Copper

Object/Artifact

-

Crater Rock Museum

Name/Title

Copper

Entry/Object ID

2014.1.147

Description

Chemical Composition: CU Crystal System: Cubic or Isometric S Description: Common Name:Copper Chemistry: Cu Group: Element Location: Unknown Description: A small slab cut from a Copper ore.Both of the cut flat surfaces are strewn with bright copper colored flecks and patches. Physical Charateristics: Color is copper colored with weathered specimens tarnished green. • Luster is metallic. • Transparency is opaque. • Crystal System is isometric; 4/m bar 3 2/m • Crystal Habits include massive, wires and arborescent or branching forms as the most common, whole individual crystals are extremely rare but when present are usually cubes and octahedrons. Occasionally, massive forms will show some recognizable crystal faces on outer surfaces. • Cleavage is absent. • Fracture is jagged. • Streak is reddish copper color. • Hardness is 2.5-3 • Specific Gravity is 8.9+ (above average for metallic) • Associated Minerals are silver, calcite, malachite and other secondary copper minerals. Other Characteristics: ductile, malleable and sectile, meaning it can be pounded into other shapes, stretched into a wire and cut into slices. • Notable Occurrences include Michigan and Arizona, USA; Germany; Russia and Australia. • Best Field Indicators are color, ductility and crystal habit. Fracture: Jagged Hardness: 3 Calcite Luster: Metallic Rock Type: Sedimentary Specific Gravity: 8.9+ Streak: Reddish Copper

Collection

Delmar Smith Mineral Collection

Acquisition

Accession

2014.1

Source or Donor

Crater Rock Museum (unknown donors)

Acquisition Method

Gift

Dimensions

Width

1-3/4 in

Depth

1/4 in

Length

3-1/8 in

Location

Location

Shelf

CS-I-3

Room

Curation Storage

Building

Crater Rock Museum

Date

January 31, 2024

Location

Cabinet

K-1 rear

Wall

North

Building

Storage (old gift shop upstairs)

Category

Permanent