metamorphic
Marble (Sculculpted)
Metamorphosed Limestone (primarily CaCO3)
Hardness: 3-4 (Mohs scale); Color: White with orange/red iron staining; Luster: Vitreous to waxy; Crystal Structure: Trigonal/Hexagonal (calcite); Specific Gravity: 2.7
- Hardness
- 3-4 (Mohs scale)
- Color
- White with orange/red iron staining
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 3-4 (Mohs scale); Color: White with orange/red iron staining; Luster: Vitreous to waxy; Crystal Structure: Trigonal/Hexagonal (calcite); Specific Gravity: 2.7
Formation & geological history
Formed through the regional or contact metamorphism of limestone or dolostone. High heat and pressure cause the recrystallization of carbonate minerals into a dense, interlocking mosaic of calcite grains.
Uses & applications
Commonly used in sculpture, architecture (flooring, countertops), and as a decorative stone for figurines and ornaments.
Geological facts
The characteristic colored veins in marble are actually impurities like clay, silt, sand, or iron oxides that were present as layers or grains within the original limestone.
Field identification & locations
Identify in the field by its softness (can be scratched by steel) and a strong effervescent reaction when exposed to dilute hydrochloric acid. It is commonly found in mountainous regions where tectonic activity occurs.
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