barsowite

[Named from Barsovskoi, in the auriferous sands of which it occurs.] A mineral, a variety of Anorthite, of a granular texture. Hardne , 5.5-6; sp. gr., 2-74-2-75; lustre, pearly; colour, snow-white. Compos.: Silica, 4871; alumina, 33-90; magnesia, 1.54; lime, 15.2999.44. ( Dana.) * barst, * berst, pret. of v. [BURST.] "And slou to grounde vaste ynou and barste mony a elde." Rob. Glouc ., p. 437. "Atte laste thoru stronge duntes hy uerd berstatuo ." Ibid ., p. 460. Still used in North of England. (S. in Boucher .)