Abstract

Analysis of a purified sample of the ludwigite yielded: B 2 O 3 16.84, MgO 35.77, FeO 8.16, MnO 0.16, Fe 2 O 3 36.77, Al 2 O 3 2.00, Ti O 2 0.10, SnO 2 0.20, CaO 0.14, H 2 O (super -) 0.02, H 2 O (super +) 0.00, Insol. 0.10, Sum 100.26. Calculated ratios: B 2 O 3 0.97, (Mg, Fe (super +2) , Mn) 4.02, (Fe (super +3) , Al, Ti, Sn) 1.01. Sp. Gr. 3.860. Rare single crystals with only prism {130} and with lower (4.76%) FeO content are at least 5 to 6 cm long and from half to a centimeter thick.

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