metamorphic
Yellow Quartzite Pebble
Quartzite (primarily SiO2)
Hardness: 7 (Mohs scale); Color: Yellow-tan to light brown; Luster: Waxy to vitreous; Crystal structure: Trigonal/Microcrystalline; Cleavage: None; Specific gravity: 2.63 - 2.65
- Hardness
- 7 (Mohs scale)
- Color
- Yellow-tan to light brown
- Luster
- Waxy to vitreous
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Physical properties
Hardness: 7 (Mohs scale); Color: Yellow-tan to light brown; Luster: Waxy to vitreous; Crystal structure: Trigonal/Microcrystalline; Cleavage: None; Specific gravity: 2.63 - 2.65
Formation & geological history
Formed through the metamorphism of quartz sandstone. Intense heat and pressure cause quartz grains to recrystallize and fuse together. The yellow tint is often due to iron oxide impurities.
Uses & applications
Used as decorative river stone, in landscaping, as a building material, and occasionally for lapidary work like tumbling.
Geological facts
Quartzite is so durable that it often survives intense weathering that destroys other rocks, meaning it is frequently found as rounded river pebbles far from its source.
Field identification & locations
Identify by its hardness (it will scratch glass) and its sugary, crystalline texture when broken. Commonly found in riverbeds, glacial deposits, and mountain ranges.
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