Earths, calcareous. 29. BoracUes. 
in 
29. BORACITES. Confiding of carbonate of lime, 
a larger proportion of carbonate of magnefia, the 
greater part boracic acid, and a little alumina, 
filica and oxyde of iron: hard, lamellar, lightifh, 
cubic : becoming elifti ic bv heat, not effervef- 
cingwith acid^, crackling in the fire, and before 
the blow-pipe contraffing and melting into a 
yeliowifii glafs. 
**tUus, Bora CITES. 
Westrumb Chem. Jnnal. 1788. 1.^483. Sedativfpat. 
Boracite. Kirovan mineraU i . p. 172. 
Boracit. Schmeiffer miner . i. p, 234. 
Borat of magnefia. Thomjon chem. 3. p. 626* 
Found at Kalkberg near Lmebtirg, feated in a bed of gypfu'm 
colour hyaline or greyifli-white, fometimes paffing 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 : fraClure compaOt, flat, con- 
choidal: contains boracic acid 68. carbonate of magnefia 13, 
carbonate of lime it. fiiica 1. argil, i. iron 6, 
