19 
of common calcedony^ the most remarkable are, 
the smalt-blue variety from Felsobanya in Tran¬ 
sylvania, crystallized in cubes •, the branched 
and stalactical calcedony from Iceland, &c.; 
the botryoidal from Ferroe; nodules including 
water (enhydrites) from Monte Berico, near 
Vicenza, where they occur in volcanic rocks : 
cut and polished pieces of calcedony, with black 
and red dendritic and other figures, commonly 
called mocha stones; varieties with white, brown , 
and black, straight or curved lines ; onyx, sar¬ 
donyx, &c. 
Case 7 . Calcedonic substances continued. 
Among these are various specimens of the red 
and yellowish varieties of calcedony, called cor¬ 
nelian : striped carnelians, &c.— Heliotrope^ an 
intimate mixture of calcedony and green earth, 
which, when containing disseminated particles 
of red jasper, is commonly termed blood-stone. 
—The beautiful and much esteemed variety of 
calcedony, called chrysoprase: it has hitherto 
been only found at Kosemiitz in Silesia, accom¬ 
panied by a siliceous earthy substance called 
pimelite, which, like the chrysoprase, owes its 
green colour to oxide of nickel.—By way of ap¬ 
pendix to the calcedonic substances, are added 
a few specimens of the less compound varieties 
of agates^ in which common calcedony, carne- 
lian, and heliotrope respectively form the pre¬ 
dominant ingredients. [See also Room 1. 
Table 2.]— Oii flinty a well known mineral sub- 
c 2 stance. 
SALOON. 
Nat. Hist. 
