacial deposits.

Identified on: 4/22/2026

Mode: Standard