igneous
Quartz Pebble (with Feldspar/Mica)
Granitic Quartz / SiO2 with KAlSi3O8
Hardness: 6-7 on Mohs scale. Color: Off-white to pale pink with dark speckles. Luster: Vitreous to dull/waxy. Fracture: Conchoidal to uneven.
- Hardness
- 6-7 on Mohs scale
- Color
- Off-white to pale pink with dark speckles
- Luster
- Vitreous to dull/waxy
Identified More igneous →
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Physical properties
Hardness: 6-7 on Mohs scale. Color: Off-white to pale pink with dark speckles. Luster: Vitreous to dull/waxy. Fracture: Conchoidal to uneven.
Formation & geological history
Formed from the weathering and erosion of granitic igneous or metamorphic rocks containing quartz, potassium feldspar, and minor accessory minerals such as mica.
Uses & applications
Commonly used as gravel, landscape stone, construction aggregate, and as general rock specimen collections.
Geological facts
Quartz is one of the most abundant minerals on Earth's surface and is extremely resistant to both chemical and mechanical weathering, allowing it to survive stream transport as rounded pebbles.
Field identification & locations
Identified by its light color, hardness (scratches glass), and translucent milky to pinkish appearance. Found in riverbeds, beach gravels, and glacial till worldwide.
