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Lukrahnite

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Formula:
Ca(Cu,Zn)(Fe3+,Zn)(AsO4)2 · 2(H2O,OH)
System:
Triclinic
Colour:
yellow
Lustre:
Dull, Earthy
Hardness:
5
Name:
For Ludger Krahn (b. 1957), mineral collector of Krefeld, Germany, who provided the initial specimen for study.
Tsumcorite Group.

Ca analogue of Gartrellite.


Classification of Lukrahnite

Approved
Approval Year:
1999
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

Physical Properties of Lukrahnite

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

Optical Data of Lukrahnite

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

Chemical Properties of Lukrahnite

Formula:
Ca(Cu,Zn)(Fe3+,Zn)(AsO4)2 · 2(H2O,OH)
IMA Formula:
Ca(Cu,Zn)(Fe3+,Zn)(AsO4)2(OH,H2O)2
Elements listed in formula:
Analytical Data:
Average values out of nine sets of electron microprobe data (with H2O calculated to give OH + H2O = 2)
CaO   (11.42%)
NiO   (0.05%)
CoO   (0.15%)
CuO   (10.00%)
ZnO   (8.19%)
PbO   (0.69%)
Al2O3 (0.37%)
Fe2O3 (13.75%)
P2O5  (0.16%)
As2O5 (47.72%)
SO3   (0.09%)
H2O   (6.21%)

Total: 98.80 wt.%

Crystallography of Lukrahnite

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 Volume:
V 187.8 ų
Z:
1
Twinning:
None mentioned
X-Ray Powder Diffraction Data:
d-spacingIntensity
4.953 (22)
4.444 (20)
3.416 (100)
3.186 (40)
2.927 (64)
2.832 (26)
2.700 (30)
2.533 (30)
2.468 (25)

Type Occurrence of Lukrahnite

Empirical Formula:
(Ca0.97Pb0.01Co0.01)Σ0.99(Cu0.60Zn0.48)Σ1.08(Fe3+0.82Al0.03)Σ0.85[(AsO4)1.98(PO4)0.01(SO4)0.01]Σ2.00[(H2O)1.30(OH)0.70]Σ2.00

