What is Coral?
Coral is an organic material that is often found in tropical and subtropical oceans. It’s primarily used as a gemstone and is popular for its range of colors including red, pink, and white.
Coral is a unique gemstone that comes in a range of colors including red, pink, and white. Its vibrant hue and unique appearance make it a popular choice for jewelry and decorative items, especially beads and pendants.
|Chemical Classification||Organic - Calcium carbonate (from marine organisms)|
|Color||Coral can be white, pink, red, blue, black, and brown. The most prized is the deep red variety, often called 'ox blood.'|
|Streak||Dark Blue to Black|
|Luster||Waxy to dull.|
|Occurrence||Italy (especially the Mediterranean), Japan, and Taiwan.|
|Formation||Coral forms in tropical and subtropical ocean waters through the accumulation of calcareous skeletons of marine polyps.|
|Mohs Hardness||3 to 4.|
|Specific Gravity||2.60 to 2.70.|
|Diagnostic Properties||Organic, often red or pink.|
|Crystal System||Organic, not applicable|
|Optical Properties||Isotropic (due to its organic nature)|
|Birefringence||None (isotropic due to organic nature)|
|2V angle||Not applicable (organic)|
|Dispersion||Not applicable, as coral is organic.|