Covellite

Object/Artifact

-

Crater Rock Museum

Name/Title

Covellite

Entry/Object ID

2014.1.12

Description

Chemical Composition: Al(OH)3 Crystal System: Hexagonal System Description: Common Name:Covellite Chemistry: CuS Group: Sulfides Location: Unknown Description: This is a rough specimen with irregular shape. There is a large patch of "pyrite" surrounded by a black crystalline sheets. Physical Charateristics: •Color is a deep metallic indigo blue (tarnished to purple or black) with iridescent yellow and red flashes. •Luster is metallic •Transparency crystals are opaque to translucent in very thin cleavage sheets. •Crystal System is hexagonal; 6/m2/m2/m •Crystal Habits: thin platy hexagonal crystals dominated by pinacoidal faces, usually on edge. Also massive and in small grains in sulfide ore bodies. •Cleavage is perfect in one direction forming thin sheets. •Fracture is flaky. •Hardness is 1.5 - 2. •Specific Gravity is 4.6 to 4.8 •Streak gray to black. •Associated Minerals include pyrite, chalcocite, chalcopyrite, cuprite, bornite and other copper sulfides. •Other Characteristics: thin cleavage sheets are flexible. •Notable Occurances Butte, Montana; Bor, Serbia; Germany; Austria and Sardinia. •Best Field Indicators are crystal habit, cleavage, density, iridescence and color. Hardness: 7 Quartz Rock Type: Sedimentary

Collection

RAGM Mineral Collection

Acquisition

Accession

2014.1

Source or Donor

Crater Rock Museum (unknown donors)

Acquisition Method

Gift

Dimensions

Height

2-3/4 in

Width

1-1/8 in

Length

1-1/4 in

Location

Location

Shelf

CS-I-1

Room

Curation Storage

Building

Crater Rock Museum

Date

February 3, 2024

Location

Shelf

5th shelf

Cabinet

Case# 20

Wall

West

Building

Freida Smith Hall

Category

Permanent