Bechererite Mineral Data

Bechererite Mineral Data +

General Bechererite Information

Chemical Formula:

(Zn,Cu)6Zn2(OH)13[(S,Si)(O,OH)4]2

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

Empirical Formula:

Zn_4.5Cu_1.5Zn₂(OH)₁₃2(S_0.75)2(Si_0.25)2(O₃)2(OH)

Environment:

Alteration product of copper and zinc orebodies.

IMA Status:

Approved IMA 1994 (Dana # Added)

Locality:

The dump of the Tonopah-Belmont mine, Osborne silver-gold district, Maricopa County, Arizona USA. Link to MinDat.org Location Data.

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.

Synonym:

ICSD 81354

IMA1994-005

PDF 46-1438

Search for Bechererite Images

Images:

Image not yet available on Webmineral.com

Try searching images.google.com or Mindat Picture Gallary for mineral pictures. Caution: The images retrieved may not be appropriate.

Bechererite Crystallography

Axial Ratios:

a:c = 1:0.88632

Cell Dimensions:

a = 8.322, c = 7.376, Z = 1; V = 442.39 Den(Calc)= 3.50

Crystal System:

Trigonal - PyramidalH-M Symbol (3) Space Group: P 3

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 7.37(1), 2.556(0.5), 3.282(0.3),

Forms:

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

Warning: this large pop-up is very compute intensive and may not work well with some computers.

Crystal Structure:

Mouse
drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
Keyboard
S - Stereo Pair on/off
H - Help Screen
I - Data Info
A - Atoms On/Off
P - Polyhedra On/Off
B - Bonds On/Off
Help on Above

Giester G , Rieck B , American Mineralogist , 81 (1996) p.244-248, Bechererite, (Zn,Cu)6Zn2(OH)13[(S,Si)(O,OH)4]2, a novel mineral species from the, Tonopah-Belmont mine, Arizonia, Note: U(1,2) changed for Si, S, O1, OH1 to match symmetry constraints.

View Additional jPOWD Structure files for Bechererite
[1]

Physical Properties of Bechererite

Cleavage:

[001] Perfect

Color:

Light green.

Density:

3.45 - 3.49, Average = 3.47

Diaphaniety:

Transparent

Fracture:

Brittle - Generally displayed by glasses and most non-metallic minerals.

Habit:

Acicular - Occurs as needle-like crystals.

Habit:

Druse - Crystal growth in a cavity which results in numerous crystal tipped surfaces.

Habit:

Spherical - Spherical, rounded aggregates.

Hardness:

2.5-3 - Finger Nail-Calcite

Luminescence:

Non-fluorescent.

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Bechererite

Dichroism (e):

colorless.

Dichroism (w):

colorless.

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

Optical Data:

Uniaxial (-), e=1.611, w=1.705, bire=0.0940.

Calculated Properties of Bechererite

Electron Density:

r_electron=3.36 gm/cc
note: r_Bechererite=3.47 gm/cc.

Fermion Index

Fermion Index = 0.01992
Boson Index = 0.98008

Photoelectric:

PE_Bechererite= 27.31 barns/electron
U=PE_Bechererite x r_electron= 91.87 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Bechererite is Not Radioactive

Bechererite Classification

Dana Class:

31.1.6.2 (31)Hydrated Sulfates Containing Hydroxyl or Halogen

(31.1)where (A+ B++)m (XO4)p Zq·x(H2O), where m:p>6:1

(31.1.6)Dana Group

31.1.6.1 Schulenbergite (Cu,Zn)7(SO4,CO3)2(OH)10·3(H2O) P 3 or P 3- Trig

31.1.6.2 Bechererite ! (Zn,Cu)6Zn2(OH)13[(S,Si)(O,OH)4]2 P 3 3

Strunz Class:

