Alumolukrahnite
A valid IMA mineral species
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About Alumolukrahnite
Formula:
Ca[CuAl](AsO4)2(H2O,OH)2
Colour:
Apple green
Lustre:
Vitreous
Hardness:
3½
Specific Gravity:
4.094 (Calculated)
Crystal System:
Triclinic
Member of:
Name:
Named for being the aluminum (alumo) analogue of lukrahnite.
The Al analogue of lukrahnite.
Not chemically unique: compare attikaite, joteite (and also barahonaite-(Al)).
Not chemically unique: compare attikaite, joteite (and also barahonaite-(Al)).
Unique Identifiers
Mindat ID:
470380
Long-form identifier:
mindat:1:1:470380:4
GUID
(UUID V4):
(UUID V4):
73c9ad5c-98cc-4683-af0c-b776ebeeb659
IMA Classification of Alumolukrahnite
Classification of Alumolukrahnite
8.CG.
8 : PHOSPHATES, ARSENATES, VANADATES
C : Phosphates without additional anions, with H2O
G : With large and medium-sized cations, RO4:H2O = 1:1
8 : PHOSPHATES, ARSENATES, VANADATES
C : Phosphates without additional anions, with H2O
G : With large and medium-sized cations, RO4:H2O = 1:1
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 |
---|---|---|
Alkr | 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 Alumolukrahnite
Vitreous
Transparency:
Transparent, Translucent
Colour:
Apple green
Streak:
White
Hardness:
3½ on Mohs scale
Tenacity:
Brittle
Cleavage:
None Observed
Fracture:
Irregular/Uneven
Density:
4.094 g/cm3 (Calculated)
Comment:
Calculated using the empirical formula. The ideal formula gives 4.085 g/cm3.
Optical Data of Alumolukrahnite
Type:
Biaxial (+)
RI values:
nα = 1.730(1) nβ = 1.740(1) nγ = 1.760(1)
2V:
Calculated: 71°
Max Birefringence:
δ = 0.030
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:
High
Optical Extinction:
Even small crystal fragments exhibit undulatory extinction.
Pleochroism:
Non-pleochroic
Comments:
Optical orientation could not be determined.
Chemistry of Alumolukrahnite
Mindat Formula:
Ca[CuAl](AsO4)2(H2O,OH)2
Chemical Analysis
Empirical formulas:
Sample ID | Empirical Formula |
---|---|
1 | Ca1.01(Cu0.92Zn0.13)?1.05(Al0.96Fe0.01)?0.97(As0.985O4)2(OH)0.88(H2O)1.12 |
Sample references:
ID | Locality | Reference | Notes |
---|---|---|---|
1 | Jote Mine, Pampa Larga mining district, Tierra Amarilla, Copiapó Province, Atacama, Chile | by EPMA |
Crystallography of Alumolukrahnite
Crystal System:
Triclinic
Class (H-M):
1 - Pinacoidal
Space Group:
P1
Cell Parameters:
a = 5.343(5) Å, b = 5.501(5) Å, c = 7.329(5) Å
α = 67.72(2)°, β = 69.06(2)°, γ = 69.42(2)°
α = 67.72(2)°, β = 69.06(2)°, γ = 69.42(2)°
Ratio:
a:b:c = 0.971 : 1 : 1.332
Unit Cell V:
180.26 ų (Calculated from Unit Cell)
Z:
1
Morphology:
Crude diamond-shaped tablets intergrown in crude spherical aggregates.
Twinning:
None observed.
X-Ray Powder Diffraction
Powder Diffraction Data:
d-spacing | Intensity |
---|---|
4.89 Å | (86) |
3.396 Å | (100) |
3.196 Å | (70) |
3.115 Å | (70) |
2.882 Å | (90) |
2.714 Å | (52) |
2.488 Å | (82) |
1.694 Å | (65) |
Comments:
Jote Mine, Atacama, Chile. Data from the type description.
Type Occurrence of Alumolukrahnite
General Appearance of Type Material:
Crude diamond-shaped tablets up to about 0.1 mm intergrown in crude spherical aggregates to about 0.5 mm in diameter.
Place of Conservation of Type Material:
Cotype material is deposited in the collections of the Natural History Museum of Los Angeles County, 900 Exposition Boulevard, Los Angeles, CA 90007, USA, catalogue numbers 76256, 76257, and 76258.
Geological Setting of Type Material:
Late-stage, low-temperature, secondary alteration mineral. Mineralisation occurs in a narrow hydrothermal vein hosted by volcanoclastic rocks.
