Provenite

Stewart Mine

MineClosedDraft data

46.0189° N, 112.5356° W · ± 1 km

Enargite from Montana, United States, with photos of specimens from this locality.

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Minerals found here

Enargite

On the same specimen

Same specimen Pyrite with Enargite

1 specimen photo(s) from this locality show enargite with pyrite together. The pairing comes from the photographer's file name and label, so the relationship between the two minerals is not specified.

Enargite at Stewart Mine

Three-dimensional cluster of enargite crystals to 2.5 cm dotted with small pyrite crystals from the Stewart Mine.
Three-dimensional cluster of enargite crystals to 2.5 cm dotted with small pyrite crystals from the Stewart Mine.
Photo: Robert M. Lavinsky · CC BY-SA 3.0 · Source
Formula
Cu₃AsS₄
Morphology
Freestanding sharp prismatic crystals in three-dimensional clusters
Typical size
Crystals to about 2.5 cm
Color / luster
Black, metallic
Associated minerals
Pyritequartzchalcopyritebornitechalcocitetennantitesphalerite
Availability
Scarce

Sources: SRC-646 SRC-662

About Enargite →

Geology of the locality

Setting
Main-stage hydrothermal copper-silver veins cut by the Rarus Fault
Type
Hydrothermal
Host rock
Late Cretaceous quartz monzonite (Boulder Batholith)
Region
Montana
Country
United States

Listed in MRDS as 'Steward Mine'; discovered 1879, first production 1880. Coordinates from the USGS MRDS record shown by Western Mining History; MRDS states its locations are not verified, hence +/- 1 km.

Sources: SRC-646

Sources

  1. SRC-646 · Database
    Steward MineUSGS Mineral Resources Data System (via Western Mining History) · Western Mining History
  2. SRC-662 · Website
    File:Enargite-Pyrite-49294.jpg (Wikimedia Commons)Robert M. Lavinsky · Wikimedia Commons

Draft data from the Provenite workbook. Check entries against the cited sources before relying on them. Photos are open-licence images from Wikimedia Commons; the author and licence are given with each photo.