Third Supplement to Dana's Mineralogy. 258 



-2? 



i 



-4 



-2 



22 



42 



£2 



24 



44 



2i 

 U 



2i 



Andreasberg. 



-2/. 



33 



63 



-2 



2i 



4; 



4; 



2i 



American. 



[The symbols, for convenience of comparison, are made to correspond with those 

 in the Min p. 335 ; by substituting for the values of the axes a : b : c, 2a : b : 

 they are converted into those of Schroder. To show farther the relations of the 

 American crystals (figs. 489, 490, 491, 493 of Min.) a table of the planes is added, 

 the form being taken as monoclinic. ' In the American crystals, the prism of 

 115° 26' (7) is the dominant one, while in those of Europe, that of 16° 44' (i2) is 

 dominant.] 



Schroder gives the following values to some of the angles; I: 7=115° 19', 

 i2 : i2 = 76° 36', 22 : 22 (front) = 1 20° 58', -2 : -2 (front) = 131° 43', 0 :ii = 

 90° 7', 6>:2i = 135° 3', 0 : 22 = 141° 7', 0 : 22 = 147° 39', O:-2 = 130°7'. 



Dtallogite [p. 446]. — A variety from Oberneisen, named Himbeerzpath by 

 Breithaupt, and occurring in acute rhombohedrons with truncated summits, afforded 

 A. Birnbacher (Ann. Ch. u. Pharm. xcviii, 144): Carbonate of manganese 91*31, 

 carbonate of lime 5*71, carbonate of iron 3 06. 



Dolomite [p. 441, and Suppl. i, n], near Lettowitz, etc., Moravia, E. F. Glocker, 

 Jahrb. k. k. geol. Reichs., 1855, 98. 



Dufrenoysite [p. 77, and Suppl. i, n]. — Ch. Heusser desoribes this species anew 

 in Pogg. xcvii, 117. Forms : the dodecahedron (I) ; trapezohedron (2-2) ; cube with 

 the angles replaced by 2-2 ; cube with planes, I, 2-2 ; cube with planes I, 2-2, Q ; 

 cube with planes I, 2-2, 1 (octahedron), 6-6. Color on fresh fracture black, some- 

 times brownish or greenish ; streak cherry-red. Hardness a little above that of 

 fluor ; brittle. 



EpinoTE [p. 206, and Suppl. n], — Occurs in beautiful crystals at Roseville, Byram 

 Township, Sussex Co., New Jersey. — Kitchell's Geol. Rep., p. 171. 



Epsomite [p. 384]. — Occurs in Tennessee, at different places, and most remarka- 

 bly at the Alum Cave in Sevier, in a mountainous region on the head waters of the 

 West Fork of Little Pigeon river. Under the shelving rock, ("rock-house") masses 

 of nearly pure epsom salt, almost a cubic foot in volume, have been obtained. Saf- 

 ford's Rep., p. 119. — Also found at many places in Spain especially in the province 

 of Toledo, near Madrid. — Also formed at Vesuvius at the eruptions of 1850 and 

 1855. Scacchi, op. cit. p. 188. 



