Dr Anderson’s Account of new Mineral Species. 149 
microcosmic salt, if well neutralized, it gives after cooling a 
green glass which becomes darker with tin. The composi- 
tion is 
Tantalic acid, : : : 49.66 
Titanic acid, . : A 7.94 
Yttria, : 25.09 
Protox. of Uranium, . “oe 6.34 
— — Cerium, : “ 2.18 
Ox. of lantanium, : : 0.96 
Lime, : : : ; 2.47 
Magnesia, . : ; 0.29 
Water, : 3 ‘ i 3.97 
98.90 
Leucophane.—This mineral, which is found on a small rock 
near the mouth of the Langesundfjord in Norway, was dis- 
covered by Esmark, and analyzed by Erdmann. It occurs in 
syenite along with albite, elaolite, yttrotantalite, and another 
new mineral named Mosandrite. Leucophane is seldom regu- 
larly crystallized, but has three distinct cleavages. When 
cleaved it gives four-sided prisms, with angles of 53°.24’.7, and 
86°.26'.3, which appear to belong to the triclinometric system. 
Colour varies from pale impure green to dark wine yellow. In 
thin plates it is colourless. It gives a bluish phosphorescent 
light, and becomes slightly electric when heated. Hardness 
nearly that of fluor-spar. Sp. gr. 2.974. Melts before the blow- 
pipe into a clear, somewhat violet enamel. With borax gives 
a clear amethyst glass ; with a little soda it gives an opaque 
giobule ; with more it melts into the charcoal ; with micro- 
cosmic salt in a tube it gives fluosilicie acid gas. Its compo- 
sition is 
Silicie acid, : F 47.82 
Glucina, 4 3 ade ee 
Lime, E , ; 25.00 
Protox. mangan., : : 1.01 
Potassium, : - 0.26 
Sodium, - : : 7.59 
Fluorine, . 3 : 6.17 
99.36 
Mosandrite.—This mineral was found by Erdmann along with 
