Nollmotzite
A valid IMA mineral species
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About Nollmotzite
Markus Noller and Reinhard Motzigemba
Formula:
Mg[U5+(U6+O2)2O4F3] · 4H2O
Colour:
Deep-violet–brown
Lustre:
Vitreous
Crystal System:
Monoclinic
Name:
Nollmotzite was named in honour of two German mineral collectors. Markus Noller (born 16 May 1977) discovered this new mineral as collector and photograph; Reinhard Motzigemba (born 14 November 1952) collected it 2016 as assumed "ianthinite" in the Clara mine, Black Forest Mountains, Germany. The name nollmotzite combines the first four letters of their surnames.
May be confused with ianthinite.
One of the very few mineral species with pentavalent uranium, alongside with richetite, wyartite, and shinkolobweite.
Crystal structure based upon β-U3O8 topology.
One of the very few mineral species with pentavalent uranium, alongside with richetite, wyartite, and shinkolobweite.
Crystal structure based upon β-U3O8 topology.
Unique Identifiers
Mindat ID:
52853
Long-form identifier:
mindat:1:1:52853:9
IMA Classification of Nollmotzite
Approved
IMA Formula:
Mg[U5+(U6+O2)2O4F3](H2O)4
Approval year:
2018
First published:
2018
Type description reference:
Classification of Nollmotzite
4.GB.95
4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
G : Uranyl Hydroxides
B : With additional cations (K, Ca, Ba, Pb, etc.); with mainly UO2(O,OH)5 pentagonal polyhedra
4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
G : Uranyl Hydroxides
B : With additional cations (K, Ca, Ba, Pb, etc.); with mainly UO2(O,OH)5 pentagonal polyhedra
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 |
|---|---|---|
| Nmz | 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 Nollmotzite
Vitreous
Transparency:
Transparent
Colour:
Deep-violet–brown
Tenacity:
Brittle
Cleavage:
Perfect
{001}
{001}
Optical Data of Nollmotzite
Type:
Biaxial (-)
RI values:
nα = 1.615(3) nβ = 1.750(5) nγ = 1.765(5)
2V:
Measured: 37° (1)
Max. Birefringence:
δ = 0.150
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:
Strong, r > v
Pleochroism:
Strong
Comments:
X = colorless, Y = red–brown, Z = deep violet (X << Y < Z)
Chemistry of Nollmotzite
Mindat Formula:
Mg[U5+(U6+O2)2O4F3] · 4H2O
Element Weights:
Crystallography of Nollmotzite
Crystal System:
Monoclinic
Class (H-M):
m - Domatic
Space Group:
Bm
Setting:
Cm
Cell Parameters:
a = 7.1122(4) Å, b = 11.7733(7) Å, c = 8.2075(4) Å
β = 98.623(4)°
β = 98.623(4)°
Ratio:
a:b:c = 0.604 : 1 : 0.697
Unit Cell V:
676.98 ų
Z:
2
Morphology:
Thin prisms, elongated on [010], with chisel-like terminations. Crystals exhibit the forms (100), (-100), (001), (00-1), (120) and (-120).
Twinning:
Twinned by reticular merohedry
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 8.10 Å | (100) |
| 4.060 Å | (31) |
| 3.518 Å | (30) |
| 3.420 Å | (54) |
| 3.237 Å | (22) |
| 3.083 Å | (26) |
| 2.710 Å | (17) |
| 2.015 Å | (32) |
Reference:
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 7: Great Oxidation Event | <2.4 |
| 47f : [Uranyl (U⁶⁺) minerals] | |
| 47g : [Halogen-bearing surface weathering minerals] |
Type Occurrence of Nollmotzite
General Appearance of Type Material:
Thin prisms, deep-violet–brown, with chisel-like terminations up to about 0.3 mm in length.
