Category Organic mineral Color White, pale yellow | Strunz classification 10.AC.15 | |
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Formula(repeating unit) [Ca3(C6H5O7)2(H2O)2]·2H2O Crystal system TriclinicUnknown space group Unit cell a = 5.9466(4), b = 10.2247(8)c = 16.6496(13) [Å]; Z = 2 | ||
Earlandite [Ca3(C6H5O7)2(H2O)2]·2H2O is the mineral form of calcium citrate tetrahydrate. It was first reported in 1936 and named after the English microscopist Arthur Earland FRSE. Earlandite occurs as warty fine-grained nodules ca. 1 mm in size in bottom sediments of the Weddell Sea, off Antarctica. Its crystal symmetry was first assigned as orthorhombic, then as monoclinic, and finally as triclinic.
References
Earlandite Wikipedia(Text) CC BY-SA