Brandholzite Mineral Data

Brandholzite Mineral Data

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General Brandholzite Information

Chemical Formula:

Mg[Sb(OH)6]2·6(H2O)

Composition:

Molecular Weight = 1,027.57 gm

Magnesium 2.37 % Mg 3.92 % MgO

Antimony 47.39 % Sb 62.96 % Sb₂O₅

Hydrogen 3.53 % H 31.56 % H₂O

Oxygen 46.71 % O

______ ______

100.00 % 98.44 % = TOTAL OXIDE

Empirical Formula:

Mg2(Sb₂)2(OH)₁₂·6(H₂O)

Environment:

An alteration of stibnite in the oxidation zone with "antimony-ochers" and stibnite. Mg-dominant analogue of bottinoite

IMA Status:

Approved IMA 1998 (Dana # Added)

Locality:

Schmidten-Schacht and Jakobi-Schacht (pits) of the master lode in the former Brandholz-Groldkronach mining district in the western part of the Fichtelgebirge, Bavaria, Germany. Link to MinDat.org Location Data.

Name Origin:

Named after the locality.

Synonym:

ICSD 89819

IMA1998-017

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Brandholzite Crystallography

Axial Ratios:

a:c = 1:0.61207

Cell Dimensions:

a = 16.114, c = 9.863, Z = 6; V = 2,217.92 Den(Calc)= 4.62

Crystal System:

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

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

By Intensity(I/I_o): 4.636(1), 3.392(0.7), 4.946(0.5),2.356(0.4), 2.103(0.2), 2.595(0.2), 4.217(0.2),

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Crystal Structure:

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Friedrich A , Wildner M , Tillmanns E , Merz P L , American Mineralogist , 85 (2000) p.593-599, Crystal chemistry of the new mineral brandholzite, Mg(H2O)6[Sb(OH)6]2,, and of the synthetic analogues M(H2O)6[Sb(OH)6]2 (Me=Mg,Co)

Physical Properties of Brandholzite

Color:

Colorless.

Diaphaniety:

Transparent

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Brandholzite

Gladstone-Dale:

CI calc= 0.417 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1233,KC= 0.2115

Optical Data:

Uniaxial (-), e=1.569, w=1.57, bire=0.0010.

Calculated Properties of Brandholzite

Electron Density:

r_electron=4.42 gm/cc
note: r_Brandholzite=4.62 gm/cc.

Fermion Index

Fermion Index = 0.00259
Boson Index = 0.99741

Photoelectric:

PE_Brandholzite= 145.76 barns/electron
U=PE_Brandholzite x r_electron= 644.87 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Brandholzite is Not Radioactive

Brandholzite Classification

Dana Class:

6.3.9.2 (6)Hydroxides and Oxides Containing Hydroxyl

(6.3)with (OH)3 or (OH)6 groups

(6.3.9)Dana Group

6.3.9.1 Bottinoite NiSb2(OH)12·6(H2O) P 3 3

6.3.9.2 Brandholzite ! Mg[Sb(OH)6]2·6(H2O) P 3 3

Strunz Class:

IV/F.04-15 IV - Oxides

IV/F - Hydroxides and oxidic hydrates, water-bearing oxides with layered structure

IV/F.04 - Jamborite - Bottinoite series

IV/F.04-10 Jamborite (Ni,Ni,Fe)(OH)2(OH,S,(H2O)) Unk Hex

IV/F.04-15 Brandholzite Mg[Sb(OH)6]2·6(H2O) P 3 3

IV/F.04-20 Bottinoite NiSb2(OH)12·6(H2O) P 3 3

Other Brandholzite Information

References:

NAME( MinRec, v 32, p 210) PHYS. PROP.(MinRec, v 32, p 210) OPTIC PROP.(MinRec, v 32, p 210)

See Also:

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

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Brandholzite

Mg[Sb(OH)6]2·6(H2O)
Dana No: 6.3.9.2 Strunz No: IV/F.04-15
Locality:

Notes: