254 Account of some new Vesuvian Minerals 
and peridot, it is known, because these minerals do not form 
from all these species: the facility with which it fuses, and 
its primitive form, distinguish it particularly from the three 
first. Amphibole and grammatite have a different primitive 
ish yellow. 
ZURLITE. 
Specific characters. 
Geometrical Characters. The primitive form, according 
to Ramondini, the discoverer, isa cube ; but according to the 
i uthors, a rectangular prism of the same dimensions as the 
ast 
Physical Characters. Sp. gr. 2.274. 
It does not scratch glass—is scratched by the knife. The 
raspings have the gray colour of clear pearl. he fracture 
is granular—lamellar, t and dull—the lamellz 
ve 1 and ering to n cale spar. 
acters. 
fore the blowpipe, the i i whi 
f greenish splinters, which are the 
least impure, melt by a strong heat, with partial efferves- 
cence, point changes to a Sreenish yellow translucent 
enamel, compact when the effervescence is finished, but vesic- 
In the system — Haiiy, malacolite and pyroxene belong to the same 
