Chalcopyrite/Quartz

Object/Artifact

-

Crater Rock Museum

Name/Title

Chalcopyrite/Quartz

Entry/Object ID

2014.1.39

Description

Chemical Composition: Al(OH)3 Crystal System: Hexagonal System Description: Common Name: Chalcopyrite Chemistry: CuFeS2 Group: Sulfides Location: Cavnic, Romania Description: Small flat specimen with very small Sphalerite crystals composing the matrix and a grouping of golden crystals. Physical Charateristics: •Color is brassy yellow, tarnishes to irredescent blues, greens, yellows and purples. •Luster is metallic. •Transparency: Crystals are opaque. •Crystal System is tetragonal; bar 4 2m •Crystal Habits are predominantly the disphenoid which is like two opposing wedges and resembles a tetrahedron. Crystals sometines twinned. Also commonly massive, and sometimes botryoidal. •Cleavage is rather poor in one direction. •Fracture is conchoidal and brittle. •Hardness is 3.5-4 •Specific Gravity is approximately 4.2 (average for metallic minerals) •Streak is dark green. •Other Characteristics: Some striations on most crystal faces. •Associated Minerals are quartz, fluorite, barite, dolomite, calcite, pentlandite, pyrite and other sulfides. •Notable Occurances include Chile, Peru, Mexico, Europe, South Africa, several USA sites and many others around the world. •Best Field Indicators are crystal habit, tarnish, softness and brittleness. 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

3-11/16 in

Width

11/16 in

Length

2-7/8 in

Location

Location

Display Case

FS-11

Room

Frieda Smith Hall

Building

Crater Rock Museum

Category

Permanent