21 
prase: it has hitherto been only found at KosemLitz 
in Silesia, accompanied by a siliceous earthy sub¬ 
stance called pimelite, which, like the chrysoprase, 
owes its green colour to oxide of nickel.—By way 
of appendix to the calcedonic substances, are added 
a few specimens of the less compound varieties of 
agates^ in which common calcedony, carnelian, and 
heliotrope respectively form the predominant ingre¬ 
dients.—Of flinty a well known mineral substance, 
several interesting varieties are deposited in this 
case. 
(Case 8.) contains principally opaline substances, 
viz. specimens of the noble opal, which owes its 
beautiful play of colours to a multiplicity of imper¬ 
ceptible fissures in its interior; the Mexican sun 
or fire opal; the common opal, a translucent white 
variety of which, appearing yellow or red when held 
between the eye and the light, is called girasol; the 
semi-opal, agreeing in its principal characters with 
the common; specimens of those varieties which, 
having the property of becoming transparent when 
immersed in water, are called hydrophanes, and vul¬ 
garly oculus mundi '; ivood-opal, or opalized wood ; 
jasp-opal, referred by some authors to jasper ; the 
menilite, called also liver-opal, found at Menil- 
Montant, near Paris, in a bed of adhesive slate, a 
specimen of which is added. Some varieties of ca- 
cholong may likewise be referred to the opal-tribe. 
•—The remainder of this case is occupied by the si¬ 
liceous 
SALOON. 
Nat. Hist. 
