LOUISITE—LOUIS. 15 
What, I have here stated is for the most part not new, but a 
confirmation of former notice. 
Art, II].—A New Minera (LOvIsITE), FROM Biomipoy, N. S., 
By H. Louts, Assoc. Royal School of Mines, London. 
(Read December 9, 1878.) 
H.=65 G. 2.41. Vitreous. Leck-green. Translucent. 
Streak and powder white. Fracture splintery. Brittle. 
Diff. B. B. In an open tube yields water and becomes pale 
brown. On platinum wire fuses to a white vesicular enamel. 
It gelatinises in and is completely decomposed by hydrochloric 
acid. 
ANALYSIS. 
Sl OS emer ee Wet ee aie Siiie dl Oe de 
AU ge. ces « Pace he A : See OU 
He Ov. ed a OM ees Jat st ays 3 eon 5) 
Nie OR. Sos AAA : . trace 
(Sat Oe ate ae ae En ei a” oe Wy fv f 
I Oe fo oP tera) sige cw otats scat aja: Ose 
miehoewtmeseits OOS 
mFS earerc nde EL 
99.63 
The formula appears to be, 12 Si O, 4 Ca O 9 Hz O or perhaps, 
3 Si O2 Ca O 2 He O. 
Considering the water as basic, the latter formula may be 
written. 3 Si Oz R O. 2 Mz O where R O=Ca O Fe O Mg O and 
Mg OH, O Kz O Nag O, 
The latter is, I think, the better view to take of its composition. 
Nore.—The Mineral was picked up by Mr. Robert Starr, of Cornwallis, when I was examining 
the Geology of Blomidon. I have suggested the name Louisite, in consideration of Mr. Louis's 
kindness in undertaking to analyse it. Prof. Dana remarks in refereuce to its composition, that 
if all the silica in it is combined, and none of it free, there is nothing like it in mineralogy.-— 
Mr. Louis says that the silica is all combined, 
Mr. Louis exhibited a beautiful specimen of Crystallization in 
