Brandholzite
A valid IMA mineral species
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About Brandholzite
Formula:
MgSb2(OH)12 · 6H2O
Colour:
Colourless
Lustre:
Vitreous
Hardness:
2 - 3
Specific Gravity:
2.65
Crystal System:
Trigonal
Member of:
Name:
Named after the type locality - the former mining district of Brandholz-Goldkronach, Fichtelgebirge, Germany.
This page provides mineralogical data about Brandholzite.
Unique Identifiers
Mindat ID:
7046
Long-form identifier:
mindat:1:1:7046:7
GUID
(UUID V4):
(UUID V4):
398197ce-84d2-4442-8c1e-f54614349aa4
IMA Classification of Brandholzite
Approved
Approval year:
1998
Classification of Brandholzite
4.FH.05
4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
F : Hydroxides (without V or U)
H : Hydroxides with H2O +- (OH); insular octahedra
4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
F : Hydroxides (without V or U)
H : Hydroxides with H2O +- (OH); insular octahedra
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
Symbol | Source | Reference |
---|---|---|
Bdh | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Brandholzite
Vitreous
Transparency:
Transparent
Colour:
Colourless
Streak:
White
Hardness:
2 - 3 on Mohs scale
Tenacity:
Brittle
Cleavage:
None Observed
Fracture:
Conchoidal
Density:
2.65(5) g/cm3 (Measured) 2.57 g/cm3 (Calculated)
Optical Data of Brandholzite
Type:
Uniaxial (-)
RI values:
nω = 1.570(2) nε = 1.569(2)
Max Birefringence:
δ = 0.001
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
and does not take into account mineral colouration.
Surface Relief:
Low
Chemistry of Brandholzite
Mindat Formula:
MgSb2(OH)12 · 6H2O
Elements listed:
Crystallography of Brandholzite
Crystal System:
Trigonal
Class (H-M):
3 - Pyramidal
Space Group:
P3
Cell Parameters:
a = 16.119 Å, c = 9.868 Å
Ratio:
a:c = 1 : 0.612
Unit Cell V:
2,220.42 ų (Calculated from Unit Cell)
Z:
6
Morphology:
Tabular hexagonal crystals with predominant forms {1010} and {0001}.
Twinning:
On {1010}.
Crystal Structure
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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure
ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
---|---|---|---|---|---|---|---|
0002426 | Brandholzite | Friedrich A, Wildner M, Tillmanns E, Merz P L (2000) 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) American Mineralogist 85 593-599 | 2000 | 0 | 293 | ||
0017004 | Brandholzite | Beintema J (1936) On the crystal-structure of magnesium- and nickelantimonate. _cod_database_code 1010069 Proceedings of the Koninklijke Nederlandse Academie van Wetenschappen 39 241-252 | 1936 | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
d-spacing | Intensity |
---|---|
4.636 Å | (100) |
3.392 Å | (70) |
4.946 Å | (50) |
2.356 Å | (40) |
Geological Environment
Paragenetic Mode(s):
Paragenetic Mode | Earliest Age (Ga) |
---|---|
Stage 7: Great Oxidation Event | <2.4 |
47a : [Near-surface hydration of prior minerals] | |
47d : [Arsenates, antimonates, selenates, bismuthinates] |
Type Occurrence of Brandholzite
General Appearance of Type Material:
Tabular, hexagonal crystals up to ~1 mm in diameter (but mostly <0.5 mm), often forming rose-like aggregates.
Place of Conservation of Type Material:
Institut für Mineralogie und Kristallographie, Universität Wien, Vienna, Austria.
Geological Setting of Type Material:
An alteration product of stibnite within a zone of oxidation.
Associated Minerals at Type Locality:
Synonyms of Brandholzite
Other Language Names for Brandholzite
Relationship of Brandholzite to other Species
Common Associates
Related Minerals - Strunz-mindat Grouping
4.FH.05 | Bottinoite | Ni2+Sb5+2(OH)12 · 6H2O |
Fluorescence of Brandholzite
Not fluorescent.
Other Information
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
Internet Links for Brandholzite
mindat.org URL:
https://www.mindat.org/min-7046.html
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Please feel free to link to this page.
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References for Brandholzite
Reference List:
Localities for Brandholzite
Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and further information on this occurrence.
? - Indicates mineral may be doubtful at this locality.
- Good crystals or important locality for species.
- World class for species or very significant.
(TL) - Type Locality for a valid mineral species.
(FRL) - First Recorded Locality for everything else (eg varieties).
Struck out - Mineral was erroneously reported from this locality.
Faded * - Never found at this locality but inferred to have existed at some point in the past (e.g. from pseudomorphs).
All localities listed without proper references should be considered as questionable.
All localities listed without proper references should be considered as questionable.
Austria | |
| Auer (2023) |
Germany (TL) | |
| - (n.d.) +2 other references |
Meier (1995) | |
Italy | |
| Orlandi (2011) +1 other reference |
Luxembourg | |
| 43-45 +4 other references |
Slovakia | |
| Sejkora S. et al. (2004) +3 other references |
| Števko M. et al. (in Slovak) +3 other references |
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Kolársky vrch deposit, Pezinok, Pezinok District, Bratislava Region, Slovakia