270 Scientific Intelligence. 
Chester mineral is corundophilite; he has written Dr. J. Lawrence 
Smith to this effect (as cited in our Jast number), and other persons also, 
including one of the editors of this Journal; and he has distributed spe- 
cimens so labeled. And if he does no t know his own species, it may 
el 
been named without more knowledge.—,. p. p. 
11. Color of a diamond gine by heat.—In May last, Prof. Fremy 
exhibited to the Academy of Sciences at Paris a yellowish diamond, of 
the size and quality that otdieiarily sells for 12,000 dollars, which on 
being heated changes its color to rose-red; this color it retains for two 
or three days and then wredlially resumes the original yellow. On account 
of this peculiarity the actual value of the diamond was stated to be three 
times the amount above mentioned.—Les Mondes, p. 85, May 10, 1866. 
Gieseckite a result of the alteration of Eleeolite. —The view that the 
mineral oie ait found first in Greenland and some years since at 
0°33 p. c. of water on calcination, and entirely soluble in acids; along 
side of this, there are red spots where alteration has com menced ; an 
beyond, the mineral is changed to a brick-red uniform material, mostly 
opaque, with some translucent spots of unaltered elzolite. This red ma- 
terial afforded 5:90 p. c. of water, and dissolved only partially in dilute 
nitric acid, it yielding an abundant red precipitate. On separating the 
insoluble portion, by treatment with dilute cold nitric acid, this afforded, 
on analysis, $i 46°95, 31 34°65, Be 1°86, Mg 0°58, Ca 0°68, K 8°71, NaSi 
0°71, H 5°58—=99°72, thus rom that, besides taking up water, the 
soda of the elzolite had been replaced almost wholly by potash. os 
transformation of elzolite into gieseckite is similar in many respects 
at of cancrinite into bergmannite elucidated by Pisani and ne in 
1862 (Ann. de Ch. et Phys, Ixvii). The facts prove that these appar- 
ently crystallized minerals are actually pseudomorphs. Blum has ob- 
served a specimen of bergmannite with a nucleus of elzolite, == 
A pbiiyttite made by artificial means—BecquerE has observed 
that if distilled water is made to run ort over plates of sulphate of 
lime, the surface becomes chatoyant from the dissolving action of the 
water ; on if ws saturated solution of siibphiats of potash be employed 
instead a double sulphate of potash and lime is obtained, erys- 
tallized in seeded while with a solution of silicate of potash (marking 
0 to 10 raed degrees), instead of the —— pearly radiated 
