mineral
Quartz (Yellow / Citrine Quartz Pebble)
Silicon Dioxide (SiO2)
Hardness: 7 on Mohs scale. Color: Pale yellow to light tan, translucent. Luster: Vitreous to greasy. Crystal structure: Hexagonal / Trigonal. Cleavage: None (conchoidal fracture). Specific gravity: 2.65.
- Hardness
- 7 on Mohs scale
- Color
- Pale yellow to light tan, translucent
- Luster
- Vitreous to greasy
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Physical properties
Hardness: 7 on Mohs scale. Color: Pale yellow to light tan, translucent. Luster: Vitreous to greasy. Crystal structure: Hexagonal / Trigonal. Cleavage: None (conchoidal fracture). Specific gravity: 2.65.
Formation & geological history
Formed in igneous, metamorphic, or sedimentary environments, often found as weathered pebbles in riverbeds or gravel. Citrine coloration typically results from micro-inclusions of iron hydroxides or natural radiation exposure.
Uses & applications
Commonly used in lapidary work, wire-wrapping, gravel, sand production, and crystal healing collections.
Geological facts
Quartz is the second most abundant mineral in Earth's continental crust. Small water-worn quartz pebbles are often called 'river quartz' or 'gurney stones'.
Field identification & locations
Identify in the field by checking if it scratches steel/glass (hardness 7) and lacks true cleavage. Widely found worldwide in riverbeds, beaches, and pegmatite deposits.
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