24 • The fevcral SPECIES 



and thofe that confift of parallel threads or fibres ; 

 the former appearing as fo many accumulated 

 leaves •, tho' not feparable into tables or plates, 

 like fpad or Mufcovy-glafs ; the latter, as lb many 

 fibres in a mufcle, or piece of wood, tho' not ac- 

 tually to be parted into fuch, as having received 

 that appearance only from the piece of wood 

 that happened to lie near them. Nay, the fphe- 

 rical themfelves confift of pure radii or cones, 

 whofe ends jutt out beyond the external fphe- 

 rical furface, and there exhibit all manner of emi- 

 nences, as may be feen by the fmootheft fort, with- 

 out a magnifying glafs •, fuch are the Heflian, and 

 thofe of Toplitz and Altfattel. But the half-round 

 and the kidney formed, as thofe at Friberg called 

 cobaldy confift not of radii running from a center 

 to a circumference, but of fhells or coats, that 

 lie upon each other •, or whofe radii run parallel, 

 and to different points, confequently forming no 

 genuine fphere. Of the angular, the four fided is 

 the rarer fort ; ftill rarer is the pyramidal four- 

 fided ; where a narrow fide ferving as a bafe, the 

 other three equal fides run to a point. A fix- 

 fided pyrites, on the contrary, is more, nay, 

 moft common of all •, with angles often fo ac- 

 curately fquared, as if done by rule. Such I have 

 had in particular from the Bannat of Temefwaer 

 and from Pretfchendorff; tho' not all fo exactly 

 iquare, but that there were fome rhomboidal, 

 fome quite irregular, with here and there fides 

 depreffed, angles often broken off. 



In general, we are to obferve of the cubical 

 (the feveral forts of which hitherto mentioned often 

 lie together, as at Pretfchendorff) that they chufe 

 beds, where there are none of eight or more fides. 

 The fix-fided cellular or honey- combed fort is re- 

 markable in this, that the cells are fo adaptedly 

 filled with pieces of Glitter, as to fhew like a fet 



of 



