366 Supplement J9 Dana’s Mineralf&y. 
121° 15’. In fact no mica affords satanic for the presage ty. rism (if not 
=: an a other ange but 120° and its ore 60°; this is angle of 
the basal cleavage sectio in all cases. seless to consider a er "theoreti 
mentioned by B thaupts for Kenngott writ tere made no such argument if he 
had been aware ‘of the facts. 
The error as to the optical characters arose from the examination of too thin a 
te. 
The annexed figures b 
% 
8 
2 ¥s 
ES.s. 
<5 
= 
s 
* 
jor) 
moreover are very similar 
to the phlogopite of = 
wards, Pope's Mills, 
other localities, as ow wri- 
has especially observed. 
rs 11 
appear to occur in idocrase, while th e latter is  ubatiamare of garnet. There is 
here a subject for further investigatio 
It i 
unnecessary to follow Kennett in his review of the analyses —p.] 
Picranatorme [p. 318]—The crystals of picranalcime, a specimen of which the 
writer has received from E. Bechi, are as clear and glassy as any analeime and show 
no i oie of alteration.—p, 
Prronstone [p. 248 —The e of Delesse 
Siehice ge fe Steere St. Natolia, Sardinia, afforded 
S Al Fe n "th Mz K Na _ Hand organic 
6259 1659 317 055 116 226 648 314 390= = 99°83. 
Resembles a black pitch and is associated with trachyte 
A review Ff bag ina of pitchstone is given by Scherer, Handw. Chem. Ligh 
Pogg., &c., 18. See also Fluolite. 
PITKARANDITE—* A paramorphie amphibole species,” Scheerer, P 
Xciii, 100. biti that of augite. Calor leek-gr + zen, light a dark. From aca 
in Finland. Composition according to R. Richte 
Si 
Al Fe Mn be Mg Ht 
6125... 04> =1PH .. 088 917. 1330 re = 10019 
Oxygen, 31°80 019 2°82 018 2°62 5°32 
whence Scheerer deduces the oxygen ratio for the silica and gee 3198 pire 
=11:4. [Excluding the water the ratio is 31°80: 10-94 go es 12: 43: ed 
taking for the eae weight of silica 566° 88. bina is most y adopted, 1 it 
becomes 32°45: 10-94, which is very closely 3:1, the ratio of some steatite. —p.l 
Prarina moet og 12] ee ant Pisa is not a pr of Plata, silver, but signi 
fies sil of Bogota, Inaug. Dissert. 
* Both the Vrooman’s Lake and Stoned Sokgs jneisins, oni Satta 
micas are of similar character, Sak eeioseix Spegeteel ees ee 
specimen came from Natural Bridge—o. 
