Liddicoatite, a new calcium end-member of the tourmaline group, ideally Ca(Li,Al)3Al6B3Si6O27(O,OH)3(OH,F), is rhombohedral, R3m, with a = 15.867(4), с = 7.135(4)A, and cell volume V = 1555.6(9)A3. Liddicoatite is the calcium analog of elbaite. It is a common mineral in the detrital soils of Antsirabe, Madagascar.

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