08 PHYSIOGRAPHY. CLASS IT. 



LEONH. S. 518. Diallage metalloide (in part). HAUY. 

 Tabl. comp. p. 47. Diallage fibro-laminaire metalloide. 

 Traite", 2de Ed. T. II. p. 455. 



Fundamental form. Scalene four-sided pyramid 

 of unknown dimensions. Vol. I. Fig. 41. Simple 

 forms and combinations unknown. Character 

 of combinations hemi-prismatic (inferred from 

 cleavage), perhaps tetarto-prismatic. 



Cleavage P -f- oo highly perfect, though generally 

 a little curved, less distinct P -f GO = 94 (near- 

 ly). Traces of _f 72 (nearly) and Pr -f oo. 



X 

 Fracture uneven, splintery. 



Lustre, metallic-pearly upon ?r -f &> "> f r the rest 

 low degrees of an imperfect vitreous lustre. 

 Colour dirty shades of leek-green and blackish- 

 green, also liver-brown, hair-brown and clove- 

 brown, greenish- and ash-grey. They are 

 heightened by a metalloidal appearance upon 

 j> r _|_ op, and often incline to pinchbeck-brown. 

 Streak corresponding to the colour, yellowish- 

 or greyish- white. Translucent, sometimes only 

 on the edges. 



Rather sectile. Hardness = 4-0.. .50. Sp. Gr, 

 = $-251, a brown variety from Bayreuth. 



Compound Varieties. Massive : composition 

 granular, of various sizes of individuals, strongly 

 connected. 



OBSERVATIONS. 



1. The bem'-pr!smatic Schiller-spar consist?, according to 



KkAPBOTH, Of 



