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Lukrahnite

A valid IMA mineral species
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07132830014949025474174.jpg
Lukrahnite, etc.

Clara Mine, Oberwolfach, Ortenaukreis, Freiburg Region, Baden-Württemberg, Germany
05185460014948860221769.jpg
Lukrahnite, etc.

Tsumeb, Oshikoto Region, Namibia
02581760017055941972440.jpg
Lukrahnite

Tsumeb Mine, Tsumeb, Oshikoto Region, Namibia
07132830014949025474174.jpg
Lukrahnite, etc.

Clara Mine, Oberwolfach, Ortenaukreis, Freiburg Region, Baden-Württemberg, Germany
05185460014948860221769.jpg
Lukrahnite, etc.

Tsumeb, Oshikoto Region, Namibia
04739950017055075545754.jpg
Lukrahnite

Tsumeb Mine, Tsumeb, Oshikoto Region, Namibia
07132830014949025474174.jpg
Lukrahnite, etc.

Clara Mine, Oberwolfach, Ortenaukreis, Freiburg Region, Baden-Württemberg, Germany
05185460014948860221769.jpg
Lukrahnite, etc.

Tsumeb, Oshikoto Region, Namibia
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About LukrahniteHide

09667690015396138484730.jpg
Dr. Ludger Krahn
Formula:
CaCuFe3+(AsO4)2(OH,H2O)2
Colour:
yellow
Lustre:
Dull, Earthy
Hardness:
5
Specific Gravity:
4.18 (Calculated)
Crystal System:
Triclinic
Name:
For Ludger Krahn (b. 1957), mineral collector of Krefeld, Germany, who provided the initial specimen for study.
Tsumcorite Group.

Ca analogue of Gartrellite. Fe3+ analogue of alumolukrahnite.


Unique IdentifiersHide

Mindat ID:
11010
Long-form identifier:
mindat:1:1:11010:9
GUID
(UUID V4):
dcd00d3f-a1c5-45be-aeac-91a808086f66

IMA Classification of LukrahniteHide

IMA status:
Approved
Approval year:
1999
First published:
2001

Classification of LukrahniteHide

Strunz-mindat (2024):
8.CG.20

8 : PHOSPHATES, ARSENATES, VANADATES
C : Phosphates without additional anions, with H2O
G : With large and medium-sized cations, RO4:H2O = 1:1

Mineral SymbolsHide

As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.

SymbolSourceReference
LkrIMA–CNMNCWarr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43

Physical Properties of LukrahniteHide

Lustre:
Dull, Earthy
Transparency:
Transparent
Colour:
yellow
Streak:
light yellow
Hardness:
5 on Mohs scale
Hardness:
VHN25=630 kg/mm2 - Vickers
Hardness Data:
Measured
Tenacity:
Brittle
Cleavage:
None Observed
Density:
4.18 g/cm3 (Calculated)

Optical Data of LukrahniteHide

Type:
Biaxial (+)
RI values:
nα = 1.830 nβ = 1.834 nγ = 1.890
2V:
Measured: 30°
Max Birefringence:
δ = 0.060
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Very High
Pleochroism:
Visible
Comments:
X=yellow
Y=Z=pale yellow
Orientation could not be determined

Chemistry of LukrahniteHide

Mindat Formula:
CaCuFe3+(AsO4)2(OH,H2O)2
Elements listed:
As, Ca, Cu, Fe, H, O - search for minerals with similar chemistry

Crystallography of LukrahniteHide

Crystal System:
Triclinic
Class (H-M):
1 - Pinacoidal
Space Group:
P1
Cell Parameters:
a = 5.457 Å, b = 5.539 Å, c = 7.399 Å
α = 68.43°, β = 68.9°, γ = 69.44°
Ratio:
a:b:c = 0.985 : 1 : 1.336
Unit Cell V:
187.8 ų
Z:
1
Twinning:
None mentioned

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
4.953 Å(22)
4.444 Å(20)
3.416 Å(100)
3.186 Å(40)
2.927 Å(64)
2.832 Å(26)
2.700 Å(30)
2.533 Å(30)
2.468 Å(25)
Comments:
Tsumeb, Namibia. Data from the type description.

