( 533 ) t THIRT'EENTH SPECIES. Arragone. Arragone.—Werner. dragon fpar, Kirw. vol. i. p.87.^— Arragonite, EJlncr, b. 2. f. 1039.-T.W. Emm- b. 5. p. 357—L’Ajrragonite, Brock,. t. I. p. 576. 14. Ha,uy. t. 4. p. 337. External Characters. Colours are greenifh grey, and pearl grey; the 8 r eenilh grey pafies into mountain green, and the P e arl grey into pale violet blue •, both colours are Un Ued in a particular manner. In certain rare varieties it is fpotted red and brown, ^h'ch is owing to intermixed parts. ^ is always cryftallifed. 1. In perfeft equiangular fix-fided prifms. 2. Six-fided prifms, in which two oppofite lateral planes are broader, and four fmaller. Some times the edges formed by the meeting of the fmaller lateral planes are bevilled, and the edges of the bevillment are alfo fome- times deeply truncated.—Estner. Ihe cryftals fornetinres adhere to one another, and alfo a peculiar kind of twin cryftal; a re middle 3 Z fized,