metamorphic
White Marble Spherical Bead
Recrystallized Calcite (CaCO3)
AI-generated identification · may be incorrectHardness: 3 on Mohs scale. Color: White with faint crystalline sugary texture. Luster: Pearly to dull. Crystal Structure: Trigonal. Cleavage: Rhombohedral (observed in grains). Specific Gravity: 2.71.
- Hardness
- 3 on Mohs scale
- Color
- White with faint crystalline sugary texture
- Luster
- Pearly to dull
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Physical properties
Hardness: 3 on Mohs scale. Color: White with faint crystalline sugary texture. Luster: Pearly to dull. Crystal Structure: Trigonal. Cleavage: Rhombohedral (observed in grains). Specific Gravity: 2.71.
Formation & geological history
Formed through the regional or contact metamorphism of limestone or dolostone. High heat and pressure cause the original carbonate mineral grains to recrystallize into an interlocking mosaic of calcite crystals.
Uses & applications
Used primarily in decorative applications, jewelry (as beads), architectural finishes, and sometimes as a physical therapy tool (Baoding balls) or game piece.
Geological facts
Pure white marble is the result of metamorphism of a very pure limestone. The sugary texture visible on the surface is characteristic of the interlocking calcite grains reflecting light.
Field identification & locations
Identify by its softness (can be scratched by a steel nail but not a fingernail) and its reaction to dilute hydrochloric acid (it will fizz). Commonly found in mountainous regions with a history of tectonic activity.
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