Relationship of Lukrahnite to other Species

Other Members of Group:
CabalzariteCa(Mg,Al,Fe3+)2(AsO4)2(OH,H2O)2
CobaltlotharmeyeriteCa(Co,Fe3+,Ni)2(AsO4)2 · 2(H2O,OH)
CobalttsumcoritePb(Co,Fe3+,Ni)2(AsO4)2 · 2(H2O,OH)
FerrilotharmeyeriteCa(Fe3+,Zn)2(AsO4)2 · 2(OH,H2O)
GartrellitePb(Cu,Fe3+,Zn)2(AsO4,SO4)2 · 2(H2O,OH)
HelmutwinkleritePb(Zn,Cu)2(AsO4)2 · 2H2O
KaliochalciteKCu2(SO4)2[(OH)(H2O)]
KrettnichitePbMn23+(VO4)2(OH)2
LotharmeyeriteCa(Zn,Mn3+)2(AsO4)2 · 2(H2O,OH)
ManganlotharmeyeriteCaMn23+(AsO4)2(OH)2
MawbyitePb(Fe3+,Zn)2(AsO4)2 · 2(OH,H2O)
MounanaitePbFe23+(VO4)2(OH,F)2
NatrochalciteNaCu2(SO4)2(OH) · 2H2O
Nickelschneebergite(Bi3+,Ca)(Ni,Co,Fe3+)2(AsO4)2 · 2(OH,H2O)
NickeltsumcoritePb(Ni,Fe3+)2(AsO4)2(H2O,OH)2
PhosphogartrellitePb(Cu,Fe3+)2(PO4,AsO4)2 · 2(H2O,OH)
RappolditePb(Co,Ni,Zn)2(AsO4)2 · 2H2O
Schneebergite(Bi3+,Ca)(Co,Ni,Fe3+)2(AsO4)2(OH,H2O)2
ThometzekitePb(Cu,Zn)2(AsO4,SO4)2 · 2(H2O,OH)
TsumcoritePbZn2(AsO4)2 · 2H2O
YancowinnaitePbCuAl(AsO4)2OH · H2O
ZincgartrellitePb(Zn,Fe3+,Cu)2(AsO4)2 · 2(H2O,OH)
8.CG.05CassidyiteCa2(Ni2+,Mg)(PO4)2 · 2H2O
8.CG.05CollinsiteCa2(Mg,Fe2+)(PO4)2 · 2H2O
8.CG.05FairfielditeCa2(Mn2+,Fe2+)(PO4)2 · 2H2O
8.CG.05GaititeCa2Zn(AsO4)2 · 2H2O
8.CG.05MesseliteCa2(Fe2+,Mn2+)(PO4)2 · 2H2O
8.CG.05ParabrandtiteCa2Mn2+(AsO4)2 · 2H2O
8.CG.05β-RoseliteCa2(Co2+,Mg)(AsO4)2 · 2H2O
8.CG.05TalmessiteCa2Mg(AsO4)2 · 2H2O
8.CG.05HilliteCa2(Zn,Mg)(PO4)2 · 2 H2O
8.CG.10BrandtiteCa2(Mn2+,Mg)(AsO4)2 · 2H2O
8.CG.10RoseliteCa2(Co2+,Mg)(AsO4)2 · 2H2O
8.CG.10WendwilsoniteCa2Mg(AsO4)2 · 2H2O
8.CG.10ZincroseliteCa2Zn(AsO4)2 · 2H2O
8.CG.10RruffiteCa2Cu(AsO4)2 · 2H2O
8.CG.15FerrilotharmeyeriteCa(Fe3+,Zn)2(AsO4)2 · 2(OH,H2O)
8.CG.15LotharmeyeriteCa(Zn,Mn3+)2(AsO4)2 · 2(H2O,OH)
8.CG.15MawbyitePb(Fe3+,Zn)2(AsO4)2 · 2(OH,H2O)
8.CG.15MounanaitePbFe23+(VO4)2(OH,F)2
8.CG.15ThometzekitePb(Cu,Zn)2(AsO4,SO4)2 · 2(H2O,OH)
8.CG.15TsumcoritePbZn2(AsO4)2 · 2H2O
8.CG.15CobaltlotharmeyeriteCa(Co,Fe3+,Ni)2(AsO4)2 · 2(H2O,OH)
8.CG.15CabalzariteCa(Mg,Al,Fe3+)2(AsO4)2(OH,H2O)2
8.CG.15KrettnichitePbMn23+(VO4)2(OH)2
8.CG.15CobalttsumcoritePb(Co,Fe3+,Ni)2(AsO4)2 · 2(H2O,OH)
8.CG.15NickellotharmeyeriteCa(Ni,Fe3+,Co)2(AsO4)2 · 2(H2O,OH)
8.CG.15ManganlotharmeyeriteCaMn23+(AsO4)2(OH)2
8.CG.15Schneebergite(Bi3+,Ca)(Co,Ni,Fe3+)2(AsO4)2(OH,H2O)2
8.CG.15Nickelschneebergite(Bi3+,Ca)(Ni,Co,Fe3+)2(AsO4)2 · 2(OH,H2O)
8.CG.20GartrellitePb(Cu,Fe3+,Zn)2(AsO4,SO4)2 · 2(H2O,OH)
8.CG.20HelmutwinkleritePb(Zn,Cu)2(AsO4)2 · 2H2O
8.CG.20ZincgartrellitePb(Zn,Fe3+,Cu)2(AsO4)2 · 2(H2O,OH)
8.CG.20RappolditePb(Co,Ni,Zn)2(AsO4)2 · 2H2O
8.CG.20PhosphogartrellitePb(Cu,Fe3+)2(PO4,AsO4)2 · 2(H2O,OH)
8.CG.25Pottsite(Pb3xBi4-2x)(VO4)4·H2O (0.8 < x < 1.0)
8.CG.35NickeltalmessiteCa2Ni(AsO4)2 · 2H2O

Other Names for Lukrahnite

Name in Other Languages:
German:Lukrahnit
Spanish:Lukrahnita

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.

References for Lukrahnite

Reference List:
Krause, W., Blass, G., Bernhardt, H.-J. and Effenberger, H. (2001): Lukrahnite, CaCuFe3+(AsO4)2[(H2O)(OH)], the calcium analogue of gartrellite. Neues Jahrbuch für Mineralogie, Monatshefte (2001): 481-492.

Internet Links for Lukrahnite

mindat.org URL:
https://www.mindat.org/min-11010.html
Please feel free to link to this page.

Localities for Lukrahnite

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.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
Germany
 
  • Baden-Württemberg
    • Black Forest
      • Wolfach
        • Oberwolfach
          • Rankach valley
U. Kolitsch, J. Gröbner, F. Brandstätter and R. Bayerl (2010): Neufunde aus der Grube Clara im mittleren Schwarzwald (IV): Calcioandyrobertsit, Cotunnit, Gerhardtit, Khaidarkanit, Lukrahnit, Mckinstryit, Moolooit, Rhabdophan-(La), Rouait und Uricit. Lapis 35 (9), 22-27; 62 (in German).
  • Saxony
    • Erzgebirge
      • Schneeberg District
        • Wolfgang Maaßen Mine field
Lapis 30(7/8):68 (2005)
Greece
 
  • Attikí Prefecture (Attica; Attika)
    • Lavrion District (Laurion; Laurium)
Kolitsch, U., Rieck, B., Brandstätter, F., Schreiber, F., Fabritz, K. H., Blaß, G. & Gröbner, J. (2014): Neufunde aus dem altem Bergbau und den Schlacken von Lavrion (I). Mineralien-Welt 25 (1), 60-75 (in German). [identification announced; no description given yet]
Namibia (TL)
 
  • Otjikoto Region (Oshikoto)
    • Tsumeb
Neues. Jahrb. Mineral. Mon., 481-492.
Mineral and/or Locality  
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