Enargite Composition, Crystallization and Structure

Composition. Sulpharsenate of copper, Cu3AsS4 or 3Cu2S. As2S5 = sulfur 32.6, arsenic, and the species graduate toward famatinite (3Cu2S.Sb2S5).

Crystallization. Orthorhombic. Prismatic crystals with prism zone vertically striated.

Structure. Colunnar, bladed, massive.

Physical Properties. Perfec prismatic cleavage. H. = 3. G. = 4.43-4.45. Metallic luster. Color and streak grayish black to iron-black.

Tests. Easily fusible (1). B. B. on charcoal gives volatile white sublimate of arseniuos oxide and characteristic garlic odor. In O. T. gives white crystalline sublimate of arseniuos oxide and odor sulfur dioxide. Roasted on charcoal, then moistened with hydrochloric acid and again ignited, gives azure- blue flame. Characterized by its color, its cleavage and the above tests.

Occurrence. A comparatively rare mineral, found associated with other copper minerals, as chalcocite, bornite, tennantite, etc. From Bor, near zajecar, Yugoslavia. Found bundantaly at Morococha, Peru; also from Chile and Argentina; island of Luzon, Philippines. Found is considerable quaintly with the copper ores at Butte, Montana. Occurs in the silver mines of the San Juan Mountains, Colorado.

Use. An ore of copper. Arsenic oxide also obtained from it at Butte, Montana.

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