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' ( I 3 I ) T WE N T I E T H SPECIES. Thumerftone. ^ Thumerftein.—Werner. ^°rl trnnfparent lenticulaire, R. de L. t. 2. P-353 ,— ' Cl afs fchorl, or Glaflein, IVid. p. 294—Thumerftone, ^triu. vol. 1. p. 273—r-Glaftfin, Klapr. b. 2. p. 118. "-Tumite, -Nap. p. 158—Janblite, Lam. t. 2. p. 316. ^■ a pierie de Thum. Broch. t. 1. p. 236—Axinite, Hau-y, t. 3, p. 2 2. External Characters. hs mod common colour is clove brown, of various e S r ees of intenfity; from that it pafles on the one '^ e ln to plumb blue, on the other into pearl grey, 8 re y, and greyifh black. ^ is feldom found mafiive, oftener difleminated, moft frequently cryftallized. *. In very flat and very oblique rhombs, in which the two oppofite obtufe lateral edges are generally truncated. 2 - Often the rhomb is fo flat that it has a tabu lar afpeft, and fometimes cryftals of this S 2 figure 1