EARTHS. PONDEROUS. 6. Barytes. 71 



ORDER II. PONDEROUS. 



Containing a larger portion of ponderous earth. 



6. BARYTES. Confiding almoft entirely of pon- 

 derous earth : ponderous, parafitic, very bntde, 

 harfh to the touch, loft : 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 y which docs not totally 



^ij^^g(^g^ i^J^if during liquefaction, and therefore ef- 

 fervejcing with acids. 



Withering Of a common figure and equal texture. 

 gii. Barolite. Witherite* Kir-voan mineral l. f. 1 34. 



Carbonate of Bsryt. Sch?/ieiJ/er mineral. 1. p, 253. 



Carbonat of Barytes. Thomjon^s chemiUry, 3.^ 620. 



Found at Anglezark near Chorley in Lancajhire^ near St. Afapk 

 in Wdlest and in Argylefhire in Scotland^ in folid mafles and 

 cryltallized : texture (hining, radicated, fibrous.* colour 

 greeniih- white or white: its cr)fta]s are fmall 6iided prifms 

 terminated by 6-fided pyramids: when heated it becomes 

 opake. Its powder phofj-horefces when thrown on burning 

 coals: contains barytes 62. carbonic acid 22, water 16. 



lamellosa. Lamellar, of a cryftalline figure, femipellucid, fmooth on 

 the outer furface, Ihining within. 



1. With 4 fidcd obliquangled fafcicled prifms, 



2. With 6-fided prifms, terminated at both ends by a 6-lided py- 



ramid. 



3, With 4 fided obliquangled tables, the terminal margins obtufe 



with an acicular point. 



4, With 6-fided double pyramids. 



Carbonate of Barytes. Soijoerby Brit, minerals^ tab 76, 

 Found in Scotland^ Lancajhire., 7orkJhire, and Saxony^ in folid 

 mafles: colour white, with a degree of tranfparency, 



B. Saturated with fulphuric acid, and therefore not effer- 



vefcing with acids: Jhining in the dark, after having 

 been whitened in the fire* " 



terrestris* Friable, in an earthy loofe or united form. 



BarofciCnite in an earthy loofe form. Kirivan, l, p. I'^S* 

 Ponderous earth Cawk, or friable heavy Spar. Schm, i, p. 255. 

 Eartiiy iuiphat of Barytes. ^bomjont chem. 3. /, 62^ 



