Brendelite
A valid IMA mineral species
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About Brendelite
Formula:
(Bi3+,Pb)2(Fe3+,Fe2+)(PO4)O2(OH)
Colour:
dark brown, black
Lustre:
Adamantine, Vitreous
Hardness:
4½
Specific Gravity:
6.83 (Calculated)
Crystal System:
Monoclinic
Name:
Named for Christian Friedrich Brendel (26 December 1776 in Neustädtel - 20 November 1861 in Freiberg), mining Director at Schneeberg-Neustädtel, in recognition of his development and application of mechanized mining technology.
Structurally related to namibite. One of three Bi-Fe phosphate minerals beside paulkellerite and zaïrite.
Phosphate and hydroxyl groups are disordered. An ordered structure model was built basing on a doubled parameter b. The structure details/elements:
- FeO6 octahedra
- PO4 tetrahedra
- Fe2(Oo)4(Oh)2(PO4)2 chains || [010], formed by corner-sharing of the above polyhedra (first type of chains)
- hydrogen bonds, that link the chains in (100)
- edge-connected (Bi,Pb)[1+4]O5 polyhedra, that form (Bi,Pb)2(Oo)2(Op)2 chains || [010] (second type of chains).
Chains of the first and second type have common corners and edges.
Phosphate and hydroxyl groups are disordered. An ordered structure model was built basing on a doubled parameter b. The structure details/elements:
- FeO6 octahedra
- PO4 tetrahedra
- Fe2(Oo)4(Oh)2(PO4)2 chains || [010], formed by corner-sharing of the above polyhedra (first type of chains)
- hydrogen bonds, that link the chains in (100)
- edge-connected (Bi,Pb)[1+4]O5 polyhedra, that form (Bi,Pb)2(Oo)2(Op)2 chains || [010] (second type of chains).
Chains of the first and second type have common corners and edges.
Unique Identifiers
Mindat ID:
6831
Long-form identifier:
mindat:1:1:6831:0
GUID
(UUID V4):
(UUID V4):
ea774b1e-e929-4f0f-b9c6-50d12e81acac
IMA Classification of Brendelite
Classification of Brendelite
8.BM.15
8 : PHOSPHATES, ARSENATES, VANADATES
B : Phosphates, etc., with additional anions, without H2O
M : With medium-sized and large cations, (OH, etc.):RO4 = 4:1
8 : PHOSPHATES, ARSENATES, VANADATES
B : Phosphates, etc., with additional anions, without H2O
M : With medium-sized and large cations, (OH, etc.):RO4 = 4:1
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 |
---|---|---|
Bde | 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 Brendelite
Adamantine, Vitreous
Colour:
dark brown, black
Streak:
light brown
Hardness:
4½ on Mohs scale
Cleavage:
None Observed
Density:
6.83 g/cm3 (Calculated)
Comment:
couldn't be measured
Optical Data of Brendelite
Type:
Biaxial (-)
RI values:
nα = 2.060 nβ = 2.150 nγ = 2.190
Max Birefringence:
δ = 0.130
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:
Very High
Dispersion:
r < v strong
Pleochroism:
Strong
Comments:
dark brown to opaque (Y=Z), light brown to brown (X)
Chemistry of Brendelite
Mindat Formula:
(Bi3+,Pb)2(Fe3+,Fe2+)(PO4)O2(OH)
Common Impurities:
Pb,Fe(II)
Crystallography of Brendelite
Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
B2/m
Setting:
C2/m
Cell Parameters:
a = 12.278(2) Å, b = 3.815(1) Å, c = 6.899(1) Å
β = 111.14(1)°
β = 111.14(1)°
Ratio:
a:b:c = 3.218 : 1 : 1.808
Unit Cell V:
301.4 ų
Z:
2
Crystal Structure
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Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
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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) |
---|---|---|---|---|---|---|---|
0014642 | Brendelite | Krause W, Bernhardt H J, McCammon C, Effenberger H (1998) Brendelite, (Bi,Pb)2Fe3+,2+O2(OH)(PO4), a new mineral from Schneeberg, Germany: description and crystal structure Mineralogy and Petrology 63 263-277 | 1998 | Schneeberg, Germany | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
d-spacing | Intensity |
---|---|
5.726 Å | (54) |
3.372 Å | (77) |
3.322 Å | (37) |
3.217 Å | (46) |
3.011 Å | (100) |
2.863 Å | (34) |
2.750 Å | (62) |
Geological Environment
Paragenetic Mode(s):
Paragenetic Mode | Earliest Age (Ga) |
---|---|
Stage 7: Great Oxidation Event | <2.4 |
47a : [Near-surface hydration of prior minerals] | |
47c : [Carbonates, phosphates, borates, nitrates] | |
47d : [Arsenates, antimonates, selenates, bismuthinates] | |
47h : [Near-surface oxidized, dehydrated minerals] | |
Stage 10b: Anthropogenic minerals | <10 Ka |
55 : Anthropogenic mine minerals |
Type Occurrence of Brendelite
General Appearance of Type Material:
tabular to blocky crystals to 0.3 mm, hemispheres with a radiating structure to 3 mm across.
Place of Conservation of Type Material:
Staatliches Museum für Mineralogie und Geologie, Dresden, Germany.
Geological Setting of Type Material:
secondary, very rare, in dump material of a Bi-Co-Ni-Ag deposit
Associated Minerals at Type Locality:
Synonyms of Brendelite
Other Language Names for Brendelite
Related Minerals - Strunz-mindat Grouping
8.BM. | Betpakdalite-NaNa | [Na2(H2O)16Na(H2O)6][Mo8As2Fe3+3O33(OH)4] |
8.BM. | Gunmaite | (Na2Sr)Sr2Al10(PO4)4F14(OH)12 |
8.BM.05 | Retzian-(Ce) | Mn2+2Ce(AsO4)(OH)4 |
8.BM.05 | Retzian-(La) | (Mn2+,Mg)2(La,Ce,Nd)(AsO4)(OH)4 |
8.BM.05 | Retzian-(Nd) | Mn2+2(Nd,Ce,La)(AsO4)(OH)4 |
8.BM.10 | Paulkellerite | (BiO)2Fe3+(PO4)(OH)2 |
8.BM.10 | Kolitschite | PbZn0.5Fe3(AsO4)2(OH)6 |
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 Brendelite
mindat.org URL:
https://www.mindat.org/min-6831.html
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References for Brendelite
Reference List:
Krause, W., Bernhardt, H. -J., McCammon, C., Effenberger, H. (1998) Brendelite, (Bi,Pb)2Fe3+,2+O2(OH)(PO4), a new mineral from Schneeberg, Germany: Description and crystal structure. Mineralogy and Petrology, 63 (3) 263-277 doi:10.1007/bf01164154
Localities for Brendelite
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.
Finland | |
| Ilkka Järvelä collection |
Germany | |
| Belendorff (2021) |
| Schnorrer (1995) +1 other reference |
| Krause et al. (1998) +1 other reference |
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Güldener Falk Mine, Neustädtel, Schneeberg, Erzgebirgskreis, Saxony, Germany