Cobaltlotharmeyerite
A valid IMA mineral species
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About Cobaltlotharmeyerite
Julius Lothar Meyer (1830-1895)
Formula:
CaCo2(AsO4)2 · 2H2O
Co may be replaced by minor Fe3+.
Colour:
Light brown to reddish brown
Lustre:
Vitreous
Hardness:
4½
Specific Gravity:
4.13 (Calculated)
Crystal System:
Monoclinic
Member of:
Name:
Named as the cobalt-dominant analogue of lotharmeyerite.
Unique Identifiers
Mindat ID:
6885
Long-form identifier:
mindat:1:1:6885:3
IMA Classification of Cobaltlotharmeyerite
Approved
IMA Formula:
CaCo2+2(As5+O4)2·2H2O
Approval year:
1997
First published:
1999
Classification of Cobaltlotharmeyerite
8.CG.15
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 for Standard |
|---|---|---|
| Clmy | 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 Cobaltlotharmeyerite
Vitreous
Transparency:
Translucent
Colour:
Light brown to reddish brown
Streak:
Light brown
Hardness:
4½ on Mohs scale
Cleavage:
None Observed
Density:
4.13 g/cm3 (Calculated)
Optical Data of Cobaltlotharmeyerite
Type:
Biaxial (+)
RI values:
nα = 1.78 nβ = 1.79(1) nγ = 1.85(2)
2V:
Measured: 48° (5), Calculated: 46°
Max. Birefringence:
δ = 0.070
Based on recorded range of RI values above.
Based on recorded range of RI values above.
Interference Colours:
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
Surface Relief:
Very High (positive)
Relative to Canada balsam mounting medium (n ≈ 1.537).
Relative to Canada balsam mounting medium (n ≈ 1.537).
This shows the grain boundary and Becke line effect under plane-polarised
light, based on the contrast between this mineral's average refractive
index and the mounting medium. It does not take into account mineral
colouration.
In focus
Interference Figure:
This shows the idealized biaxial acute bisectrix (Bxa) interference figure
- the conoscopic view for a grain cut perpendicular to the acute bisectrix, using
this mineral's 2V. The two small white dots mark the melatopes - the points
where the two optic axes emerge - and are shown only when they fall within the
field of view. The coloured bands are isochromatics, and the dark bands are
isogyres.
Rotate the stage: at 0°/90° the isogyres form a cross through the melatopes; at 45° they pull apart into curved hyperbolas. That splitting on rotation - absent in a uniaxial figure - is the standard diagnostic test for telling biaxial minerals from uniaxial ones. If 2V is large, the melatopes may fall outside the field of view, as they often do at the microscope too.
Rotate the stage: at 0°/90° the isogyres form a cross through the melatopes; at 45° they pull apart into curved hyperbolas. That splitting on rotation - absent in a uniaxial figure - is the standard diagnostic test for telling biaxial minerals from uniaxial ones. If 2V is large, the melatopes may fall outside the field of view, as they often do at the microscope too.
Dispersion:
r > v distinct
Optical Extinction:
Y = b; X ∧ c = 10° (in the obtuse of β).
Pleochroism:
Strong
Comments:
X = yellow; Y = brown; Z = pale yellow.
Comments:
α calculated.
Absorption: Y > X > Z.
Absorption: Y > X > Z.
Chemistry of Cobaltlotharmeyerite
Mindat Formula:
CaCo2(AsO4)2 · 2H2O
Co may be replaced by minor Fe3+.
Co may be replaced by minor Fe3+.
Element Weights:
Crystallography of Cobaltlotharmeyerite
Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
B2/m
Setting:
C2/m
Cell Parameters:
a = 9.024(1) Å, b = 6.230(1) Å, c = 7.421(1) Å
β = 115.15(1)°
β = 115.15(1)°
Ratio:
a:b:c = 1.448 : 1 : 1.191
Unit Cell V:
377.65 ų (Calculated from Unit Cell)
Z:
2
Morphology:
Tabular on {101}, elongate parallel to [010], and showing a lance-like termination at an angle of ~80°.
Comment:
Data for type material.
