166 PHYSIOGRAPHY. CLASS II. 



2. DI-PRISMATIC OLIVE-MALACHITE. 



Prismatic Olivenite, or Phosphate of Copper (in part). JAM. 

 Syst. Vol. II. p. 331. Di-prismatip Olivenite. Man. p. 

 98. Phosphate of Copper. PHILL. p. 314. Olivenerz 

 (in part). WERN. Hoffm. H. B. III. 2. S. 170. Blatt- 

 riger Pseudomalachit (in partX HAUSM. III. S. 1036. 

 Phosphorsaures Kupfer (in part). LEONH. S. 273. Cuivre 

 phosphate' (in part). HAUY. Tabl. comp. p. 92. Traite', 

 2de Ed. T. III. p. 519. 



Fundamental form. Scalene four-sided pyramid. 

 P = 122 58', 117 8', 89 59'. Vol. I. Fig. 9. 

 LEONH. 



a : b : c = 1 : V 2-194 : ^ 1'839- 



Simple forms. P (P) ; (ft) 5 . P + oo (u) = 95 

 2' ; (Pr -f o>) 5 = 130 48' ; r (o) = 111 58'. 



Char, of Comb. Prismatic. 



Combinations. 1. ?r. P -f CD. Sim. Fig. 2. 

 2. ft-. P. P -f OD. Fig. 5. 



Cleavage, indistinct traces parallel to ft and P -f oo. 

 Fracture conchoidal, uneven. Surface of P very- 

 smooth and even ; ft striated parallel to its edges 

 of combination with P, P -f QD in a vertical di- 

 rection, often uneven. 



Lustre resinous. Colour olive-green, generally 

 dark. Streak olive-green. Translucent on the 

 edges. 



Brittle. Hardness = 4-0. Sp. Gr. = 3-6 ... 8-8. 



OBSERVATIONS. 



1. According to BDCHOLZ, the present species consists 

 of phosphate of copper ; but no accurate analysis of it has 

 yet been published. Mineralogists are not entirely agreed 

 respecting its classification. Some unite it with the pre- 

 ceding species, others with the prismatic Habroneme- 



