whitlockite


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whitlockite

[′wit‚lä‚kīt]
(mineralogy)
Ca9(Mg,Fe)H(PO4)7 A rare mineral that forms hexagonal crystals.
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Adcock y Oliver Tschauner, del Departamento de Geociencias de la Universidad de Nevada, Las Vegas, publicada en Nature Communications, el 6 de marzo de este ano, bajo el titulo Shock-transformation of Whitlockite to Merrillite and the Implications for Meteoric Phosphate (Transformacion por impacto de whitlockita a merrillita y las implicaciones para el fosfato meteorico).
The mineral was formerly considered hard evidence that the ancient environment on the planet was dry and arid, but evidence showed some of it might have been converted from a different, wet mineral called whitlockite when asteroids hit the planet's surface.
The main mineralogical constituent of a rhinolith is formed by mineral whitlockite (Ca3 (PO4)2) and the remaining part is formed by carbonated apatite (dahllite) and mineral apatite (Ca5 (OH, F, CI) (PO4)3).
These usually consist of calcium stearate, whitlockite, or dahllite, as has been determined by previous chemical and mineral analyses (7, 8).
Phosphate minerals on Earth, like fluorapatite and whitlockite, take their time to dissolve, they are also not readily incorporated into a water-based solution, which is why their concentration are relatively low.
5 cm on siderite druses with quartz; white hexagonal-tabular crystals of whitlockite to 2 cm; lustrous pseudo-octahedral wardite crystals to 1.
Burnstein et al performed x-ray diffraction and chemical analyses of six parotid gland stones and found that the three major crystalline components were apatite, magnesium-substituted whitlockite, and octacalcium phosphate.
However, their relevance to biomineralization is clear considering the facts that [alpha]-TCP is easily hydrolyzed to OCP and that the mineral whitlockite, which is found in many biological mineralizations, has a structure very similar to that of [beta]-TCP (28).