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Mineralogical ClassificationOttensite (IMA 2006-014) published
25th Jan 2007 12:30 UTCJim Ferraiolo
Ottensite was found on specimens from the Qinglong antimony deposit in Guizhou Province, where it occurs as crusts of red-brown spheres up to 0.3 mm in diameter on well-formed terminated crystals of stibnite. It is uniaxial positive with ncalc 1.99, weak orange-red to red pleochroism; H. ~ 3½, Dcalc 4.14 g/cm3. EPMA gave Na2O 7.44, K2O 0.10, Sb2O3 84.64, S 7.43, H2O (from TG) 4.60, less S = O 3.71, = 100.50, corresponding with an idealized formula Na3(Sb2O3)3(SbS3)• 3H2O. Indexed XRD powder data are tabulated; strongest lines 2.906(100), 2.991(80), 12.29(60), 4.64(50), 4.12(50), 2.679(50) Å; a 14.1758, c 5.5712 Å, V 969.57 Å3, Z = 2, space group P63. Ottensite is a supergene product of stibnite weathering and is the Na-dominant analogue of cetineite. The name is in honour of Berthold Ottens (born 1942), mineral collector from Spiegelau, Germany, for his numerous papers on Chinese mineral localities.
A companion paper, "A note on the paragenesis of ottensite", M.J.Origlieri, et al., Min Rec. 38, 83-84(2007), notes ottensite was originally thought to be cetineite, and all the specimens previously identified as cetineite from China may actually be ottensite. Mopungite is finely intermixed with the ottensite.
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