VI/D.08-05 VI - Sulfates,Chromates,Molybdates and Tungstates

VI/D - Water-bearing sulfates with unfamiliar anions. cations of medium size

VI/D.08 - Spangolite - Glaucocerinite series

VI/D.08-05 Bechererite (Zn,Cu)6Zn2(OH)13[(S,Si)(O,OH)4]2 P 3 3

VI/D.08-10 Spangolite Cu6Al(SO4)(OH)12Cl·3(H2O) P 3₁c 3m

VI/D.08-20 Cyanotrichite Cu4Al2(SO4)(OH)12·2(H2O) Unk Ortho

VI/D.08-30 Carbonate-cyanotrichite Cu4Al2(CO3,SO4)(OH)12·2(H2O) Unk Ortho

VI/D.08-35 Camerolaite Cu4Al2[HSbO4,SO4](OH)10(CO3)·2(H2O) P 2₁ ? 2

VI/D.08-40 Woodwardite Cu4Al2(SO4)(OH)12·2-4(H2O) Unk Hex

VI/D.08-42 Hydrowoodwardite! Cu1-xAlx(OH)2(SO4)x/2·n(H2O)with0<x<0.67andn>3x/2 R 3m 3 2/m

VI/D.08-45 Zincowoodwardite! [Zn1-xAlx(OH)2][(SO4)x/2(H2O)n] P 3- or R 3m 3

VI/D.08-45* Zincowoodwardite-1T! [Zn1BxAlx(OH)2][(SO4)x/2·n(H2O)],x=0.33,n.0.96 P 3 3

VI/D.08-45** Zincowoodwardite-3R! [Zn1BxAlx(OH)2][(SO4)x/2·n(H2O)],0.32<x<0.50,n=0.59 R 3m 3 2/m

VI/D.08-50 Chalcoalumite CuAl4(SO4)(OH)12·3(H2O) P 2₁ 2

VI/D.08-60 Nickelalumite (Ni,Cu)Al4[(SO4),(NO3)2](OH)12·3(H2O) P 2₁ 2

VI/D.08-70 Mbobomkulite (Ni,Cu)Al4(NO3,SO4)2(OH)12·3(H2O) P 2₁ 2

VI/D.08-80 Hydrombobomkulite (Ni,Cu)Al4(NO3,SO4)2(OH)12·14(H2O) Unk Mono

VI/D.08-90 Carrboydite (Ni,Cu)14Al9(SO4,CO3)6(OH)43·7(H2O) Unk Hex

VI/D.08-100 Zincaluminite Zn6Al6(SO4)2(OH)26·5(H2O) Unk Hex

VI/D.08-110 Glaucocerinite (Zn,Cu)5Al3(SO4)1.5(OH)16·9(H2O) Unk (HEX-R) Trig

Other Bechererite Information

References:

NAME( MinRec) PHYS. PROP.(Am.Min.,Vol.81,1996) OPTIC PROP.(MinRec)

See Also:

Links to other databases for Bechererite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - Crocoite.com Mineral Locations 4 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 - WWW-MINCRYST

Search for Bechererite using:

[ALTAVISTA] [AOL] [About.com] [All-The-Web] [HotBot] [Ixquick] [LookSmart] [MAMMA] [MSN.COM] [Netscape] [Teoma] [Wikipedia] [YAHOO]

Visit our Advertisers for Bechererite :
AA Mineral Specimens
A-Rocks Auction
Adams Minerals
B and L Minerals
Dakota Matrix
Dan Weinrich Fine Minerals
Dan Weinrich Auctions
e-Rocks Auctions
Excalibur Minerals
Exceptional Minerals
Fabre Minerals
Greenside Minerals
John Betts Fine Minerals
Masons Minerals
Mineral News
Mineral of the Month Club
MineralsWeb Fine Minerals
Minernet.it
Rockshop.cz Kalat Fine Minerals
T G Fine Minerals
Wrights Rock Shop

Translate Bechererite Mineral Data :

Ask about Bechererite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Español

Print or Cut-and-Paste your Bechererite Specimen Label here :

Bechererite

(Zn,Cu)6Zn2(OH)13[(S,Si)(O,OH)4]2
Dana No: 31.1.6.2 Strunz No: VI/D.08-05
Locality:

Notes: