The researchers also measured the strontium in 170 plants and animals currently living near the caves to get a sense of the different strontium signatures of the region , including the thin malmani dolomite formation that includes both caves .
Since these " conventional " oxides consists of equal numbers of metal atoms and oxygen atoms , adding co2 creates a carbonate-calcite ( caco3 ) in the case of calcium , magnesite ( mgco3 ) in the case of magnesium , and dolomite in the case of a mixture of both .
" In its compounds calcium has valence2.it occurs in limestone , chalk , marble , dolomite , eggshells , pearls , coral , and many marine shells as calcium carbonate , or calcite ; in apatite as calcium phosphate ; in gypsum as calcium sulfate ; and in many other minerals . "