mineral specimens
rare minerals
mineral dealer
systematic minerals
Black Hills minerals
fine minerals
mineral dealer
Dana minerals
IMA minerals
mineral collections
rock and minerals
gem crystal
0 item @ $0.00  

Mineralpedia Details for Enargite

Reset

Enargite

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

Formula
Cu3AsS4 
Crystal System
Orthorhombic 
Crystal Habit
Euhedral Crystals, Massive - Granular, Prismatic 
Cleavage
Perfect, Distinct, Distinct 
Luster
Metallic 
Color
steel gray, blackish gray, violet black 
Streak
black 
Class
Orthorhombic - Pyramidal 
Fracture
Uneven 
Hardness
WebMineral
View Enargite 
Mindat
View Enargite 

Enargite from Butte dist., Silver Bow Co., Montana, United States

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. 

Click thumbnail images for larger view.

Enargite from Julcani mine, Julcani dist., Huancavelica dept., Peru

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.

Click thumbnail images for larger view.

All photos by Dakota Matrix and are Copyrighted © and may not be used without permission. Copyright © 2020 - Dakota Matrix Minerals, Inc. Privacy | Terms & Conditions | Site Map