from The Century Dictionary.
- noun A sulpharsenite of copper occurring in small black orthorhombic crystals, also massive, in Peru, Chili, Colorado, etc.
from the GNU version of the Collaborative International Dictionary of English.
- noun (Min.) An iron-black mineral of metallic luster, occurring in small orthorhombic crystals, also massive. It contains sulphur, arsenic, copper, and often silver.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun mineralogy A
steel gray, blackish gray, to violet black copper arsenic sulfosalt mineralwith a metallic luster.
Sorry, no etymologies found.
Several other, less-common minerals contain arsenic, including orpiment, realgar, and enargite, which are arsenic sulfides.
There is a rough zonal arrangement of the ore minerals around the intrusive, gold and copper minerals (chiefly enargite and chalcopyrite) being more prominent near the intrusive, and argentiferous galena and zinc blende richer at greater distances.
The enargite of the Butte copper ores (pp. 201-203) contains a considerable amount of arsenic, a large part of which will be recovered from the smelter fumes by new processes which are being installed.
It was formerly supposed that most of the chalcocite was of this origin; but as chalcocite is found in important amounts with enargite and chalcopyrite to great depths (now 3,500 feet), where the veins are still rich and strong, it begins to appear that much of the chalcocite is of primary origin.
The natural inference was that as the veins were followed deeper the proportion of chalcocite would rapidly diminish, and that a leaner primary zone of chalcopyrite, enargite and other primary minerals would be met.
(pp. 235) also yield important amounts, the arsenic-bearing minerals being enargite and tennantite (copper-arsenic sulphides) and others.
Toyang Prospect), whilst to the west residual silica and enargite-bearing quartz veins typical of high-sulfidation epithermal systems are encountered (