EARTHS. CALCAREOUS. 29. Boracites. iit 



29. EORACITES. Confifting of carbonate of lime, 

 a larger proportion of carbonate ot magnefia, ti^e 

 greater part boracic acid, and a little alumina, 

 filica and oxyde of iron: hard, lamellar, lightifh, 

 cubic : becoming elictric by heat, not effervef- 

 cingwith acids, crackling in the fiie, and before 

 the blow pipe contracting and melting into a 

 yellowilh glafs, 



fuiicus, BORACITES. 



IVestrumb Chem, Annal 1788. t./. 4^3. Sedativfpat, 



Boracite. Kirvjan miner aL i, p. 172. 



Boracit. Schmet^er miner, i. p. 234. 



Borat of magnefia. ^homfon chem. 3.^.626. 



Found at Kalkberg near Lunehurg, feated in a bed of gypfum % 

 colour hyaline or greyifh-white, fometimes paiTing into vio- 

 let or fea-green : cubes very fmall, with truncated edges and 

 angles, fo that the faces of the truncated angles exhibit alter- 

 nately hexagons and triangles: fraflure compacl, flat, con- 

 ehoidal: contains boracic acid 68. carbonate of magnelia 13,. 

 carbonate of lime n=. filica i. argil, u iron 6. 



