Mineralogy Database

Bechererite Mineral Data

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General Bechererite Information

Help on Chemical  Formula: Chemical Formula: (Zn,Cu)6Zn2(OH)13[(S,Si)(O,OH)4]2
Help on Composition: Composition: Molecular Weight = 933.60 gm
   Zinc      45.53 %  Zn   56.67 % ZnO
   Copper    10.21 %  Cu   12.78 % CuO
   Silicon    1.50 %  Si    3.22 % SiO2
   Hydrogen   1.62 %  H    14.47 % H2O
   Sulfur     5.15 %  S    10.29 % SO2
   Oxygen    35.99 %  O
            ______        ______ 
            100.00 %       97.43 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Zn4.5Cu1.5Zn2(OH)132(S0.75)2(Si0.25)2(O3)2(OH)
Help on Environment: Environment: Alteration product of copper and zinc orebodies.
Help on IMA Status: IMA Status: Approved IMA 1994 (Dana # Added)
Help on Locality: Locality: The dump of the Tonopah-Belmont mine, Osborne silver-gold district, Maricopa County, Arizona USA. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named after Dr. Karl Becherer (1926-) of the University of Vienna, in recognition of his contributions to the mineralogy of Spangolite from Lavrion.
Help on Name Pronunciation: Name Pronunciation: Bechererite + Pronunciation Say BECHERERITE
Help on Synonym: Synonym: ICSD 81354
  PDF 46-1438

Bechererite Crystallography

Help on Axial Ratios: Axial Ratios: a:c = 1:0.88632
Help on Cell Dimensions: Cell Dimensions: a = 8.322, c = 7.376, Z = 1; V = 442.39 Den(Calc)= 3.50
Help on Crystal System: Crystal System: Trigonal - Pyramidal H-M Symbol (3) Space Group: P 3
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 7.37(1), 2.556(0.5), 3.282(0.3),
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: ( 2 4 1) ( 1 2 0) ( 0 0 1)

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Physical Properties of Bechererite

Help on Cleavage: Cleavage: {001} Perfect
Help on Color: Color: Light green.
Help on Density: Density: 3.45 - 3.49, Average = 3.47
Help on Diaphaneity: Diaphaneity: Transparent
Help on Fracture: Fracture: Brittle - Generally displayed by glasses and most non-metallic minerals.
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: Spherical - Spherical, rounded aggregates.
Help on Hardness: Hardness: 2.5-3 - Finger Nail-Calcite
Help on Luminescence: Luminescence: Non-fluorescent.
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white

Optical Properties of Bechererite

Help on Dichroism (e): Dichroism (e): colorless.
Help on Dichroism (w): Dichroism (w): colorless.
Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.023 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.032 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.188,KPDmeas= 0.1896,KC= 0.1941
Ncalc = 1.67 - 1.68
Help on Optical Data: Optical Data: Uniaxial (-), e=1.611, w=1.705, bire=0.0940.

Calculated Properties of Bechererite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.36 gm/cc
note: Specific Gravity of Bechererite =3.47 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.01
Boson Index = 0.99
Help on Photoelectric: Photoelectric: PEBechererite = 27.31 barns/electron
U=PEBechererite x rElectron Density= 91.87 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Bechererite is Not Radioactive

Bechererite Classification

Help on  Dana Class: Dana Class: (31)Hydrated Sulfates Containing Hydroxyl or Halogen
  (31.01)where (A+ B++)m (XO4)p Zq�x(H2O), where m:p>6:1
  (31.01.06)Schulenbergite group Schulenbergite (Cu,Zn)7(SO4,CO3)2(OH)10•3(H2O) Hex Hex Bechererite! (Zn,Cu)6Zn2(OH)13[(S,Si)(O,OH)4]2 P 3 3 Osakaite! Zn4SO4(OH)6•5H2O P1 1 Zn-Schulenbergite! (Zn,Cu)7(SO4,CO3)2(OH)10•3(H2O) Hex Hex
Help on  Strunz Class: Strunz Class: 07.DD.55 07 - SULFATES (SELENATES, TELLURATES)
  07.D - Sulfates (selenates, etc.) with additional anions, with H2O
  07.DD -With only medium-sized cations; sheets of edge-sharing octahedra
07.DD.55 Bechererite! (Zn,Cu)6Zn2(OH)13[(S,Si)(O,OH)4]2 P 3 3

Other Bechererite Information

Help on References: References: NAME( MinRec) PHYS. PROP.(Am.Min.,Vol.81,1996) OPTIC PROP.(MinRec)
Help on See Also: See Also: Links to other databases for Bechererite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - Handbook of Mineralogy (MinSocAm)
7 - Handbook of Mineralogy (UofA)
8 - MinDAT
9 - Mineralienatlas (Deutsch)
10 - Online Mineral Museum
11 - QUT Mineral Atlas
12 - Ruff.Info

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Dana No: Strunz No: 07.DD.55





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