sedimentary
Banded Calcite (often marketed as Caribbean Calcite)
Calcium Carbonate (CaCO3) + Aragonite
Hardness: 3 on Mohs scale; Color: Light blue/green to white; Luster: Vitreous to waxy; Crystal structure: Trigonal/Orthorhombic; Cleavage: Perfect rhombohedral; Specific gravity: 2.71
- Hardness
- 3 on Mohs scale
- Color
- Light blue/green to white
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 3 on Mohs scale; Color: Light blue/green to white; Luster: Vitreous to waxy; Crystal structure: Trigonal/Orthorhombic; Cleavage: Perfect rhombohedral; Specific gravity: 2.71
Formation & geological history
Formed through chemical precipitation in sedimentary environments, often found in caves or near hot springs. This specific blue-green variety is typically sourced from Pakistan and is geologically very recent.
Uses & applications
Predominantly used for ornamental purposes, lapidary art, and holistic 'crystal healing' markets. Its low hardness makes it unsuitable for heavy-wear jewelry but excellent for carvings and tumbled stones.
Geological facts
Initially discovered in 2019 in Pakistan, it gained rapid popularity on social media due to its 'beach-like' appearance. It is distinctive for its combination of blue calcite and white/brown aragonite layers.
Field identification & locations
Identify in the field by its softness (it can be scratched by a copper coin or steel knife) and its habit of forming in banded veins. It will effervesce (fizz) if a small amount of household vinegar (weak acid) is applied.
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