mineral
Quartz (Rose Quartz / Quartz Pebble)
Silicon Dioxide (SiO2)
Hardness: 7 on Mohs scale. Color: Pale pinkish-tan to beige. Luster: Vitreous to dull/waxy when weathered. Crystal structure: Hexagonal/trigonal. Cleavage: None (conchoidal to uneven fracture). Specific gravity: ~2.65.
- Hardness
- 7 on Mohs scale
- Color
- Pale pinkish-tan to beige
- Luster
- Vitreous to dull/waxy when weathered
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Physical properties
Hardness: 7 on Mohs scale. Color: Pale pinkish-tan to beige. Luster: Vitreous to dull/waxy when weathered. Crystal structure: Hexagonal/trigonal. Cleavage: None (conchoidal to uneven fracture). Specific gravity: ~2.65.
Formation & geological history
Formed in igneous pegmatites or hydrothermal veins where silica-rich fluids cool and crystallize. Over time, natural water erosion smooths the rock into a rounded river pebble.
Uses & applications
Used in lapidary work, decorative landscaping, mineral collecting, and as tumbling rough.
Geological facts
Natural stream action frequently shapes quartz pebbles into heart-like or ovoid forms. Pink hues in quartz are usually caused by microscopic trace inclusions of dumortierite or titanium/manganese impurities.
Field identification & locations
Identify by its hardness (scratches glass readily and cannot be scratched by steel) and lack of cleavage. Common in stream beds, beaches, and gravel pits worldwide.
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