and Laboratory Methods. 1313 



Optical character negative, y (pract. equal /i) = 1.582, a = 1.554, y — a = 

 0.28 (by Wallerant on Quarter-Gaillard material. Author finds double refraction 

 variable from 0.02 to .0.03. 



The mineral occurs in an argillaceous band in a bed of coal at the Fontannes 

 pits. L. McI. L. 



Farrington, 0. C. Publications Field Colum- Liesite. Crystals of the rare mineral, ine- 



bian Museum. Geol. Series,!: 221-241. site, from San Cayetano mine near Villa 

 Feb. 1900. ^ 



' Corona, Durango, Mexico, exhibit the 



following forms (100), (010), (001), (201), (Ott), (11.0.12), and (946), of which the 



two latter are new. An analysis recalculated to 100 per cent, gave the following : 



100. 100. 



from which the formula H^CMn . Ca)gSigOit, + SHgO is deduced. 

 ^ Caledonite. Crystallographic examination of the rare mineral, caledonite, from 

 the Stevenson-Bennett mine, Organ Mts., near Las Cruces, New Mexico. Eight 

 forms were identified and from measurements in the zone of the basal and macro- 

 pinacoids, the author concludes that the crystals are orthorhombic. 



Gay-liissite. Examination of microscopic crystals of gay-lussite from Sweet- 

 water Valley near Independence Rock, Wyoming. 



Epso7nite. Crystals of epsomite from Wilcox Station, Wyoming, described. 



Golden Calcite. Calcite crystals from concretions of the Fort Pierre shale of 

 the Bad Lands, South Dakota, described. Distorted crystals with the rhombohe- 

 dron, -2 as the dominant form. 



Dolomite used as I)idian Money. Perforated cylinders of dolomite from near 

 Lakeport, Lake county, California. A partial analysis gave CaO 28.27 ; MgO 

 22.46, Fe 1.18, which percentages are near those of normal dolomite. 



Crystal Forms of Calcite, frofn Joplin, Mo. A crystallographic study of the 

 calcites of this interesting mineral locality. The author distinguishes five types 

 of crystals with the following forms. R, 4, -i, -f, -|, -2, -4, -11, -20, If, 1^ 

 ■| 2, i ^ of which il, -20, is new for calcite. Twin crystals are described with O, 

 and -\ as twinning planes, those with the latter twinning planes resembling some 

 from Guanajuato, Mexico, described by Pirrson. a. f. r. 



Palache, Charles. The Crystallization of Cal- An exhaustive Study of the calcite crys- 

 cite, from the Copper Mines of Lake ^^^^ ^f l^j^^ Superior, which perhaps in 

 Superior. Geol. Surv. Mich. : 161-184, 1900. ^ ^ r r 



symmetry and beauty rival those of 

 any other locality. Eighty-seven forms with eight doubtful ones are described 

 in detail. Of these thirty-two are described as new, but //' <j ll.l.To.O \- was 

 previously given by Schnorr. (Abstr. Zeit. f. Kryst. 30.660) and (J -\ 4.20.27.17 \- 

 minus \^ to f power by Sansoni (Giorn. Min. 1.136). 



Crystals twinned according to the tw^o laws O, and —\ are described. 

 A gnomonic projection of all the forms adds to the value of the paper. 

 Details of the measurements, which were for the most part made on the two-circle 

 goniometer, are to be given in a forthcoming number of the Zeitschrift fiir Krys- 

 tallographie. a. f. r. 



