sedimentary
Caribbean Calcite
Calcium Carbonate (CaCO3) with Aragonite (CaCO3)
Hardness: 3 on Mohs scale; Color: Light blue, seafoam green, and white; Luster: Vitreous to waxy; Crystal structure: Trigonal/Orthorhombic mix; Cleavage: Perfect rhombohedral; Specific Gravity: 2.71
- Hardness
- 3 on Mohs scale
- Color
- Light blue, seafoam green, and white
- Luster
- Vitreous to waxy
Identified More sedimentary →
Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Hardness: 3 on Mohs scale; Color: Light blue, seafoam green, and white; Luster: Vitreous to waxy; Crystal structure: Trigonal/Orthorhombic mix; Cleavage: Perfect rhombohedral; Specific Gravity: 2.71
Formation & geological history
Formed through sedimentary processes involving the precipitation of calcium carbonate in marine or hydrothermal environments. This specific combination was recently discovered in Pakistan around 2019.
Uses & applications
Primarily used for lapidary work, decorative carvings (like the heart shape shown), jewelry, and by mineral collectors for its unique aesthetic appeal.
Geological facts
Despite its name, it is not found in the Caribbean; it is named for its color which resembles the Caribbean Sea. It is a unique combination of blue calcite and brownish-white aragonite.
Field identification & locations
Identify by its distinctive pastel blue color contrasted with white/sand-colored banding or pockets. It is relatively soft and can be scratched by a copper coin. Mostly found in Pakistan.
More like this
Other sedimentary specimens
Sandstone or Siltstone
Arenite (if sandstone)
Sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Shale or Slaty Mudstone
Argillaceous sedimentary rock
sedimentary
Chert Breccia
Brecciated Chert (Microcrystalline Silica)
sedimentary
Sandstone (Quartz-rich)
Arenite (SiO2)
sedimentary
Sandstone (with man-made markings)
Arenite (composed primarily of Quartz, SiO2)
sedimentary