424 Scientific Intelligence. 
aluminiferous minerals. Sombrerite is not phosphorescent by heat like 
apatite; before the blowpipe, when moistened by su phuric acid, it 
colors the flame pale green. It contains no fluorid or chlorid of calcium. 
The specific gravity of sombrerite is 2°52. A well chosen specimen 
Pe 
has given me the following composition :— 
Atomic ratio. 
| sce cer setae 
Water, - . - - - - - . 9-0 100 820 
Phosphate of lime Oa?f, . - - - - - 65°00 041 8 
Phosphate of alumina AI?P3?, = - - - - 1700 005 1 
Carbonate of li - - - - - 5:00 
Chlorid of sodium, - - - - - - 1-44 
Sulphate of lime, RE ee SET Ts i ek 
ilica, - . . - - - - - - 1:00 
Crenate of ammonia, dc. - - : > - 0°20 
100-00 
t 
rock from Sombrero, we here insert the following observations on Dr. 
Phipson’s article, communicated to us by Mr. Alexis A. Julien, resedent 
J br 
proposal to distinguish the Sombrero guano as a new mineral species. 
€ commences by saying: “This mineral forms a large portion of 
some small islands in the West Indies, especially of Sombrero Island.” 
The only other islands in the West Indies, besides Sombrero, on which 
e rock guano has been found to oceur, are s, El Roque, ete., 
analyses show,” differs materially (except in general character) from that 
of the Sombrero guano, and altogether from the representative analysis 
hi 
I 
characters of the Sombrero guano given by Dr. Phipson, he says: 
It shows no signs of crystallization whatever, but appears like an 
amorphous gelatinous phosphate that has been submitted to a high tem- 
perature.” I have recently, however, discovered in certain localities 
¢ 
“ 
O 
of a great variety of colors, and containing, in addition to the 
ey 
xaiit, 120, 1857. Appleton's Ei 
ee age 
al, [2], xxii, 299, 1856. Proc. Phil. Acad. Nat. Sci. March, 1857. 
