424 The American Naturalist. 
Kioto, has the following refractive indices and optical angles for yellow 
light: § = 1.6182, y= 1.6252, 2 V = 62° 40’, 2E= 114° 31’. The 
crystal from New South Wales has 2 E = 113° 18’. 
Mineralogical News.—Stéver announces the discovery of fine 
celestites in the Jurassic schists of Brousseval in France. Their axial 
ratio is .7803 : 1: 1.2826, and index of refraction for sodium light = 
1.6235. The crystals are one centimeter in length, and are elongated 
parallel to 4. Similarly habited crystals occur also in the marl of 
Ville-sur-Sault. The axial ratio of these is .7806 : 1: 1.2797, and den- 
sity == 3.991. 
Rheineck” has made another attempt to calculate from the published 
analyses general formulas for tourmaline that will not only represe 
the composition of all varieties of the mineral, but which will also ex 
press its relationship with micas. He concludes that there are two 
alkaline varieties, viz.: Al, Si, B H,O, and Al, Si, B, H, Om and two 
magnesium varieties, Al, Si, B, Mg,O,, and Al, Si, B, Mg, Om by 
whose intermingling all other varieties are formed. ` 
Several crystallographic observations of Baumhauer™ areof interest. 
A yellow diopside from the Canton of Graubünden (Grisons), Bae 
land, has an axial ratio a:b:e — 1.0918: 1:.5879, with A =" 
127 15”. Binnite crystals from Infeld in the Binnenthal are certainly 
tetartohedrally hemihedral, as the author has succeeded in finding upor 
- them, well-developed, the planes $ and 222. 4 
Oebbecke” mentions the occurrence of topaz with feldspar, apatite 
tourmaline, fluorite, ete, at Epprechtstein and its existence in the gran- 
ite of the Gregnitzgrund in the Fichtelgebirge. ich 
The arsenopyrite of Weiler in Alsace occurs in an arkose from whi 
Scherer” has obtained crystals sufficiently large for measurement © 
analysis. These crystals are prismatic in habit, and have. s TT 
ratio a : b:¢ = .6734 : 1 : 1.1847. A mean of two analyses gave fig: 
ures corresponding to Fe : S: As — 1 : .9933 :.9751. ‘ 
Mallard™ has come into the possession of some beautiful pane 
tals of periclase that were found implanted on a white compact ¢ 
produced in the culcination of some of the Stassfurt materials. pov 
Several twins of aragonite from the tunnel of Neussargues 10 
” Zeits. f£. Kryst., XXII, p. 52. 
E XXI, p. 200. 
” Ib., XXII, p: 278. 
AID, XXII, p. 62. 
“ Bull. Soc. Franc. Min., XVI, p. 18. 
