: . 
4 
5 
J. B. Pearse on Minerals of the Chlorite Group. 221 
Art. XXI.—On some Minerals of the Chlorite Group; by JOHN 
B. PEARSE. | 
of which there are three kinds—one colored pure — a ve 
. The fol- 
The mineral is in distinct crystals. There is the strongest evi- 
dence that all belong to the trimetric system, closely resembling 
i e 
truncated pyramid, but the lateral surfaces are so striated as to 
be incapable of measurement. ramid is made up of a 
. The hardness of the green and red is 2°75; the specific grav- 
ity of the green at 64° Fahr. 2°355, that of the red 2:383, which 
micaceous plates, with a vitreous lustre, and white streak. | Here 
blowpipe reactions show the presence of chrome, and silica, the 
— bsence of fluorine in 
the green. Traces of the alkalies were shown in the red. Both 
Fresh 
and perfect crystals were used for ea t. 
Same variety, in Srdat to certify undeniably the composition. 
M. JOUR. Sci.—Suconp Series, VoL. XXXVII, No. 110.—Mancu, 1864. 
29 
