516 Scientific Intelligence. 



Models illustrative of the simple Crystalline Forms ; by James B, 

 Jordan. London, 1921 (Thomas Mnrby and Co.). — This con- 

 sists of a series of charts giving in outline form figures from 

 which models of various simple crystals may be produced by 

 folding. Considering the difficulty and expense involved in 

 acquiring wooden crystal models at the present time pasteboard 

 models made in this way might prove very useful. w. e. f, 



7. New Mineral Names; by N^. E. Ford (communicated — con- 

 tinued from vol. 49, pp. 452-453, June 1920) :— 



Armangite. G. Aminoff and R. IVLiuzelius. Geol. For. 

 Forh. 42, 301, 1920. Hexagonal-rhombohedral. c == 1.3116. 

 Prismatic habit. H. = 4. G. = 4.23. Poor cleavage jj c (0001). 

 Color black. Streak brown. Optically — . Indices Yery high. 

 Comp. — Mn3(As03)2. Found in a coarse crystalline mixture of 

 calcite and barite from Langban, Sweden. 



Brannerite. F. L. Hess and R. C. Wells, Jour. Frankl. 

 Inst., 189, 225, 1920. In rough prismatic cr^^stals. Also granu- 

 lar. Color black with brownish j^ellow coating due to alteration. 

 Streak, dark greenish brown. Opaque. Conchoidal fracture. 

 H. — 4.5. G. = 4.5-5.4. oi = 2.30. Radioactive. Comp.— A 

 metatitanate, essentially (UO,TiO,U02)Ti03. Found in gold 

 placers in Stanley Basin, Idaho. Named after Dr. John C. 

 Branner. 



Cesarolite. H. Buttgenbach and C. Gillet, [Ann. Soc. Geol. 

 Belg.l, Amer. Min., 5, 211, 1920. In cellular masses. Color 

 steel-gray. H. == 4.5. G. = 5.29. Comp. — A manganate of lead, 

 HoBbMuoOs. Occurs with galena at Sidi-Amer-ben-Salem, Tunis. 

 Named after Prof. G. Cesaro. 



Dixenite. G. Flink, Geol. For. Forh., 42, 436, 1920. Hex- 

 agonal. As aggregations of thin folia, often radiating and some- 

 times in globular masses. H. = 3-4. Basal cleavage. Color 

 nearly black but red bv transmitted light. Luster resinous to 

 metallic. Uniaxial, +. '^ n = 1.96. Comp.— MnSi03.2Mn. (OH) 

 AsOg. Found associated with hematite, dolomite, and serpentine 

 at Langban, Sweden. Named from Si two and iivo<; stranger in 

 allusion to the unusual association of SiOs and AS2O3. 



Flagstaffite. F. N. Guild, Amer. Min., 5, 159, 1920. Ortho- 

 rhombic, a :1) :c = 1.2366 : 1 : 0.5957. In minute prismatic 

 crystals. Colorless and transparent, n = 1.51. G. = 1.092. 

 Comp.— CioHo.Og. Melts at 100°C. Very soluble in warm alco- 

 hol and recrystallizes on cooling. Found in the cracks of buried 

 tree trunks near Flagstaff, Arizona. 



Higginsite. Charles Palache and E. V. Shannon. Amer. 

 Min., 5, 155, 1920. Orthorhombic. a -.h : c = 0.6242 : 1 : 0.7940. 

 In small prismatic crystals with pvramid and dome terminations. 

 H. = 4.5. G. =4.33. n = 1.745. Ax. pi. || (010). Marked 

 pleochroism, X = green, Y = yellow-green, Z = blue-green. 

 Comp. — An arsenate of copper and calcium, CuCa(0H)As04. 

 Fusible at 3, coloring the flame at first pale blue and then blue- 



