Mineralpedia Details for Enargite
Named for the Greek word enargis, meaning “vivid,” for its distinct cleavage. Enargite is a common and widespread mineral that occurs locally as an important copper ore. A few localities for well crystallized material include in Peru, Argentina, the Philippines, Taiwan, Japan, the United States, Austria, Italy, and Namibia. Enargite occurs in hydrothermal vein deposits and as a late-stage mineral in low-temperature deposits.
Ref. Handbook of Mineralogy, Anthony et al (1995) and MSA at http://www.handbookofmineralogy.org/pdfs/enargite.pdf
- Crystal System
- Crystal Habit
- Euhedral Crystals, Massive - Granular, Prismatic
- Perfect, Distinct, Distinct
- steel gray, blackish gray, violet black
- Orthorhombic - Pyramidal
- View Enargite
- View Enargite
Enargite from Butte dist., Silver Bow Co., Montana, United States
- Special Info
- Phillips Collection
Silvery black striated 9mm Enargite crystals, which are distinct and well-formed. They are classic Enargite amongst good 5-13mm Pyrite crystals.
Also an ore specimen with long embedded Enargite crystals to 5cm. Enargite was widespread in the Butte mines. Enargite, a copper arsenic sulfide, is an important ore of copper, when found in large quantites since the arsenic content is a liability. Enargite accounted for 25-40% of Butte's copper production.
Last four photos are of a large heavy but almost pure crystalline mass of steely grey Enargite.
Enargite from Julcani mine, Julcani dist., Huancavelica dept., Peru
The specimen has been roughed up in places but represents a nice textbook Enargite with the largest crystal to 2cm.