Crystal Structure
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CIF File Best | x | y | z | a | b | c
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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) |
|---|---|---|---|---|---|---|---|
| 0014902 | Cobaltlotharmeyerite | Krause W, Effenberger H, Bernhardt H J, Martin M (1999) Cobaltlotharmeyerite, Ca(Co,Fe,Ni)2(AsO4)2(OH,H2O)2, a new mineral from Schneeberg, Germany Neues Jahrbuch fur Mineralogie, Monatshefte 1999 505-517 | 1999 | Schneeberg, Saxony, Germany | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 4.955 Å | (66) |
| 3.398 Å | (54) |
| 3.188 Å | (85) |
| 3.115 Å | (51) |
| 2.972 Å | (82) |
| 2.828 Å | (88) |
| 2.545 Å | (100) |
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 Cobaltlotharmeyerite
General Appearance of Type Material:
Fan-shaped aggregates and crusts on quartz. Thin-tabular, bladed crystals to 0.1 mm, elongated on [010].
Place of Conservation of Type Material:
Technische Universität, Bergakademie Freiberg, Freiberg, Germany.
Associated Minerals at Type Locality:
Synonyms of Cobaltlotharmeyerite
Other Language Names for Cobaltlotharmeyerite
Varieties of Cobaltlotharmeyerite
Relationship of Cobaltlotharmeyerite to other Species
Member of:
Other Members of Tsumcorite Group:
| Alumolukrahnite | Ca[CuAl](AsO4)2(H2O,OH)2 | Tric. 1 : P1 |
| Cabalzarite | CaMg2(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)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
Associations Based on Photo Data:
| 52 photos of Cobaltlotharmeyerite associated with Cobaltaustinite | CaCo(AsO4)(OH) |
| 32 photos of Cobaltlotharmeyerite associated with Dolomite | CaMg(CO3)2 |
| 27 photos of Cobaltlotharmeyerite associated with Roselite | Ca2Co(AsO4)2 · 2H2O |
| 9 photos of Cobaltlotharmeyerite associated with Wendwilsonite | Ca2Mg(AsO4)2 · 2H2O |
| 9 photos of Cobaltlotharmeyerite associated with Quartz | SiO2 |
| 7 photos of Cobaltlotharmeyerite associated with Spherocobaltite | CoCO3 |
| 6 photos of Cobaltlotharmeyerite associated with Erythrite | Co3(AsO4)2 · 8H2O |
| 6 photos of Cobaltlotharmeyerite associated with Calcite | CaCO3 |
| 6 photos of Cobaltlotharmeyerite associated with 'Cobalt-bearing Austinite' | Ca(Zn,Co)AsO4(OH) |
| 5 photos of Cobaltlotharmeyerite associated with Talmessite | Ca2Mg(AsO4)2 · 2H2O |
Related Minerals - Strunz-mindat Grouping
| 8.CG. | Fluckite | CaMn2+(AsO3OH)2 · 2H2O |
| 8.CG. | Dondoellite | Ca2Fe(PO4)2 · 2H2O |
| 8.CG. | 'Ca-Huréaulite' | CaMn5(PO4)4 · 4H2O |
| 8.CG. | Alumolukrahnite | Ca[CuAl](AsO4)2(H2O,OH)2 |
| 8.CG.05 | Parabrandtite | Ca2Mn2+(AsO4)2 · 2H2O |
| 8.CG.05 | Talmessite | Ca2Mg(AsO4)2 · 2H2O |
| 8.CG.05 | Collinsite | Ca2Mg(PO4)2 · 2H2O |
| 8.CG.05 | Messelite | Ca2Fe2+(PO4)2 · 2H2O |
| 8.CG.05 | Gaitite | Ca2Zn(AsO4)2 · 2H2O |
| 8.CG.05 | Anorthoroselite | Ca2Co(AsO4)2 · 2H2O |
| 8.CG.05 | Cassidyite | Ca2Ni(PO4)2 · 2H2O |
| 8.CG.05 | Fairfieldite | Ca2Mn2+(PO4)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 | Zincroselite | Ca2Zn(AsO4)2 · 2H2O |
