Beyerite Mineral Data

Beyerite Mineral Data +

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General Beyerite Information

Chemical Formula:

(Ca,Pb)Bi2(CO3)2O2

Composition:

Molecular Weight = 651.84 gm

Calcium 4.61 % Ca 6.45 % CaO

Bismuth 64.12 % Bi 71.48 % Bi₂O₃

Lead 7.95 % Pb 8.56 % PbO

Carbon 3.69 % C 13.50 % CO₂

Oxygen 19.64 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Ca_0.75Pb_0.25Bi₂(CO₃)₂O₂

Environment:

Secondary mineral associated with bismuthite.

IMA Status:

Valid Species (Pre-IMA) 1943

Locality:

Schneeberg, Sachsen (Saxony), Germany Link to MinDat.org Location Data.

Name Origin:

Named for A. Beyer.

Synonym:

ICSD 36246

PDF 22-1067

Beyerite Image

Images:

Beyerite

Comments: Greenish yellow crusts of beyerite on pegmatite.
Location: Harding Mine, Taos County, New Mexico, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Beyerite Crystallography

Axial Ratios:

a:b:c =0.9996:1:5.7564

Cell Dimensions:

a = 3.7729, b = 3.7742, c = 21.726, Z = 2; V = 309.37 Den(Calc)= 7.00

Crystal System:

Orthorhombic - DipyramidalH-M Symbol (2/m 2/m 2/m) Space Group: I mmm

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

By Intensity(I/I_o): 2.84(1), 1.75(0.8), 2.14(0.8),

Crystal Structure:

Mouse
drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
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Grice J D , The Canadian Mineralogist , 40 (2002) p.693-698, A solution to the crystal structures of bismutite and beyerite

Physical Properties of Beyerite

Cleavage:

None

Color:

Gray, Gray green, Yellow, Yellowish white, White.

Density:

6.56

Diaphaniety:

Transparent to Translucent

Fracture:

Conchoidal - Fractures developed in brittle materials characterized by smoothly curving surfaces, (e.g. quartz).

Hardness:

2-3 - Gypsum-Calcite

Luster:

Vitreous - Dull

Streak:

white

Optical Properties of Beyerite

Gladstone-Dale:

CI meas= -0.008 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.055 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1538,KPDmeas= 0.1641,KC= 0.1628

Optical Data:

Biaxial (?), a=1.97, b=2.13, g=2.13, bire=0.1600

Calculated Properties of Beyerite

Electron Density:

r_electron=5.59 gm/cc
note: r_Beyerite=6.56 gm/cc.

Fermion Index

Fermion Index = 0.01812
Boson Index = 0.98188

Photoelectric:

PE_Beyerite=1,355.93 barns/electron
U=PE_Beyerite x r_electron=7,573.49 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Beyerite is Not Radioactive

Beyerite Classification

Dana Class:

16a.2.3.1 (16a)Carbonates - Hydroxyl or Halogen

(16a.2)where (A B)3 (XO3)2 Zq

(16a.2.3)Dana Group

16a.2.3.1 Beyerite (Ca,Pb)Bi2(CO3)2O2 I mmm 2/m 2/m 2/m

Strunz Class:

V/C.09-40 V - Nitrates, Carbonates and Borates

V/C - Waterfree carbonates with unfamiliar anions

V/C.09 - Phosgenite - Beyerite series

V/C.09-10 Phosgenite Pb2(CO3)Cl2 P 4/mbm 4/m 2/m 2/m

V/C.09-20 Bismutite Bi2(CO3)O2 Imm2 mm2

V/C.09-30 Kettnerite CaBi(CO3)OF Pmmn 2/m 2/m 2/m

V/C.09-40 Beyerite (Ca,Pb)Bi2(CO3)2O2 I mmm 2/m 2/m 2/m

Other Beyerite Information

References:

PHYS. PROP.(AmMin, Vol 88, p 478) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

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

Beyerite

(Ca,Pb)Bi2(CO3)2O2
Dana No: 16a.2.3.1 Strunz No: V/C.09-40
Locality:

Notes: