Brochantite

From CAMEO
Jump to: navigation, search
Brochantite

Contents

Description

A vivid green mineral composed of tribasic copper sulfate. Brochantite was discovered by French grologist, A.J.M Brochant de Villiers. It is a secondary mineral found in oxidized zones of copper deposits in Arizona, Chile, Mexico, and Russia. The mineral also forms as a bright green corrosion product on copper and bronze artifacts exposed to sulfur containing pollution. Brochantite is considered a stable patina, but may indicate pit formation for outdoor leaded bronzes due to the formation of a soluble lead sulfate.

See also antlerite.

Synonyms and Related Terms

tribasic copper sulfate; Brochantit (Deut.); brochantite (Fr., It.); brocantita (Esp.); brochantiet (Ned.); brochantite (Port.)

Raman

Brochantiteitaly1.jpg

FTIR

Brochantite5m.jpg

FTIR

Brochantite(385).PNG

XRD

PIG385.jpg

SEM

F385sem.jpg

EDS

F385edsbw.jpg


Other Properties

Needle-like prisms in orthorhombic crystalline system.

Streak = pale green. Luster = vitreous. Perfect cleavage in one direction. Fracture = conchoidal

Composition Cu4SO4(OH)6
Mohs Hardness 3.5 - 4.0
Density 3.9-4.0

Additional Information

Mineralogy Database: Brochantite

Sources Checked for Data in Record

  • Dictionary of Building Preservation, Ward Bucher, ed., John Wiley & Sons, Inc., New York City, 1996
  • C.W.Chesterman, K.E.Lowe, Audubon Society Field Guide to North American Rocks and Minerals, Alfred A. Knopf, New York, 1979
  • Thomas Gregory, The Condensed Chemical Dictionary, Reinhold Publishing, New York, 3rd ed., 1942
  • Random House, Webster's Encyclopedic Unabridged Dictionary of the English Language, Grammercy Book, New York, 1997

Personal tools
Namespaces

Variants
Actions