Associated Minerals at Type Locality:
Relationship of Alumolukrahnite to other Species
Member of:
Other Members of this group:
Cabalzarite | CaMg2(AsO4)2 · 2H2O | Mon. 2/m : B2/m |
Cobaltlotharmeyerite | CaCo2(AsO4)2 · 2H2O | Mon. 2/m : B2/m |
Cobalttsumcorite | PbCo2(AsO4)2 · 2H2O | Mon. 2/m : B2/m |
Ferrilotharmeyerite | CaZnFe3+(AsO4)2(OH) · H2O | Mon. 2/m : B2/m |
Gartrellite | PbCuFe3+(AsO4)2(OH) · H2O | Tric. 1 : P1 |
Helmutwinklerite | PbZn2(AsO4)2 · 2H2O | Tric. 1 : P1 |
Kaliochalcite | KCu2(SO4)2[(OH)(H2O)] | Mon. 2/m : B2/m |
Krettnichite | PbMn3+2(VO4)2(OH)2 | Mon. 2/m : B2/m |
Lotharmeyerite | CaZn2(AsO4)2 · 2H2O | Mon. 2/m : B2/m |
Lukrahnite | CaCuFe3+(AsO4)2(OH,H2O)2 | Tric. 1 : P1 |
Manganlotharmeyerite | CaMn3+2(AsO4)2(OH)2 | Mon. 2/m : B2/m |
Mawbyite | PbFe3+2(AsO4)2(OH)2 | Mon. 2/m : B2/m |
Mounanaite | PbFe3+2(VO4)2(OH,F)2 | Mon. 2/m : B2/m |
Natrochalcite | NaCu2(SO4)2(OH) · 2H2O | Mon. 2/m : B2/m |
Nickellotharmeyerite | CaNi2(AsO4)2 · 2H2O | Mon. 2/m : B2/m |
Nickelschneebergite | BiNi2(AsO4)2(OH) · H2O | Mon. 2/m : B2/m |
Nickeltsumcorite | Pb(Ni,Fe3+)2(AsO4)2(H2O,OH)2 | Mon. 2/m : B2/m |
Phosphogartrellite | PbCuFe3+(PO4)2(OH,H2O)2 | Tric. 1 : P1 |
Rappoldite | PbCo2(AsO4)2 · 2H2O | Tric. 1 : P1 |
Schneebergite | BiCo2(AsO4)2(OH) · H2O | Mon. 2/m : B2/m |
Thometzekite | PbCu2+2(AsO4)2 · 2H2O | Mon. 2/m : B2/m |
Tsumcorite | PbZn2(AsO4)2 · 2H2O | Mon. 2/m : B2/m |
Yancowinnaite | PbCuAl(AsO4)2OH · H2O | Tric. 1 : P1 |
Zincgartrellite | PbZn2(AsO4)2(H2O,OH)2 | Tric. 1 : P1 |
Common Associates
Associated Minerals Based on Photo Data:
5 photos of Alumolukrahnite associated with Barahonaite-(Al) | (Ca,Cu,Na,Fe3+,Al)12Al2(AsO4)8(OH,Cl)x · nH2O |
2 photos of Alumolukrahnite associated with Coronadite | Pb(Mn4+6Mn3+2)O16 |
1 photo of Alumolukrahnite associated with Microcline | K(AlSi3O8) |
Related Minerals - Strunz-mindat Grouping
8.CG. | Ca-Huréaulite | CaMn5(PO4)4 · 4H2O |
8.CG. | Fluckite | CaMn2+(AsO3OH)2 · 2H2O |
8.CG. | Dondoellite | Ca2Fe(PO4)2 · 2H2O |
8.CG.05 | Cassidyite | Ca2Ni(PO4)2 · 2H2O |
8.CG.05 | Collinsite | Ca2Mg(PO4)2 · 2H2O |
8.CG.05 | Fairfieldite | Ca2Mn2+(PO4)2 · 2H2O |
8.CG.05 | Gaitite | Ca2Zn(AsO4)2 · 2H2O |
8.CG.05 | Messelite | Ca2Fe2+(PO4)2 · 2H2O |
8.CG.05 | Parabrandtite | Ca2Mn2+(AsO4)2 · 2H2O |
8.CG.05 | Anorthoroselite | Ca2Co(AsO4)2 · 2H2O |
8.CG.05 | Talmessite | Ca2Mg(AsO4)2 · 2H2O |
8.CG.05 | Hillite | Ca2Zn(PO4)2 · 2H2O |
8.CG.05 | Unnamed (Fe2+-analogue of Parabrandtite) | Ca2Fe2+(AsO4)2 · 2H2O |
8.CG.10 | Brandtite | Ca2Mn2+(AsO4)2 · 2H2O |
8.CG.10 | Roselite | Ca2Co(AsO4)2 · 2H2O |
