Calcium is probably the answer you seek.
However, it also has a lot of phosphorus as well as zinc, potassium, iron, magnesium, manganese and traces of copper, selenium and strontium.
Calcium
Each known mineral has a specific chemical composition.
its not a mineral
The color of a mineral sample is determined by its chemical composition
Several minerals are evaporites, and therefore, there is not just one mineral composition but a different one for each mineral.
the composition of luster is limstone
it means a naturally-occaring, inorganic solid that has a crystal structure and a definite chemical composition
BMC stands for Bone Mineral Content. It is a measurement used in body composition analysis to assess the amount of mineral content in bones, providing information about bone density and strength.
I would say ceramic, since they crawl in the sand, but any living thing, as well as bones are made out of carbon. So if you can relate a conch to the bone then the inorganic composition of bone (bone mineral) is formed from carbonated hydroxyapatite.
Hydroxylapatite is the mineral substance in bone. It is a calcium compound.
white clay or Kaolin (which is a clay mineral with the chemical composition Al2Si2O5(OH)4). Other materials mixed with China clay to make porcelain clay have included feldspar, ball-clay, glass, bone ash, steatite, quartz, petuntse and alabaster.
And their texture, which can be aphanitic, phaneritic, glassy, or porphyritic. mineral composition and crystal texture