x 
© Amer. Jour. Sci., Feb., 1891, p. 141. 
_ from the Devil’s Mining Region, in Idaho, Mr. Melville ® has 
_ ered a mineral resembling scheelite in external appearance, but 
ing from it in composition. The crystals are small, prismatic, 8 
yellow in color, with a hardness of 3.5, and a density of 4.526 
374 The American Naturalist. 
Hebron, Me., turns out upon analysis to be apatite with a tabul 
habit. i 
- New Minerals.—A new borate has been discovered imbedded in 
the form of small, colorless, transparent, or milky-white crystals in t 
pinnolite of Stassfurt, Germany. The crystals are monoclinic, with 
12’. The forms observed are tac 5 ae: —P, rm Po, and —3P3 
perpendicular to the plane of symmetry, and makes with ¢ an angl of 
7° in acute 8. A= 5. 2Hya—=104° 27. The composition of 
substance, as found by Baurath, is: 
B,O, MgO K,O Na,O Cl. HO 
52.13 13.80 8.14 -39 -35 232 
which corresponds to H,Mg,K(BO,),+6H,O. The name Hin 
has been given it by Milch8 The same mineral is described 
the mineral is easily soluble in hydrochloric and nitric acids. A 
analysis yielded results different from those above given, as follow 
B,O= 60.53; MgO = 12.23; K,O = 7.39; H,O = 19.85. Themel 
chosen by Leudecke have the ratios a@:5:c== 1.2912: 1: 1.7572 
to #Pcoo. The refractive index for sodium light vibrating 
to 4 is 1.354. The other optical properties coincide with those: 
termined by Milch. Prof. Groth suggests that neither of the 
names suggested for the mineral be accepted until it is found 1 
analysis is correct. ——Powe//ite.—In a weathered fragment of bot 
have a resinous lustre, and are semi- -transparent and brittle. 
ments of angles indicate a tetragonal symmétry with a: c= 1 ; 
The planes appearing oP, P, Poo, and œP. The composition is 
MoO, WO, SiO, CuO MgO Fe, O, AlO; on 
58.58 10. 28 325 26.55 -1p -65 
23 Zeits. f. Kryst., XVIIL., 1890, P- 479- 
ten 
