PLATE XVI. 
Figs. 1—3. —Red Copper. 
1. Cuprite or red oxide of copper , crystallised in regular octahedrons, the primary form, attached to dense crystalline 
foliated ore, from Siberia; contains 88 - 5 of copper. 
2. The same , an isolated crystal, an octahedron with truncation of all the edges, from Chessy at Lyons. 
3. The same , the edges at the junction of the octahedral faces being truncated, from the same place. 
Figs. 4—7.—Blue Copper. 
4. Azurite or Chessylite , composed of two equivalents of carbonate of copper and one equivalent of hydrous oxide of 
copper, in oblique rhombic prisms, with partial traces of malachite. 
5. The same , a secondary monoclinic or clinorhombic table, with truncation of the obtuse lateral edges and of the obtuse 
angles, from the same place. 
6. The same , with truncation of the basal edges and of the acute angles, same locality. 
7. Hie same , radiated, dark blue, from a vein of the variegated sandstone of Neubulach, in the Black Forest of Wiir- 
tembnrg. 
Figs. 8—12.—Malachite. 
8. Malachite , green carbonate of copper , with one-half equivalent of water, an oblique-rhombic prism, arranged in a 
bundle, from the Herrensegen in the Schwarzwald or Black Forest. 
9. The same , twins, composed of two half-oblique rhombic prisms, with truncation of the obtuse lateral edges, from 
Chessy. 
10. Fibrous Malachite , in compact masses, sawed and polished, from Siberia. 
11. The same , velvet-like lustrous radiating bundles of acicular crystals, on liver-coloured ore, from the Herrensegen in 
the Schapbachthal. 
12. Compact Malachite , with tuberose surface, as it is used for all kinds of small objects of vertu when polished like 
No. 10, also from Siberia. 
Figs. 13—15.—Phosphates of Copper. 
13. Phosphochalcite , Lunnite or hydrous-phosphate of copper , arranged in a radiated manner in oblique-rhombic prisms, the 
primary form, on hornstone, from Rheinbreitenbach. 
14. Libethenite or octahedral phosphate of copper, in rectangular octahedrons, on quartz, from Libethen in Hungary. 
15. The same , with truncation of two vertical edges, united with the rhombic prism, same locality. 
Figs. 16 and 17.—Silicate of Copper. 
16. Dioptase or emerald copper , of drusiform arrangement in rhombohedrons, with truncation of the basal edges, on 
quartz, from Altyn-Tubeli in the Kirgisensteppe, Siberia. 
17. The same , isolated crystal, from the same place. 
Figs. 18—22.—Arseniates of Copper. 
18. Euchroite, or subarseniate of copper , with four equivalents of water, in rhombic octahedrons, with a drusiform arrange¬ 
ment, on brown quartz, from Libethen in Hungary. 
19. Liroconite , or octahedral arseniate of copper , with two and a-half equivalents of water, in rhombic prisms, with a 
drusiform arrangement, on quartz from Cornwall. 
20. The same , isolated crystal, a right rhombic crystal, with truncation of the obtuse angles, from the same locality. 
21. Olivenite or prismatic arseniate of copper , with two equivalents of water, a lower right rhombic prism, with trunca¬ 
tion of the acute angle, from the same locality. 
22. Chalcophyllite or copper mica , with three equivalents of water, a rhombohedron, with truncation of the vertex to a 
rhombohedral table, from Redruth in Cornwall. 
Fig. 23.—Sulphate of Copper. 
23. Cyanosite or sulphate of copper , with five equivalents of water, an oblique rhomboidal prism, the primary form, with 
truncation of the obtuse lateral edges, from the same place. 
