woodhouseite

woodhouseite

[′wu̇d‚hau̇‚sīt]
(mineralogy)
CaA13(PO4)(SO4)(OH)6 A colorless to flesh-colored or white, hexagonal mineral consisting of a basic sulfate-phosphate of calcium and aluminum; occurs in small crystals and tabular form.
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For example, he made in-depth studies of the mineralogy of the now-famous Brumado mine in Bahia, recovering countless superb crystal specimens of uvite, dolomite, hematite, magnesite and Japan-law twinned quartz, as well as rarities such as chernovite, agardite-(Y), florencite-(Ce), woodhouseite and svanbergite among many others.
Variation in the composition, including significant substitutions of calcium, phosphorus and vanadium, account for the atypical color; some specimens have historically been misidentified as woodhouseite. The most typical occurrence for the species is as massive, cream-white, finely crystalline veinlets to 5 cm thickness.
Woodhouseite: purplish pink crystalline masses have been shown microchemically to be very impure alunite.