1890.] Mineralogy and Petrography. 1075 
two metallic elements of different kinds, while in the former the metal 
is of but one kind. A full list of forms that have been discovered in 
dolomite is incorporated in the descriptive part of the paper.——Mr. 
Kemp * communicates a few notes on some peculiar calcite crystals, 
and also on tourmalines, sphenes, and magnetites that have been sub- 
jected to pressure. The magnetite is striated asa result of the pressure, 
which has produced a parting apparently parallel to O and »» O. The 
minerals were found in the vicinity of Port Henry and Mineville, N. Y. 
A new analysis of Cornwall connellite by Penfield ® shows it to be 
analogous in composition to the new mineral spangolite. Its formula 
may be written Cu, (CIOH),SO, 4- 15H,0.—— The hexagonal tables 
of eisenglimmer in the sunstone of Tvedestrand, and in the carnallite 
of Strassfurt are pleochroic, according to Rinne,” with #>e. The 
colors are yellow and dark brown. As the result of several analyses 
Jannettaz !? concludes that oriental zuzguorse is colored by phosphate 
of copper, while the color of the occidental turquoise is of organic 
origin and due to phosphate of iron (vivianite). The Atan-olivine 
of Damour (from Pfunden, in the Tyrol) thought by Descloizeaux 
to be orthorhombic, has been examined optically by Lacroix,” and 
found to be monoclinic. Its thin section is pleochroic in yellowish 
and reddish-yellow tints. It is polysynthetically twinned, and its optical 
angle 2V—62? 18’. It is, therefore, intermediate in character between 
olivine and the minerals of the humite group. At the lower extrem- 
ities of stalactites of zesqueAonmife ® pseudomorphs after Jansfordite 
from Lansford, Pa., Genth and Penfield?! have discovered crystallo- 
graphic planes which enable them to work out very satisfactorily the 
crystallization of the original mineral, which is found to be triclinic 
with a:b: c==.5493: 1: .5655.——The similarity in properties be- 
tween agalite from northern New York and bastite seems to indicate 
that the former mineral is an altered enstatite.*———Giirich*® has re- 
cently published alist of the minerals occurring in the German pos- 
sessions of Southwestern Africa. The list embraces about fifty-five 
species, and these are separated into groups, according as they occur 
15 Amer. Jour. Sci., July, 1890, p. 62. 
15 Ib., July, 1890, p. 83. 
VU Neues Jahr. f. Min., etc., 1890, I., p. 193. 
18 Bull. Soc. Fran, d. Min., 1890, p. 106. 
19 Ib., XIII., 1890, p. 15. 
20 AMERICAN NATURALIST, April, 1889, p. 261. 
214m. Jour. Sci., Feb., 1890, p. 128. 
X Scheibe. Zeits. d. Deutsch. Geol. Ges., 1890, XLI., p. 564- 
28 Neues Jahrb. f. Min., 1890, 1.,p. 103. 
