Corals: In comparison to the other precious stones and precious metals corals are not minerals, they have got an organic origin. They are coelenterates which emit calcium carbonate and this forms a skeleton, the coral. The chemical formula is CaCO3. The hardness is about 2.5 to 3. Corals are white or red. Because of their organic origin some conditions must be fulfiled that corals can grow. It is important that the water is warm. The Mediterranean and tropic areas are good for corals. To have enough coelenterates the water has to be warm. Corals are fragile and they have got a rough surface, but they change, when they are polished. When we compare raw and processed corals they are not similar to each other. In the antiquity there were made jewels of corals, too.

Data about Corals

Chemical formula CaCO3

Mineral class carbonates

Crystal system skeleton of coelenterates

Hardness 2,5 to 3

Density 2.6 g/cm3

Color white, rose, red, grey

Line color white

Gloss glass gloss

Break shell

Fissileness none

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