metamorphic
White Marble Pebble
Recrystallized Calcite (CaCO3)
Hardness: 3 (Mohs scale); Color: White with faint grey mottling; Luster: Sub-vitreous to pearly; Crystal structure: Trigonal/Hexagonal (granular); Cleavage: Perfect rhombohedral (not visible in pebble form); Specific gravity: 2.7
- Hardness
- 3 (Mohs scale)
- Color
- White with faint grey mottling
- Luster
- Sub-vitreous to pearly
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Physical properties
Hardness: 3 (Mohs scale); Color: White with faint grey mottling; Luster: Sub-vitreous to pearly; Crystal structure: Trigonal/Hexagonal (granular); Cleavage: Perfect rhombohedral (not visible in pebble form); Specific gravity: 2.7
Formation & geological history
Formed through the regional or contact metamorphism of limestone or dolostone. High heat and pressure cause the calcite grains to recrystallize into an interlocking mosaic. This specific shape is the result of mechanical weathering in a high-energy aquatic environment such as a beach or riverbed.
Uses & applications
Used in decorative landscaping, interior design accents, aquariums, and small-scale crafts. Historically, white marble is prized for sculpture and architecture.
Geological facts
Pure white marble is the result of metamorphism of a very pure (silicate-poor) limestone precursor. The famous Carrara marble from Italy has been used since Ancient Rome for iconic sculptures like Michelangelo's David.
Field identification & locations
Identify in the field by its softness (can be scratched by a steel knife) and its reaction to dilute hydrochloric acid (it will effervesce/fizz). Commonly found on Mediterranean beaches or near marble quarrying regions.
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