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Nollmotzite

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About NollmotziteHide

06328880015352476659829.jpg
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.

Crystal structure based upon β-U3O8 topology.


Classification of NollmotziteHide

Approved
Approval Year:
2018
First Published:
2018

Physical Properties of NollmotziteHide

Vitreous
Transparency:
Transparent
Colour:
Deep-violet–brown
Tenacity:
Brittle
Cleavage:
Perfect
{001}

Optical Data of NollmotziteHide

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
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
High
Dispersion:
Strong, r > v
Pleochroism:
Strong
Comments:
X = colorless, Y = red–brown, Z = deep violet (X << Y < Z)

Chemical Properties of NollmotziteHide

Formula:
Mg[U5+(U6+O2)2O4F3]·4H2O
IMA Formula:
Mg[U5+(U6+O2)2O4F3] · 4H2O

Crystallography of NollmotziteHide

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)°
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 DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
8.10Å(100)
4.060Å(31)
3.518Å(30)
3.420Å(54)
3.237Å(22)
3.083Å(26)
2.710Å(17)
2.015Å(32)

Type Occurrence of NollmotziteHide

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:
Plášil, J., Kampf, A.R., Škoda, R. and Čejka, J. (2018) Nollmotzite, Mg[UV(UVIO2)2O4F3].4H2O, the first natural uranium oxide containing fluorine. Acta Crystallographica: B74: 372–369.

Synonyms of NollmotziteHide

Fluorescence of NollmotziteHide

Non-fluorescent under longwave and shortwave ultraviolet radiation.

Other InformationHide

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 NollmotziteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Plášil, J., Kampf, A.R., Škoda, R. and Čejka, J. (2018) Nollmotzite, IMA 2017-100. CNMNC Newsletter No. 42, April 2018, page 446; Mineralogical Magazine: 82: 445–451.
Plášil, J., Kampf, A.R., Škoda, R. and Čejka, J. (2018) Nollmotzite, Mg[UV(UVIO2)2O4F3].4H2O, the first natural uranium oxide containing fluorine. Acta Crystallographica: B74: 372–369. DOI: 10.1107/S2052520618007321.

Internet Links for NollmotziteHide

Localities for NollmotziteHide

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 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 (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Germany (TL)
 
  • Baden-Württemberg
    • Freiburg
      • Ortenaukreis
        • Oberwolfach
Plášil, J., Kampf, A.R., Škoda, R. and Čejka, J. (2018) Nollmotzite, IMA 2017-100. CNMNC Newsletter No. 42, April 2018, page 446; Mineralogical Magazine: 82: 445–451; Plášil, J., Kampf, A.R., Škoda, R., Čejka, J. (2018): Nollmotzite, Mg[UV(UVIO2)2O4F3]·4H2O, the first natural uranium oxide containing fluorine. Acta Crystallographica, B74, 362-369.
 
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