| 8.CG.10 | Roselite | Ca2Co(AsO4)2 · 2H2O |
| 8.CG.10 | Rruffite | Ca2Cu(AsO4)2 · 2H2O |
| 8.CG.10 | Wendwilsonite | Ca2Mg(AsO4)2 · 2H2O |
| 8.CG.10 | Brandtite | Ca2Mn2+(AsO4)2 · 2H2O |
| 8.CG.10 | 'Unnamed (Fe2+-analogue of Brandtite)' | Ca2Fe2+(AsO4)2 · 2H2O |
| 8.CG.15 | Mawbyite | PbFe3+2(AsO4)2(OH)2 |
| 8.CG.15 | Thometzekite | PbCu2+2(AsO4)2 · 2H2O |
| 8.CG.15 | Yancowinnaite | PbCuAl(AsO4)2OH · H2O |
| 8.CG.15 | Schneebergite | BiCo2(AsO4)2(OH) · H2O |
| 8.CG.15 | Cabalzarite | CaMg2(AsO4)2 · 2H2O |
| 8.CG.15 | Nickelschneebergite | BiNi2(AsO4)2(OH) · H2O |
| 8.CG.15 | Lotharmeyerite | CaZn2(AsO4)2 · 2H2O |
| 8.CG.15 | Nickeltsumcorite | Pb(Ni,Fe3+)2(AsO4)2(H2O,OH)2 |
| 8.CG.15 | Magnesiofluckite | CaMg(AsO3OH)2(H2O)2 |
| 8.CG.15 | Krettnichite | PbMn3+2(VO4)2(OH)2 |
| 8.CG.15 | Cobalttsumcorite | PbCo2(AsO4)2 · 2H2O |
| 8.CG.15 | Manganlotharmeyerite | CaMn3+2(AsO4)2(OH)2 |
| 8.CG.15 | Tsumcorite | PbZn2(AsO4)2 · 2H2O |
| 8.CG.15 | Ferrilotharmeyerite | CaZnFe3+(AsO4)2(OH) · H2O |
| 8.CG.15 | Mounanaite | PbFe3+2(VO4)2(OH)2 |
| 8.CG.15 | Nickellotharmeyerite | CaNi2(AsO4)2 · 2H2O |
| 8.CG.20 | Lukrahnite | CaCuFe3+(AsO4)2(OH,H2O)2 |
| 8.CG.20 | Helmutwinklerite | PbZn2(AsO4)2 · 2H2O |
| 8.CG.20 | Phosphogartrellite | PbCuFe3+(PO4)2(OH,H2O)2 |
| 8.CG.20 | Gartrellite | PbCuFe3+(AsO4)2(OH) · H2O |
| 8.CG.20 | Zincgartrellite | PbZn2(AsO4)2(H2O,OH)2 |
| 8.CG.20 | Rappoldite | PbCo2(AsO4)2 · 2H2O |
| 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 Cobaltlotharmeyerite
Not fluorescent.
Other Information
Notes:
Slowly soluble in warm 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 Cobaltlotharmeyerite
mindat.org URL:
https://www.mindat.org/min-6885.html
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Please feel free to link to this page.
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References for Cobaltlotharmeyerite
Reference List:
Localities for Cobaltlotharmeyerite
Showing 13 localities.
symbol to view information about a locality.
The 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).
All localities listed without proper references should be considered as questionable.
Germany | |
| Lapis 30 (7/8) |
| Effenberger et al. (2000) +1 other reference | |
| Th. Witzke collection | |
| Lapis 30 (7/8) |
| Krause et al. (1999) |
Morocco | |
| Favreau et al. (2006) |
| Favreau et al. (2006) | |
| [var: Manganese-bearing Cobaltlotharmeyerite] Favreau et al. (2006) |
| Georges FAVREAU collection & EDX ... | |
| Favreau et al. (2006) | |
Spain | |
| Rewitzer et al. (2018) |
| Calvo Rebollar et al. (2022) |
Quick NavTopAbout CobaltlotharmeyeriteUnique IdentifiersIMA Classification Classification Mineral SymbolsPhysical Properties Optical Data Chemistry Crystallography Crystal StructureX-Ray Powder DiffractionGeological EnvironmentType Occurrence SynonymsOther LanguagesVarietiesRelationshipsCommon AssociatesStrunz-MindatFluorescence Other InformationInternet Links References Localities Locality List
Aghbar Mine, Aghbar, Tansifte Caïdat, Agdz Cercle, Zagora Province, Drâa-Tafilalet Region, Morocco