APPENDIX I. 



MINERALS, THE GEEATER PART OF WHICH WILL PROBABLY 

 FORM IN FUTURE DISTINCT SPECIES IN THE MINERAL 

 SYSTEM. 



ACMITE. 

 SPAR. 



Achmite. STROM. Edinb. PhiL Journ. Vol. IX. p. 55. 



Hemi-prismatic. Combination observed similar to 

 Fig. 186.* Inclination of M on M over r = 86 

 56', angle abc = 28 19', MITSCHERLICH ; s on s 

 = 119 3CX, edge between s and s on r = 106, 

 AP. Twin-crystals compound parallel to r. 



Cleavage, distinct parallel to M, also to r and / 

 and s. Fracture imperfect conchoidal. Surface, 

 r irregularly streaked in a longitudinal direction, 

 the rest of the faces pretty even, but not very 

 smooth. 



Lustre vitreous. Colour brownish-black. Streak 

 pale yellowish-grey. Opake, very thin edges are 

 translucent, and shew a fine yellowish-brown tint. 



Brittle. Hardness = 6-0 ... 6-5. Sp. Gr. = 3-24, 

 STROM. 



In the cabinet of Mr ALLAN. 