8.CG.10 | Wendwilsonite | Ca2Mg(AsO4)2 · 2H2O |
8.CG.10 | Zincroselite | Ca2Zn(AsO4)2 · 2H2O |
8.CG.10 | Rruffite | Ca2Cu(AsO4)2 · 2H2O |
8.CG.10 | Unnamed (Fe2+-analogue of Brandtite) | Ca2Fe2+(AsO4)2 · 2H2O |
8.CG.15 | Ferrilotharmeyerite | CaZnFe3+(AsO4)2(OH) · H2O |
8.CG.15 | Lotharmeyerite | CaZn2(AsO4)2 · 2H2O |
8.CG.15 | Mawbyite | PbFe3+2(AsO4)2(OH)2 |
8.CG.15 | Mounanaite | PbFe3+2(VO4)2(OH,F)2 |
8.CG.15 | Thometzekite | PbCu2+2(AsO4)2 · 2H2O |
8.CG.15 | Tsumcorite | PbZn2(AsO4)2 · 2H2O |
8.CG.15 | Cobaltlotharmeyerite | CaCo2(AsO4)2 · 2H2O |
8.CG.15 | Cabalzarite | CaMg2(AsO4)2 · 2H2O |
8.CG.15 | Krettnichite | PbMn3+2(VO4)2(OH)2 |
8.CG.15 | Cobalttsumcorite | PbCo2(AsO4)2 · 2H2O |
8.CG.15 | Nickellotharmeyerite | CaNi2(AsO4)2 · 2H2O |
8.CG.15 | Manganlotharmeyerite | CaMn3+2(AsO4)2(OH)2 |
8.CG.15 | Schneebergite | BiCo2(AsO4)2(OH) · H2O |
8.CG.15 | Nickelschneebergite | BiNi2(AsO4)2(OH) · H2O |
8.CG.15 | Yancowinnaite | PbCuAl(AsO4)2OH · H2O |
8.CG.15 | Nickeltsumcorite | Pb(Ni,Fe3+)2(AsO4)2(H2O,OH)2 |
8.CG.15 | Magnesiofluckite | CaMg(AsO3OH)2(H2O)2 |
8.CG.20 | Gartrellite | PbCuFe3+(AsO4)2(OH) · H2O |
8.CG.20 | Helmutwinklerite | PbZn2(AsO4)2 · 2H2O |
8.CG.20 | Zincgartrellite | PbZn2(AsO4)2(H2O,OH)2 |
8.CG.20 | Rappoldite | PbCo2(AsO4)2 · 2H2O |
8.CG.20 | Phosphogartrellite | PbCuFe3+(PO4)2(OH,H2O)2 |
8.CG.20 | Lukrahnite | CaCuFe3+(AsO4)2(OH,H2O)2 |
8.CG.25 | Pottsite | (Pb3xBi4-2x)(VO4)4 · H2O (0.8 < x < 1.0) |
8.CG.25 | Armellinoite-(Ce) | Ca4Ce4+(AsO4)4 · H2O |
8.CG.35 | Nickeltalmessite | Ca2Ni(AsO4)2 · 2H2O |
8.CG.55 | Irhtemite | Ca4Mg(AsO4)2(HAsO4)2 · 4H2O |
Fluorescence of Alumolukrahnite
Does not fluoresce with LW or SW UV.
Other Information
Notes:
Insoluble at room temperature in concentrated HCl or concentrated H2SO4.
The Raman spectrum exhibits general similarities to that reported by Frost et al. (2012) for gartrellite from the Ojuela mine. The most important bands are related to the AsO4 group.
The Raman spectrum exhibits general similarities to that reported by Frost et al. (2012) for gartrellite from the Ojuela mine. The most important bands are related to the AsO4 group.
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 Alumolukrahnite
mindat.org URL:
https://www.mindat.org/min-470380.html
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References for Alumolukrahnite
Localities for Alumolukrahnite
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.
Chile (TL) | |
| Miyawaki et al. (2022) |
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Jote Mine, Pampa Larga mining district, Tierra Amarilla, Copiapó Province, Atacama, Chile