Geological EnvironmentHide

Type Occurrence of LukrahniteHide

Type Locality:
ⓘ Tsumeb Mine (Ongopolo Mine), Tsumeb, Oshikoto Region, Namibia
General Appearance of Type Material:
Spherical aggregates up to 0.5 mm; individual grains < 30 microns.
Place of Conservation of Type Material:
Mineralogical Institute, University of Bochum, Germany.
Associated Minerals at Type Locality:
WulfeniteQuartzCopper-bearing AdamiteConichalciteChalcocite
Beudantite

Synonyms of LukrahniteHide

Other Language Names for LukrahniteHide

German:Lukrahnit
Simplified Chinese:羟砷铁铜钙石 (in part)
Spanish:Lukrahnita

Relationship of Lukrahnite to other SpeciesHide

Member of:
Tsumcorite Group
Other Members of this group:
AlumolukrahniteCa[CuAl](AsO4)2(H2O,OH)2Tric. 1 : P1
CabalzariteCaMg2(AsO4)2 · 2H2OMon. 2/m : B2/m
CobaltlotharmeyeriteCaCo2(AsO4)2 · 2H2OMon. 2/m : B2/m
CobalttsumcoritePbCo2(AsO4)2 · 2H2OMon. 2/m : B2/m
FerrilotharmeyeriteCaZnFe3+(AsO4)2(OH) · H2OMon. 2/m : B2/m
GartrellitePbCuFe3+(AsO4)2(OH) · H2OTric. 1 : P1
HelmutwinkleritePbZn2(AsO4)2 · 2H2OTric. 1 : P1
KaliochalciteKCu2(SO4)2[(OH)(H2O)]Mon. 2/m : B2/m
KrettnichitePbMn3+2(VO4)2(OH)2Mon. 2/m : B2/m
LotharmeyeriteCaZn2(AsO4)2 · 2H2OMon. 2/m : B2/m
ManganlotharmeyeriteCaMn3+2(AsO4)2(OH)2Mon. 2/m : B2/m
MawbyitePbFe3+2(AsO4)2(OH)2Mon. 2/m : B2/m
MounanaitePbFe3+2(VO4)2(OH,F)2Mon. 2/m : B2/m
NatrochalciteNaCu2(SO4)2(OH) · 2H2OMon. 2/m : B2/m
NickellotharmeyeriteCaNi2(AsO4)2 · 2H2OMon. 2/m : B2/m
NickelschneebergiteBiNi2(AsO4)2(OH) · H2OMon. 2/m : B2/m
NickeltsumcoritePb(Ni,Fe3+)2(AsO4)2(H2O,OH)2Mon. 2/m : B2/m
PhosphogartrellitePbCuFe3+(PO4)2(OH,H2O)2Tric. 1 : P1
RappolditePbCo2(AsO4)2 · 2H2OTric. 1 : P1
SchneebergiteBiCo2(AsO4)2(OH) · H2OMon. 2/m : B2/m
ThometzekitePbCu2+2(AsO4)2 · 2H2OMon. 2/m : B2/m
TsumcoritePbZn2(AsO4)2 · 2H2OMon. 2/m : B2/m
YancowinnaitePbCuAl(AsO4)2OH · H2O Tric. 1 : P1
ZincgartrellitePbZn2(AsO4)2(H2O,OH)2Tric. 1 : P1

Common AssociatesHide

Associated Minerals Based on Photo Data:
14 photos of Lukrahnite associated with OliveniteCu2(AsO4)(OH)
6 photos of Lukrahnite associated with BeudantitePbFe3(AsO4)(SO4)(OH)6
6 photos of Lukrahnite associated with QuartzSiO2
2 photos of Lukrahnite associated with ConichalciteCaCu(AsO4)(OH)
2 photos of Lukrahnite associated with CupriteCu2O
1 photo of Lukrahnite associated with WulfenitePb(MoO4)
1 photo of Lukrahnite associated with MimetitePb5(AsO4)3Cl

