METALS, loo. Chromliim. 
3*3 
too CHROMIUM. White with a lhade of yel^ 
’ low, very brittle, fpecific gravity — : very 
difficult ot fulion: gradually oxyHating m the 
nitric acid, and the oxyde becoitiing green wneH 
heated iii a dole vcfiel. 
ferri. 
Red with a fltade of yellow and a fine oranee-yellow 
ftreak and powder, texture compadt, cryltallized m 
4-fided prifms. 
l^umbum hcxaedruKt. Sytl. nal. xii'. J. />• 1 34- 
Plumbum fulph. et arfeii. Wall. fyti. z p 309 » ». 
P umi.um luRi Uiti. Gmel./^n ti J 3. /. 367. ». 8. 
Red lead fpar. Kir^an miner 2. f. 214. 
Red lead ore. %chtne’J[p'r rmntr. 2. p 169. 
Chromat of lead. ’Thumjt>n<hem. p. 
Pound in the gold mine of BerejofntzT EkatermHkrg in ^iheria: 
the prifms are foniLtimes tirminatcd by 4-fided pyramids: 
lultrc or tranfparency hardly any : it is rather loft, wit an 
uneven fradurc. does not elFervtfce with acids, deciepitates 
before the blowp pe leaving a fmall portion of lead and a 
confiderable remainder of black flag which gives a green co- 
lour to borax: fpecific gravity from 57:0 106,029: con- 
tains, oxyde of lead 65,1 z. chromic acid 34,88. P' uquelm. 
Brown with an afliy-grey powder and flight mefa lie liif- 
trcj melted with potafs and diflolved in waier inipart- 
ing an orange-yellow colour to the folutio.i. 
Chromat of iron, thomjon them 4. p iz 6 . 
Found near Gajin in France, and in ^iieriai in irregular mafles: 
colour rcfembling that of brown blende: hardoef- lulHcient 
to fcratch glafs : infoluble in nitric acid, uid melts with 
borax into a fine green gU s: Ipecitic gravity 4,032 con- 
tains, chiomic acid 43,0* oxyde of iron 34,7. alumina 20,3; 
filica 2,0. f'auque/in. 
\ 
VOL. VII. — R r 
