Brochantite


Also found in: Dictionary, Wikipedia.
Related to Brochantite: cuprite

brochantite

[brō′shän‚tīt]
(mineralogy)
Cu4(SO4)(OH)6 A monoclinic copper mineral, emerald to dark green, commonly found with copper sulfide deposits; a minor copper ore. Also known as brochanite; brochanthite; warringtonite.

Brochantite

 

(named after the French 19th-century mineralogist A. J. M. Brochant de Villiers), a mineral of the class of sulfates. It has an insular-type structure made up of PO4 tetrahedrons connected by Cu arranged in the center of the octahedron Cu[(OH)5O]. Its chemical composition is Cu4[SO4](OH)6. Brochantite crystallizes in a monoclinic system. It is found in the form of crystalline crusts with druses of small, needle-like dark-green crystals or in the form of powdery masses. The mineral’s hardness on the mineralogic scale measures 3.5-4.0; its density is 3,800-4,100 kg/m3. Brochantite is formed in the zones of oxidation of deposits of copper sulfide ores under the conditions of a hot, dry climate. Along with other minerals of the zones of oxidation of copper deposits, such as atacamite, chrysocolla, and azurite, it may serve as a copper ore.

References in periodicals archive ?
Reaction pathway and kinetics of the thermal decomposition of synthetic brochantite, Journal of thermal analysis, 49: 1467-1475.
Equilibrium diagrams show that atacamite is stable in saline waters at Spence (Leybourne and Cameron 2008), and an antipathetic relationship between S[O.sub.4] and Cl in these waters suggest that brochantite is currently being replaced by atacamite (Cameron et al.
Oxide mineralogy consists principally of brochantite and chrysocolla occurring as disseminations, veinlets and as open-space fillings in breccias.
Researchers blamed antlerite's presence on acidic rain, dew, fog and particulates, which made the statute's surface too acidic for brochantite to remain stable, says Robert Baboian, a corrosion scientist at Texas Instruments, Inc., in Attleboro, Mass., who studied the statute's patina.
Colorless, transparent, complex crystals (to 2.5 mm) of anglesite occur with brochantite, caledonite, chlorargyrite and linarite in cavities at the Reward mine.
It consists mainly of brochantite and a basic copper chloride called atacamite, CuCl.sub.2..3Cu(OH).sub.2.
Other minerals found there include the sulfide minerals chalcopyrite, galena, glaucodot, marcasite, pyrite and sphalerite, as well as anglesite, barite, brochantite, "nail-head" calcite, devilline, dolomite, linarite, malachite, quartz, schulenbergite, serpierite, smolyaninovite and wroewolfeite.
Brochantite [Cu.sub.4.sup.2+] ([SO.sub.4])[(OH).sub.6]
Is Hauy's "cuivre sulfate" then chalcanthite, brochantite or antlerite?
It is surprising to see Fairfield phosphates at this early date, as well as cyanotrichite and brochantite from the Last Chance mine (today known as the Grandview mine) in the Grand Canyon, Arizona.
The effervescence of malachite in hydrochloric acid distinguishes it easily from the associated copper minerals brochantite and conichalcite.
Associated with this material were atacamite, brochantite, claringbullite, gerhardtite and considerable amounts of connellite.