Calcium is element 20, it is a metal and part of group 2 in the periodic table. It is in the second column of the periodic table which as a group surprisingly has the greatest number of elements that play a part in biology: Magnesium, Calcium, Strontium and Barium all play an essential part in the complex chemistry of life.
Calcium is the normal metal which in the form of a hydrated Calcium Phosphate is the main component of mammalian bones, yet the Calcium ion is somewhat small to fit perfectly into the crystal lattice of bone, and its lower group 2 neighbor Strontium would fit much better due to its larger size and in fact will do so if the opportunity arises. Calcium is also an essential element in blood, so much so that it is suspected that the very formation of bones in early evolution originated in the need to have a Calcium reserve to draw upon when blood levels decrease. Even before Calcium levels are getting low, the body will have already borrowed it from the bones. Of course later in evolution, these bones acquired their current purpose of bodily structure and support for muscles, and movement.
Atoms of the element Calcium are constantly in motion and on the move in the body, moving in and out of cells, making the activity in both nerves and muscles possible. Although we might think of Calcium as a symbol of rocks and mountains, of which indeed it is also a major part, in life it represents a dynamic force first of all and makes movement possible, both in minds and bodies.
Calcium is relatively abundant on Earth, but it does not occur naturally in its elemental metallic from, for being too unstable in air. As a carbonate however it is very abundant in rocks, especially sedimentary rocks, which are layers of deposited remainders of life, mostly shells and corals. These layered rocks can be found in many places and forms, the most famous perhaps being the white or bleak yellowish rocks on the cliffs of both sides of the Channel between England and France.
All the properties mentioned before, motion and immobility, layered structures as if in frozen motion, can be found in the music of Calcium.
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