1816.) Scientific Intelligence. 403 
It occurs in plates about two lines in thickness. Lustre, dull 5 
sometimes glimmering. Fracture, even, earthy. Opake. Semi- 
hard. Does not scratch glass. Has a strong clayey taste. 
The following table exhibits the result of the various analyses that 
have been made of the lazulite, of ultra-marine, of hauyne, and of 
the blue mineral from Vesuvius. 
iia Blue mine- 
Lazulite. : ral from Hauyne. 
: marines | Vesuvius. : 
‘ + + § Be 
BANICH et sees. c.f) 46°0 49-0 35°8 AT*1 30°0 | 35°38 
pA amine, 6 ones 0000255 14°5 11-0 34:8 18-5 15:0 | 18-87 
TOBSTION oo < fone teas — 20 — _ — — 
MMI acess fe caiciae ds > 18-3 16:0 16 54 15°4 | 11-62 
WOES. o's oe see oe a 8:0 — 64 11-0 | 15°45 
BORG ries os posers oeens hy om Trace } 23:2 — _ — 
Oxide of iron........ 3:0 4-0 _ 13°7 10! 116 
Oxide of manganese..| — _ Trace — est 
Sulphuric acid ....... 37 2°0 a 1-2 116 | 12°77 
Sulphureted hydrogen ,.| Trace | Trace 31 1:0? | Trace | Trace 
Carbonic acid........ 12°5 — 15 1-0? — —— 
Water..... Br. ae ae 20 Trace — Trace — 1-00 
SRIAIBED. 1. n> aches bs 35 100 92°0 100 94°3 87 96:35 
ee 8 NE ne akg Se es te eed ie: 
From the preceding analysis, supposing it accurate, it is obvious 
that the blue mineral from Vesuvius is specifically different from 
hauyne. Besides, the external characters, as far as they can be 
made out from the preceding imperfect description, which I have 
translated from Leopold Gmelin, show us that the two minerals do 
not resemble each other. 
XIV. Anhydrite from Ilefeld, in the Harz. 
Stromeyer has lately analyzed an anhydrite from Tlefeld, in the 
Harz, and found its constituents as follows :— 
BRIDE. veCiniecsnenasansctncecnercy 4061S 
Sulphuric acid.............0000085 55°80] 
Carbonic acid 6... secesccscecvsses  OO8T 
Oxide OF 1rOD occ cccccecccce nie rosy 
CG, rev ng ce tts Se he ie ca OS) 
MU as el mame cue hos out O40 
WME vadaasecese comet errs lle OOS 
RR OE a ek ee Tne 
100°000 
* Klaproth, Beitrage, yol. i. p. 196. 
+ Gmelin, Schweigger’s Journal, vol. xiv. p. 981, | 
} Clement and Desormes, Ann, de Chim, vol, lvii. p, 317. 
§ Gmelin, Schweigger’s Journal, vol, xiv. p, 325, 
} Vauquelin, Jour, de Mines, No, exxv. p,. 365, 
** Annals of Philosophy, vol, iv. p. 198. ; 
