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Wednesday, 25. May 2011

Calcium carbonate

By 2562sad, 06:16

Natural pearls are nearly 100% calcium carbonate and conchiolin. It is thought that natural pearls form under a set of accidental conditions when a microscopic intruder or parasite enters a bivalve mollusk, and settles inside the shell. The mollusk, being irritated by the intruder, forms a pearl sac of external mantle tissue cells and secretes the calcium carbonate and conchiolin to cover the irritant. This secretion process is repeated many times, thus producing a pearl.jewellery manufacturers Natural pearls come in many shapes, with perfectly round ones being comparatively rare.Mr. Mckenic

Typically, the build-up of a natural pearl consists of a brown central zone formed by columnar calcium carbonate (usually calcite, sometimes columnar aragonite) and a yellowish to white outer zone consisting of nacre (tabular aragonite).tahitian pearl In a pearl cross-section such as the diagram, these two different materials can be seen.

(1) cools down: The tapioca is cool, has cools down the function. If is the internal heat is quite heavy (tongue coating yellow, eye red, frequently anxious and so on situations), takes the tapioca to have the very good alleviation function. Moreover, the internal heat is excessively prosperous also causes the smallpox smallpox's important attribute, to this kind of smallpox smallpox, the internal medicine tapioca's effect is very good.

Earl oyster branch animal Ma earl oyster Pteria martensii (Dunker), or freshwater mussel branch animal triangle sail freshwater mussel Hyriopsis cumingii (Lea), cristaria plicata Cristaria plicata (Leach) and so on double shell class animal.

 Wears the pearl necklace to treat the chronic pharyngolaryngitis and the armor high (thyroid function hyperfunction sickness) has certain effect. wears the pearl necklace for a long time, may cause the pharyngolaryngitis patient's cough to reduce,golden south sea pearl even dead stop. Wears frequently human, not easily pharyngolaryngitis. the armor high patient wears the pearl necklace, may suppress the tumour to grow up, and causes it to vanish gradually. wears the pearl necklace for a long time, may alleviate the short temper which cerebral concussion sequela creates, the improvement temperament odd appeases anger the variable symptom.

The presence of columnar calcium carbonate rich in organic material indicates juvenile mantle tissue that formed during the early stage of pearl development.freshwater pearl Displaced living cells with a well-defined task may continue to perform their function in their new location, often resulting in a cyst. Such displacement may occur via an injury. The fragile rim of the shell is exposed and is prone to damage and injury. Crabs, other predators and parasites such as worm larvae may produce traumatic attacks and cause injuries in which some external mantle tissue cells are disconnected from their layer. Embedded in the conjunctive tissue of the mantle, these cells may survive and form a small pocket in which they continue to secrete their natural product: calcium carbonate.