mineral
Quartz / Calcite Pebble
SiO2 (Quartz) or CaCO3 (Calcite)
Hardness: 7 for Quartz, 3 for Calcite; Color: Off-white to pale tan with irregular dark inclusions; Luster: Vitreous to dull/earthy; Texture: Granular to fine-grained, uneven surface with small crevices.
- Hardness
- 7 for Quartz, 3 for Calcite
- Color
- Off-white to pale tan with irregular dark inclusions
- Luster
- Vitreous to dull/earthy
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Physical properties
Hardness: 7 for Quartz, 3 for Calcite; Color: Off-white to pale tan with irregular dark inclusions; Luster: Vitreous to dull/earthy; Texture: Granular to fine-grained, uneven surface with small crevices.
Formation & geological history
Formed either through hydrothermal fluid deposition (quartz/calcite veins) or sedimentary precipitation/metamorphism, subsequently weathered and rounded into a small pebble.
Uses & applications
Common decorative stone, gravel aggregate, landscaping material, or simple pocket specimen for collectors.
Geological facts
Rough white pebbles like this are among the most widespread rock fragments found in stream beds, gravel driveways, and beach deposits worldwide.
Field identification & locations
To distinguish quartz from calcite, test hardness with a steel nail (scratches calcite, not quartz) or drop vinegar on it (calcite fizzes, quartz does not). Highly ubiquitous in nature.
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