170 PHYSIOGEAPHY. CLASS II. 



OBSERVATIONS. 



1. From a comparison of the general description given 

 of the present species and of hemi-prismatic Habroneme- 

 malachite, or even from that of their characters, as given in 

 the Characteristic, it appears that they cannot be united 

 within one and the same species, as has been done by se- 

 veral celebrated mineralogists, who founded their opinion 

 chiefly on the agreement of the chemical analyses. In 

 other respects, the present and the former determinations 

 differ only in regard to. the establishment of Earthy Blue 

 Copper into a particular sub-species, and the division of the 

 rest of the varieties, or the Radiated Blue Copper^ according 

 to their mechanical composition. 



2. Two analyses of the present species, one by KLAP- 

 ROTH, the other by VAUQUELIN-, have yielded 



Copper 56-00 56-00. 



Oxygen 14-00 12-50. 



Carbonic Acid 24-00 25-00. 



Water 6-00 6-50. 



Its chemical formula is Cu Aq 2 + 2 Cu C 2 , corresponding 

 to 69-16 oxide of copper, 25-61 carbonic acid, and 5-23 of 

 water. It is soluble with effervescence in nitric acid, be- 

 comes black if exposed alone to high degrees of tempera- 

 ture, melts upon charcoal, and colours glass of borax 

 green in the oxidating flame. 



3. It is met with in veins and beds, included in rocks of 

 different ages. It is generally accompanied by other ores 

 of copper, and among these principally by hemi-prismatic 

 Habroneme-malachite, with which it is often intimately 

 connected, so that crystals of the form of the 'present spe- 

 cies, consist entirely, or at least with only the exception 

 of a thin film on the surface, of the delicate green fibres of 

 the hemi-prismatic Habroneme-malachite. It is often en- 

 gaged in ochrey varieties of prismatic Iron-ore, and asso- 

 ciated with di-prismatic Lead-baryte, sometimes with hexa- 

 hedral Lead glance, and prismatic Cobalt-mica ; besides also 

 with prismatic Hal-baryte, rhombohedral Quartz, rhombo- 



