ii. 76 ABSTRACTS OF CHEMICAL PAPERS. Mi n e r a1 ogi c a1 Chemistry . Native Antimony from Kern County California. C. H. BEHRE JUN. (Amer. J. Xci. 1921 [v] 2 330-333).-A statement of the results of an examination of nodular masses of antimony with a crust of oxidation products. L. J. S . Identity of Flagstaffite with Terpin Hydrate. F. N. GUILD (Arner. Min. 1921 6 133-135).-A comparison of the crystal constants of flagstaffite (A 1921 ii 51) with those of terpin hydrate suggests the identity of these ; and this is confirmed by comparative tests made on the natural and artificial materials. Variable results for the m. p. are obtained owing to loss of water before melting. When heated very slowly the crystals soften at about loo" and finally melt near 116". Anhydrous terpin from flagstaffite has m.p. 105". The terpin hydrate formula C1,H,,02,H,0 is adopted since the material analysed had been partly dehydrated by remaining over sulphuric acid. The Natural Iron Hydroxides. KARL WILLMANN (Centr. Min. 1921 673-678).-A review is given of the colloidal and crystalline forms of iron hydroxides. The scaly (Rubinglimmer) m d acicular (Samtblende or needle-iron-ore) forms of goethite differ in optical characters and are regarded as dimorphous forms of Fe,O,,H,O. New analyses of Rubinglimmer from the Eleonore mine near Giessen gave Fe,O 89-90 H,O 10*77=100-67 and Fe,O 88.11 H,O 11.97=100-08 agreeing with this formula. L. J. S. I;. J. S.ANALYTICAL CHEMISTRY. ii. 77 Curite a New Radioactive Mineral. ALFRED SCHOEP (Compt. rend. 1921 173 1186-1187).-The new mineral is found at Kasolo Katanga Belgian Congo as translucent reddish- brown acicular crystals on torbernite or as compact or earthy masses and consists of minute needles with straight optical extinction. It is readily soluble in cold nitric acid and in hot hydrochloric acid; when heated it turns dark brown. Analysis gives the formula Pb0,5U0,,4H20. PbO. uo,. H,O. Fe,O,. Total. d" 21-32 74.22 4.00 0.17 99.7 1 7.192 L. J. S.