TAB. LIIL 



CUPRUM oxygenizatum, var. octaedrum. 



Crystallized Red Oxide of Copper, 

 Crystal Octaedral. 



Class 3. Metals. Ord.l. Homogeneous. 

 Gen. 4. Copper. Spec. 3. Oxide of Copper. 



Spec. Char. Copper combined with oxygen. 

 Syn. Red calciform copper ore. Kiriv. 2. 135". 



Native oxide of copper. Bab. 1 74. 



Roth-kupfererz. Emmerl. 2. 213. 



Cuivre oxyde rouge primitif. Ha'uy 3.557. 



Some of the crystallized red oxides of copper deserve from 

 their lustre the appellation of Ruby Coppers more than 

 others, which will be shown hereafter. The present fine 

 specimen has more of the steel-like lustre, as most of the 

 octaedrons have : however, the beautiful red sparkles in- 

 ternally with much brilliancy. It is not difficult to scrape 

 it with a knife, and the least scratch produces a rich red 

 powder of the colour of the gum called Dragon's Blood *. 



* Known in the Pharmacopoeia by the name of Sanguis Draconis, and ex- 

 tracted from Calamus Rotang of Linnseus, 



