470 Scientific Intelligence. 



structure. The color is ash-gray or light greenish and bluish 

 with satin luster; hardness 2-5; specific gravity 2'91. The 

 empirical formula deduced is H 2 Ca 4 Mg 3 Si 2 O 7 F 10 , which may be 

 written 5RF 2 .2RSi0 3 .H 2 0.— Zeitschr. Kryst., xlii, 209. 



Stilpnochloran is an alteration-product of thuringite described 

 by Kretschmer from the iron mines of Gobitschau near Stern- 

 berg, Moravia. It forms aggregations of small cleavable scales, 

 sometimes irregularly grouped, also radiated or fan-shaped. The 

 color is yellow to bronze-red ; hardness 2 to 3 ; specific gravity 

 1*82. An analysis gave : 



Si0 2 A1 2 3 Fe 2 3 MnO CaO MgO H 2 P 2 5 



33-30 4-37 44-33 0-34 1-22 1-73 14'10 037 = 99'76 



The formula calculated is H 24 (Ca, Mg) (Al, Fe) 10 Si 9 O 4fi .— CentralbL 

 Min., p. 203, 1905. 



Moravite is a chloritic mineral closely resembling thuringite, 

 also described by Kretschmer from a locality near Gobitschau 

 (see above). An analysis gave : 



Si0 2 A1 2 3 Fe 2 3 FeO CaO MgO K 2 0,Na 2 H 2 C P 2 5 



49-30 22-71 5-04 13-99 tr. 1-82 1'10 4'95 0*55 tr. = 99'46 



The formula deduced is H 4 (Fe, Mg) 2 (Al, Fe) 4 Si 7 24 .— CentralbL 

 Min., p. 293, 1906. 



Paravivianite is a variety of vivianite containing small 

 amounts of manganese (2*01 p. c. MnO) and magnesia (1*92 MgO), 

 described by S. Popoff from the limonite deposits of the Penin- 

 sula Kertsch. 



The same author has given the name Kertschenite to a 

 hydrated basic iron phosphate from the same region. This occurs 

 in dark green to black crystalline aggregates with a hardness of 

 3*5 and specific gravity of 2*65. The mean of two analyses gave: 



P 2 5 Fe 2 3 FeO MnO MgO CaO H 2 



28-20 32-93 9-49 1-92 1'55 0-47 24-98 = 99-54 



The calculated formula is (Fe, Mn, Mg) Fe 2 P 2 O )0 .7H 2 O. — Cen- 

 tralbL Min. K p. 112, 1906. 



Otavite is a new cadmium mineral described by O. Schneider 

 from Otavi in German Southwest Africa. It occurs in crystal- 

 line crusts with upper and lower surfaces covered with minute 

 rhombohedrons. The color is white to reddish and the luster 

 brilliant adamantine. Qualitative tests lead to the conclusion 

 that it is a basic carbonate of cadmium. The same locality 

 yields azurite, malachite, cerussite, linarite, etc., also greenockite 

 as a yellow powder on malachite.— CentralbL Min., p. 388, 1906. 



Chlormanganokalite is a name provisionally given by H. J. 

 Johnston-Lavis to a double chloride of manganese and potassium 

 occurring in canary-yellow rhombohedral crystals in cavities in 

 ejected masses found on the flanks of Vesuvius after the eruption 

 of last April. Nature, lxxiv, 103. Associated with this are fine 

 cubes of a potassium-sodium chloride corresponding to 6KC1. 

 NaCl, which the same author calls Chlornatrokalite. 



