PHYSIOGRAPHY. 'CLASS ll. 



Cleavage. R, perfect. Fracture conchoidal, un- 

 even. Surface streaked parallel to the edges of 

 combination, inclined upon R, either to the 

 right or to the left. 



Lustre vitreous inclining to resinous. Colour, 

 emerald-green, also blackish -green, and verdi- 

 gris-green. Streak green. Transparent... trans- 

 lucent. 



Brittle. Hardness = 5-0. Sp. Gr. = 3-278. 



OBSERVATIONS. 



1. Two analyses, one by LOWITZ, another by VAUQUE- 

 LIN, have yielded, 



Oxide of Copper 55-00 25-57. 



Carbonate of Lime 0-00 42-85. 



Silica 33-00 28-57. 



Water 12-00 0-00. 



It decrepitates before the blowpipe, and upon charcoal it 

 becomes black in the exterior flame, and red in the interior 

 one, without melting. It is easily soluble in glass of borax, 

 and imparts to it a green colour. It is soluble without ef- 

 fervescence in muriatic acid. 



2. It has been found accompanied by hemi-prismatic 

 Ilabroneme-malachite and rhombohedral Lime-haloide, but 

 the nature of its original repositories is not known. It oc- 

 curs in the Kirghese steppes, from whence it was brought 

 by ACHIR MEHEMET, a Buchanan merchant, and named in 

 consequence Achirite. According to Mr PHILLIPS, it oc- 

 curs in minute crystals with the prismatic Zinc-baryte 

 from Rezbanya in Hungary. 



