Clades:
Carbonates.
Chemical: CaCO3;
Calcium carbonate.
MineralogySedimentary rock consisting chiefly of calcite, more than 95%, with or without magnesium carbonate, less than 5% dolomite.
Limestones are formed by either organic or inorganic processes, and may be detrital, chemical, oolitic, earthy, crystalline, or recrystallized.
Many are highly fossiliferous and clearly represent ancient shell banks or coral reefs.
Limestones include:-
Chalk,
- Calcarenite,
- Coquina
- Travertine
- Silica, chalcedony.
-
Feldspar-
Clays-
Pyrite- Siderite.