Related Minerals - Strunz-mindat GroupingHide

8.CG.Ca-HuréauliteCaMn5(PO4)4 · 4H2O
8.CG.FluckiteCaMn2+(AsO3OH)2 · 2H2OTric. 1 : P1
8.CG.DondoelliteCa2Fe(PO4)2 · 2H2OTric. 1 : P1
8.CG.AlumolukrahniteCa[CuAl](AsO4)2(H2O,OH)2Tric. 1 : P1
8.CG.05CassidyiteCa2Ni(PO4)2 · 2H2OTric.
8.CG.05CollinsiteCa2Mg(PO4)2 · 2H2OTric. 1 : P1
8.CG.05FairfielditeCa2Mn2+(PO4)2 · 2H2OTric. 1 : P1
8.CG.05GaititeCa2Zn(AsO4)2 · 2H2OTric. 1 : P1
8.CG.05MesseliteCa2Fe2+(PO4)2 · 2H2OTric. 1 : P1
8.CG.05ParabrandtiteCa2Mn2+(AsO4)2 · 2H2OTric. 1 : P1
8.CG.05AnorthoroseliteCa2Co(AsO4)2 · 2H2OTric.
8.CG.05TalmessiteCa2Mg(AsO4)2 · 2H2OTric. 1 : P1
8.CG.05HilliteCa2Zn(PO4)2 · 2H2OTric. 1 : P1
8.CG.05Unnamed (Fe2+-analogue of Parabrandtite)Ca2Fe2+(AsO4)2 · 2H2O
8.CG.10BrandtiteCa2Mn2+(AsO4)2 · 2H2OMon. 2/m : P21/b
8.CG.10RoseliteCa2Co(AsO4)2 · 2H2OMon. 2/m : P21/b
8.CG.10WendwilsoniteCa2Mg(AsO4)2 · 2H2OMon. 2/m : P21/b
8.CG.10ZincroseliteCa2Zn(AsO4)2 · 2H2OMon. 2/m : P21/b
8.CG.10RruffiteCa2Cu(AsO4)2 · 2H2OMon. 2/m : P21/b
8.CG.10Unnamed (Fe2+-analogue of Brandtite)Ca2Fe2+(AsO4)2 · 2H2O
8.CG.15FerrilotharmeyeriteCaZnFe3+(AsO4)2(OH) · H2OMon. 2/m : B2/m
8.CG.15LotharmeyeriteCaZn2(AsO4)2 · 2H2OMon. 2/m : B2/m
8.CG.15MawbyitePbFe3+2(AsO4)2(OH)2Mon. 2/m : B2/m
8.CG.15MounanaitePbFe3+2(VO4)2(OH,F)2Mon. 2/m : B2/m
8.CG.15ThometzekitePbCu2+2(AsO4)2 · 2H2OMon. 2/m : B2/m
8.CG.15TsumcoritePbZn2(AsO4)2 · 2H2OMon. 2/m : B2/m
8.CG.15CobaltlotharmeyeriteCaCo2(AsO4)2 · 2H2OMon. 2/m : B2/m
8.CG.15CabalzariteCaMg2(AsO4)2 · 2H2OMon. 2/m : B2/m
8.CG.15KrettnichitePbMn3+2(VO4)2(OH)2Mon. 2/m : B2/m
8.CG.15CobalttsumcoritePbCo2(AsO4)2 · 2H2OMon. 2/m : B2/m
8.CG.15NickellotharmeyeriteCaNi2(AsO4)2 · 2H2OMon. 2/m : B2/m
8.CG.15ManganlotharmeyeriteCaMn3+2(AsO4)2(OH)2Mon. 2/m : B2/m
8.CG.15SchneebergiteBiCo2(AsO4)2(OH) · H2OMon. 2/m : B2/m
8.CG.15NickelschneebergiteBiNi2(AsO4)2(OH) · H2OMon. 2/m : B2/m
8.CG.15YancowinnaitePbCuAl(AsO4)2OH · H2O Tric. 1 : P1
8.CG.15NickeltsumcoritePb(Ni,Fe3+)2(AsO4)2(H2O,OH)2Mon. 2/m : B2/m
8.CG.15MagnesiofluckiteCaMg(AsO3OH)2(H2O)2Tric. 1 : P1
8.CG.20GartrellitePbCuFe3+(AsO4)2(OH) · H2OTric. 1 : P1
8.CG.20HelmutwinkleritePbZn2(AsO4)2 · 2H2OTric. 1 : P1
8.CG.20ZincgartrellitePbZn2(AsO4)2(H2O,OH)2Tric. 1 : P1
8.CG.20RappolditePbCo2(AsO4)2 · 2H2OTric. 1 : P1
8.CG.20PhosphogartrellitePbCuFe3+(PO4)2(OH,H2O)2Tric. 1 : P1
8.CG.25Pottsite(Pb3xBi4-2x)(VO4)4 · H2O (0.8 < x < 1.0)Tet. 4/m : I41/a
8.CG.25Armellinoite-(Ce)Ca4Ce4+(AsO4)4 · H2OTet. 4/m : I41/a
8.CG.35NickeltalmessiteCa2Ni(AsO4)2 · 2H2OTric. 1 : P1
8.CG.55IrhtemiteCa4Mg(AsO4)2(HAsO4)2 · 4H2OMon.

Other InformationHide

IR Spectrum:
IR spectrum similar to gatrellite.
Notes:
Slowly soluble in warm dilute HCl.
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 LukrahniteHide

References for LukrahniteHide

Localities for LukrahniteHide

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

- 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.
Germany
 
  • Baden-Württemberg
    • Freiburg Region
      • Ortenaukreis
        • Oberwolfach
Kolitsch et al. (2010)
  • Saxony
    • Erzgebirgskreis
      • Schneeberg
        • Neustädtel
          • Wolfgangmaßen
            • Wolfgangmaßen mines (Wolfgangmaaßen mines)
Jambor et al. (2002) +1 other reference
Greece
 
  • Attica
    • East Attica
      • Lavreotiki
no description given yet] +1 other reference
          • Sounion
            • Cato Sounio mines
Rieck et al. (2018)
Italy
 
  • Liguria
    • Genoa
      • Ne
        • Reppia
Balestra (2017)
Namibia (TL)
 
  • Oshikoto Region
    • Tsumeb
Krause et al. (2001) +1 other reference
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