Mineralogy Database

Brochantite Mineral Data

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General Brochantite Information

Help on Chemical  Formula: Chemical Formula: Cu4(SO4)(OH)6
Help on Composition: Composition: Molecular Weight = 452.29 gm
   Copper    56.20 %  Cu   70.35 % CuO
   Hydrogen   1.34 %  H    11.95 % H2O
   Sulfur     7.09 %  S    17.70 % SO3
   Oxygen    35.37 %  O
            ______        ______ 
            100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Cu4(SO4)(OH)6
Help on Environment: Environment: Secondary, formed in arid climates or in rapidly oxidizing copper sulfide deposits.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1824
Help on Locality: Locality: Chuquicamata, Chile. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named after the French geologist and mineralogist, A. J. M. Brochant de Villiers (1772-1840).
Help on Name Pronunciation: Name Pronunciation: Brochantite + Pronunciation Say BROCHANTITE
Help on Synonym: Synonym: Blanchardite
  ICSD 64688
  PDF 43-1488

Brochantite Image

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Comments: Blue green spray of acicular brochantite crystals on matrix.
Location: Douglas Hill, Lidwig, Lyon County, Nevada, USA. Scale: Size Not Given.
© Lou Perloff / Photo Atlas of Minerals

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  Linarite   Brochantite

Comments: Deep blue, acicular, linarite with light blue, globular brochantite on white quartz.
Location: Goulmina, Er Rachidia, Morroco. Scale: Crystal size 1.5 cm.
© Fabre Minerals

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Comments: Prismatic crystals of blue green brochantite.
Location: Grand View Mine, Grand Canyon, Coconino County, Arizona, USA. Scale: See Image.
© Jeff Weissman / Photographic Guide to Mineral Species

Brochantite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =1.3279:1:0.6111
Help on Cell Dimensions: Cell Dimensions: a = 13.08, b = 9.85, c = 6.02, Z = 4; beta = 103.366° V = 754.60 Den(Calc)= 3.98
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: P 21/a
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.521(1), 3.9(0.85), 2.678(0.5),
Help on Forms: Forms:

Dbl Clk - Start-Stop Rotation
RMB - Cycle Display Modes
Drag1 - Manipulate Crystal
Drag2 - Resize

S - Stereo
I - Indicies
<space> - Start-Stop Rotation
F - Fit to Screen
M - Menu

Help on Above

Forms: ( 0 0 1) ( 1 1 1) ( 2 0 1) ( 2 1 0) ( 1 0 0) ( 1 1 0)

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Physical Properties of Brochantite

Help on Cleavage: Cleavage: {100} Perfect
Help on Color: Color: Green, Emerald green, Black.
Help on Density: Density: 3.97
Help on Diaphaneity: Diaphaneity: Transparent to translucent
Help on Fracture: Fracture: Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.
Help on Habit: Habit: Acicular - Occurs as needle-like crystals.
Help on Habit: Habit: Druse - Crystal growth in a cavity which results in numerous crystal tipped surfaces.
Help on Habit: Habit: Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).
Help on Hardness: Hardness: 3.5-4 - Copper Penny-Fluorite
Help on Luminescence: Luminescence: Non-fluorescent.
Help on Luster: Luster: Vitreous - Pearly
Help on Streak: Streak: pale green

Optical Properties of Brochantite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.008 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= -0.005 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1925,KPDmeas= 0.193,KC= 0.1916
Ncalc = 1.76
Help on Optical Data: Optical Data: Biaxial (-), a=1.728, b=1.771, g=1.8, bire=0.0720, 2V(Calc)=76, 2V(Meas)=72. Dispersion relatively weak.

Calculated Properties of Brochantite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.84 gm/cc
note: Specific Gravity of Brochantite =3.98 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0007035267
Boson Index = 0.9992964733
Help on Photoelectric: Photoelectric: PEBrochantite = 25.03 barns/electron
U=PEBrochantite x rElectron Density= 96.02 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Brochantite is Not Radioactive

Brochantite Classification

Help on  Dana Class: Dana Class: (30)Anhydrous Sulfates Containing Hydroxyl or Halogen
  (30.01)where (A B)m (XO4)p Zq where m:p>2:1
  (30.01.03)Dana Group Brochantite Cu4(SO4)(OH)6 P 21/a 2/m
Help on  Strunz Class: Strunz Class: 07.BB.25 07 - SULFATES (SELENATES, TELLURATES)
  07.B - Sulfates (selenates, etc.) with Additional Anions, without H2O
  07.BB -With medium-sized cations
07.BB.25 Brochantite Cu4(SO4)(OH)6 P 21/a 2/m

Other Brochantite Information

Help on References: References: NAME( Duda&Rejl90) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Mason68)
Help on See Also: See Also: Links to other databases for Brochantite :
1 - Alkali-Nuts(English)
2 - Alkali-Nuts(Francais)
3 - Am. Min. Crystal Structure Database
4 - Amethyst Galleries' Mineral Gallery
5 - Athena
6 - EUROmin Project
7 - Ecole des Mines de Paris
8 - Franklin Minerals(Dunn)
9 - GeoScienceWorld
10 - Glendale Community College
11 - Google Images
12 - Google Scholar
13 - Handbook of Mineralogy (MinSocAm)
14 - Handbook of Mineralogy (UofA)
15 - MinDAT
16 - Mineral and Gemstone Kingdom
17 - Mineralienatlas (Deutsch)
18 - Online Mineral Museum
19 - QUT Mineral Atlas
20 - Ruff.Info

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Dana No: Strunz No: 07.BB.25





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