_ here figured. P on M = 94.* Also 
_ Massive, in the Juvenas stone. 
that of Chassigny and many others. Fig. 2. 
lime, or magnesia. It is found in small quantity, diffused through 
chladnite in the stone from Bishopville. 
‘21. Anorthite-—In exceedingly mi- Fig. 1. 
nute, transparent crystals of the form 
22. Chladnite, ( Shepard.) —-This 
Species is named in honor of Chladni, 
the scientific founder of this depart- 
ment of knowledge. It-occurs in im- 
perfect crystals, some of which are nearly an inch in diameter, 
whose’ primary form is a doubly oblique prism. Their general 
figure approaches very closely to that of some of the most usual 
forms of feldspar and albite. ‘The natural faces are too rough to 
allow of measurement. By cleavage, which is effected with great 
facility, angles of 120° and 60° are readily obtained. . Color snow- 
ite, rarely with a tinge of grey. buettt pearly to vitreous. 
Translucent, (in i-transparent.) H. 
='6°0...6-5, Very brittle. Masses half an inch in diameter are 
easily crushed between the fingers. Sp. gr. = 3-116. Alone 
before the blowpipe on charcoal, it fuses without difficulty and 
with phosphorescence, into a white enamel ; with borax very slow- 
ly, into a transparent glass. It is a ter-silicate of magnesia. It 
forms more than two-thirds of the Bishopville stone. 
23. Pyroxene.—This species is found in 
very distinct, black erystals in the Juvenas 
stone, havitig the form of the figure in the 
Margin (Rose). It likewise occurs in large 
Stained, greenish black, individuals in the 
Stannern stone, and of a pearl-grey color in 
24. Chantonnite( Shepard ).—Named from 
the ‘Chantonnay stone, in which it is found, 
& compact, black veins and angular 
Shaped masses. Fracture subconchoidal. H. = 65...7-0. Sp. 
St. = 3-48. Before the blowpipe, it melts on the edges into a 
dull, black slag. 
- G. Rose had observed twin- esas of this mineral in the Juvenas stone, 
e Ch. 
. had a bed’ suggested that they. belonged to the species Labradorite. Ann. d 
et de Phys, Tom. xxxi, p. 81. 
