EARTHS. PONDEROUS. 6. Barytes. 
7 * 
ORDER II. PONDEROUS. 
Containing a larger portion of ponderous earth. 
6. BARYTES. Confiding almoft entirely of pon- 
derous earth ; ponderous, parafitic, very brittle, 
harfh to the touch, foft ; entirely Ibluble in boil- 
ing fulphuric acid, in the fire at firft deprived of 
the cohefion of its parts, and afterwards melting 
without ebullition. 
A. Combined with carbonic acid gas, which does not totally 
dijengage itjelf during liiufadiion, and therefore ep- 
fervpcing with acids. 
^itherin- Of a common figure and equal texture. 
S"- Barolite. Witheriie, Ktrwan mineral, i. />. 134- 
Carbonate of Baryt. lichmeijjer mineral. l. p. 253. 
Carbonat of Barytes. ‘Ihomjm s chemifiry, ■>,. p.tZQ. 
Found at Angle/.ark near Chotley in Lancajhire, near Sc. Afapii 
in IFaks, and in Argylcfliire in Scotland, in folid mafl’es and. 
cryftallized ; texture fhining, radicated, fibrous; colour 
greenifli-white or white: its cryftals are fmail 6-fided pnfms 
terminated by 6-fided pyramids : when heated it becomes 
opakc. Its pov\der phofphorelccs when thrown on buining 
coals: contains barytes 62. carbonic acid 22, water i6. 
^ellosa. Lamellar, of a cryftaliirie figure, fcmipellucid, fmooth oa 
the outer furface, (liining within, 
t. With 4-fided obliquangled falcicled prifms. 
2. With 6-fided prifms, terminated at both ends by a 6.fided py. 
. ramid, • l c 
3. With 4 fided obliquangled tablet, the terminal margins obtule 
with an acicular point. 
4. With 6-fided double pyramids. 
Carbonate of Barytes. So-werby Brit, minerals, tab. 76, 
Found in Scotland, Lancajhire, Torkfiire, and Saxony, in folii 
mafies; colour white, with a degree of tranfparency. 
B. Saturated with fulphuric acid, and therefore not efer- 
vejcing ivith acids: Jhining in the dark, after having 
been whitened tn the pre. 
‘^‘■restris. Friable, in an earthy loofc or united form. 
Barofclenitc in an earthy ioofc form. Kir-wan, i. p.t 38. 
Ponderous earth Caw k, or friable heavy Spar. Schm.l, p. 2 ^$. ’ 
Earthy fulphatof Barytes. Thotn,oni chem, 3. p.hzz., 
