Ca ae 
the ale varieties, the appearance of innumerable 
flaw 
Tts tranfparency varies from aeioed tran{parent to tranf- 
lucent at the edg and a flight degree of cioudine {s 
er than quartz, and its hardnefs appears to be in 
a ratio with i its purity and tranfparency. 
It is brittle, and eafily eae 
efs pena: to the varying 
arften.—4.2 30 
ule of ir 
We polite the adie ring analyfes of the noble garnet. 
Klaproth. 
Silica 5:75 
ee 27.25 
Oxyd of 36.0 
Oxyd oa man ne 6.25 
Lofs “ag 
100 
~ Vanquelin, according to Haily, found 02 parts of what 
he terms the trapezoidal red garnet of Bohemia to contain, 
filica 36, alumine 22, lime 3, oxyd of iron 41 ; and the com- 
pofition of {mall dodecahedral red garnet cryftals, from 
ee near Barége, the fame diftinguifhed chemift fates 
Hg be 52, alumine 20, oxyd oe iron 17, lime 7.7, 
S 3. 3. 
The lift of the localities of rd a ee net, as it is given in 
the fyftems of Mineralogy, e depended upon ; 
moft o Wri adi 
iters aeons 
suality, i is ne well known to miflead; and we fufpect that 
the epithet Surian or Syrian, given to the noble garnet ( es 
which is probably derived from Soranus, a name applie 
the middle ages to ae ie ftone or — has firit cated 
Pegu (a town of which is called 
troduced into > the a of die localities of this 
5 
found, the following may a mentioned: Norway ; cues 
Fahlun, Grapenberg) ; Greenland; Scotland (Aber- 
0 Soe” and cl ee 
oo aoe i earn 
Saxo 
: itis found i in mica ‘flate, chlorite flate, in hc nblende 
- a s and granite it occurs but fe idom. 
A pecereae of any particular minera 
repofitory, fuch as veins 
he noble garnet ie polithed and cut like the more valua- 
ble precious _ ee ufed for ornamental purpofes. There 
re alfo fome engravings to be feen in it, both modern and 
canes ‘OF the latter we-mention inffar pmnium, the Dog. 
ourfon, above Trafcuaire, in the Simplon 
. Noble garnets and pyrope garnets, that have, by de- 
compofition, loft their natural sere eaeil friable, 
are fometimes improperly called unripe g. 
4. The primitive form of tlic eee 18 €Xa: meatly the fame as 
that of the cells of bees: the polyhedron exhibited by thefe 
two bodies is that which offers moft capacity with the leaft 
furface. Haiiy. 
Sub-fpecies 2. —Pyrepe las a bila D ; mee 
mian- garnet. It hasnot yet been found cry ut 
only in {mall and eee ee ane aed iad pieces.. 
Its ra is eg ood-red, Cw g blackith r ed in 
the . la ieee ally its luftre is ftrong; it is 
iar aed cou Its fr afore is conc ioe more 
perfeCily fo than that of the noble garnet : it is completely 
tranfparent. Hardnefs and nea gravity between thofe of 
re common - noble gar. fp. gr. 3.941, Werner; 
3-718, Klap 
Its pee eieens is nearly that of the noble garnet; 
from which it differs, however, according to sp aeiee 8 anas 
a in having magnefia for one of its component parts 
ilica 40.00 
Alumina 28.50 
ee 10.00 
3.50 
Oxjdo of ir 16.50 
Oxyd of alee 0.25 
Lois 1.25 
Klaproth’s Beitr. vol. it 
—. 
x 
‘The pyrope is s almoft entirely confined to the fictz- -trap 
formation. In the Bohe emian middle -mountains Mero- 
nitz, Podfe dhitz 
es ifh-grey kind of wac eles aa among bafaltic boulders 
and contritus ¥ the fame, lying. immediately under a ftratum 
of marle. t Ely in Fifefhire, Scotland, it is, according 
to Jame f the fand e fea-fhore, ro- 
ae derived a om the eee fletz-trap rocks. At 
feparate.it en ce other precious. gar aay 
. In Bohemia, the pyrope and noble garnets conftitute an 
article of commerce of the greater importance, as they pro- 
eople, who have no 
“a 
