Geology and Mineralogy. 467 
in compact granular masses, rarely crystallized. H. a little less 
than 4; G. 48; luster metallic ; grayish-steel colored. An 
analysis by Dr. Fildaro gave, after deducting 2°2 p. ¢. SiO, and 
calculating to 100: Sb 27:00, 8 31°23, Cu 20° 39, Fe 13° 37, Ni ie 97, 
A . 
n tr. = 100. 
Duscatisenen: Found vi apets ab in ray cr Posen grains in 
the gneiss of Beaunan, valle t zeron, south-east of Lyons. 
It has a bright blue color, and "aha he se ecific pravity ie 3: 36. It has 
been examined chemically b y M. Damour, and shown to . a 
silicate of aluminum, with perhaps the composition oe [SiO 
this point, however, is not entirely established. Bertrand 
finds that it has distinctive optical characters ie to those of 
andalusite. 
1 n the mineral Dawsonite from Tuscany.—The rare species 
dawantiie: described by Dr. Harrington in 1874 as occurring 
sparingly near ——— nas been found by M. Chaper at Piau 
Castagnaio in Tuscany and has been arb eriert np by M. Friedel. 
It is found in thin plates aaa and formed of fine fibers in a 
0, 3 
This irienyfonte closely with the results of Harrington 
but the material in hand seems to have been nee This analysis 
agrees closely writh the formula Na,[Al,|C,O,+2H,O, which may 
be vie ahs CO,) +(ALC,0,) +2(H,[Al,]O . — Bull. Soc. Min. 
4 
5. aichinim exige Jrom Cordoba, Argentine Republic.— 
The occurrence of vanadium minerals at several points in the State 
of Cordoba has been described by Brackebusch tsi Especies 
Minerales ef la Republica Argentina, 1879). pe of des- 
tite, the crystals being highly aotitied and showing the planes, 
i-2, 1, 2-2, an 3-3. ammelsberg ( ye8., XXxii, 709) © 
has analyzed the descloizite and obtained for dark colored cr ys-. 
tals, G. = 6:080: V,O, 22°74, PbO 56:48, ZnO 16°60, MnO 1°16, 
H,O 2-34, Cl 0°24, “This corresponds es the formula R,V,O, or 
N04 RH,O, with R=Pb: Zn=1: 1, and makes the species 
anwlopots in composition to olivenite and libethenite. . 
Occurring with the descloizite and vanadinite is a mineral in 
small black striated prismatic crystals, for which Dr. Doring pro- 
OSes eae name Brackebuschite. An analysis by him yielded :— 
5°32, P,O, 0°18, PbO 61:00, MnO 4°77, FeO 4°65, ZnO 1°29, 
Curd > 42, H O02 2'03=99'66. For this 5 Rammelsberg calculates the 
formula R, v. ,O, +aq., which (Mn: Fe=1:1) req ‘ res:—V,O, 2 
PbO 6 62°09, MnO 4:95, FeO 5-01, HO 2-50—10 
16. Zinn: Hine  peolopiasl Siena hidhidie Mono- 