Place of Conservation of Type Material:
Cotype material is deposited in the mineralogical collections of the Natural History Museum of Los Angeles County, 900 Exposition Blvd, Los Angeles, California, USA, catalogue numbers 66647, 66648 and 66649
Associated Minerals at Type Locality:
Reference:
Synonyms of Nollmotzite
Other Language Names for Nollmotzite
Dutch:Nollmotziet
German:Nollmotzit
Common Associates
Associations Based on Photo Data:
Related Minerals - Strunz-mindat Grouping
| 4.GB.05 | Rameauite | K2Ca(UO2)6O6(OH)4 · 6H2O |
| 4.GB.05 | Agrinierite | K2(Ca,Sr)[(UO2)3O3(OH)2]2 · 5H2O |
| 4.GB.05 | Compreignacite | K2(UO2)6O4(OH)6 · 7H2O |
| 4.GB.10 | Becquerelite | Ca(UO2)6O4(OH)6 · 8H2O |
| 4.GB.10 | Billietite | Ba(UO2)6O4(OH)6 · 4-8H2O |
| 4.GB.10 | Protasite | Ba(UO2)3O3(OH)2 · 3H2O |
| 4.GB.15 | Richetite | (Fe3+,Mg)Pb 8.6(UO2)36O36(OH)24 · 41H2O |
| 4.GB.20 | Calciouranoite | (Ca,Ba,Pb)U2O7 · 5H2O |
| 4.GB.20 | Bauranoite | Ba(UO2)2(OH)6 · 1-2H2O |
| 4.GB.20 | Metacalciouranoite | (Ca,Ba,Pb,K2)U2O7 · 2H2O |
| 4.GB.25 | Fourmarierite | Pb(UO2)4O3(OH)4 · 4H2O |
| 4.GB.30 | Wölsendorfite | Pb7(UO2)14O19(OH)4 · 12H2O |
| 4.GB.35 | Masuyite | Pb(UO2)3O3(OH)2 · 3H2O |
| 4.GB.40 | Vandendriesscheite | PbU7O22 · 12H2O |
| 4.GB.40 | Metavandendriesscheite | PbU7O22 · nH2O n < 12 |
| 4.GB.45 | Vandenbrandeite | Cu(UO2)(OH)4 |
| 4.GB.50 | Sayrite | Pb2(UO2)5O6(OH)2 · 4H2O |
| 4.GB.55 | Curite | Pb3(H2O)2[(UO2)4O4(OH)3]2 |
| 4.GB.60 | Iriginite | (UO2)Mo2O7 · 3H2O |
| 4.GB.65 | Uranosphaerite | Bi(UO2)O2(OH) |
| 4.GB.70 | Holfertite | CaxU6+2-xTi(O8-xOH4x) · 3H2O |
| 4.GB.75 | Carlosbarbosaite | (UO2)2Nb2O6(OH)2 · 2H2O |
| 4.GB.80 | Gauthierite | KPb[(UO2)7O5(OH)7] · 8H2O |
| 4.GB.85 | Kroupaite | KPb0.5[(UO2)8O4(OH)10] · 10H2O |
| 4.GB.90 | Leesite | K(H2O)2[(UO2)4O2(OH)5] · 3H2O |
| 4.GB.95 | Shinkolobweite | Pb1.333[U5+O(OH)(UO2)5O4.67(OH)5.33](H2O)5 |
Radioactivity
Fluorescence of Nollmotzite
Non-fluorescent under longwave and shortwave ultraviolet radiation.
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 Nollmotzite
mindat.org URL:
https://www.mindat.org/min-52853.html
Please feel free to link to this page.
Please feel free to link to this page.
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External Links:
Mineral Dealers:
References for Nollmotzite
Reference List:
Hålenius, U., Hatert, F., Pasero, M., Mills, S. J. (2018) New minerals and nomenclature modifications approved in 2018. Mineralogical Magazine, 82 (2). 445-451 doi:10.1180/mgm.2018.71p.446
Localities for Nollmotzite
Showing 1 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 (TL) | |
| Mineralogical Magazine: 82: 445-451. +2 other references |
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Clara Mine, Oberwolfach, Ortenaukreis, Freiburg Region, Baden-Württemberg, Germany