dolomite

The mineral that took scientists more than 200 years to recreate
Calcium magnesium carbonate, chemical formula CaMg(CO3)2, accounts for about 2% of the Earth's crust and takes hundreds of millions of years to form naturally.
Decipher the mysterious
The mystery about one
The ocean used to have very little oxygen
The existence of special minerals in ancient coral reefs shows that 650 million years ago, Earth's oceans had very little oxygen, according to Australian researchers on August 17.