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Fermiite

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About FermiiteHide

Dr. Enrico Fermi
Formula:
Na4(UO2)(SO4)3·3H2O
Colour:
Pale greenish-yellow
Lustre:
Vitreous
Hardness:
Specific Gravity:
3.23
Crystal System:
Orthorhombic
Name:
Named by A.R. Kampf, J. Plášil, A.V. Kasatkin, J. Marty, and J. Čejka in 2015 in honor of Dr. Enrico Fermi (29 September 1901, Rome, Italy - 28 November 1954, Chicago, Illinois, USA), Italian-American theoretical and experimental physicist. He made significant contributions to quantum theory, nuclear and particle physics, and statistical mechanics. He was awarded the 1938 Nobel Prize in Physics.
Structurally related to meisserite. Also structurally somewhat similar to oppenheimerite.

Chemically related to oppenheimerite, klaprothite, péligotite, ottohahnite; plášilite and natrozippeite (basic salts); belakovskiite and meisserite (sulfate-hydrosulfates).

As typical for uranyl sulfates, U polyhedra are square pentagonal bipyramids, with U atoms surrounded by 7 O atoms (two apical bonds of the bipyramid constitute the uranyl group). There are infinite chains formed by linking the adjacent bipyramids by two bridging sulfate groups. In fermiite the chain of [(UO2)(SO4)3]4– composition is parallel to [100]. The chains are linked through 5 different Na–O polyhedra.


Classification of FermiiteHide

Approved
Approval Year:
2014
First Published:
2015

Physical Properties of FermiiteHide

Vitreous
Transparency:
Transparent
Colour:
Pale greenish-yellow
Streak:
White
Hardness:
2½ on Mohs scale
Tenacity:
Brittle
Cleavage:
None Observed
no cleavage
Fracture:
Conchoidal
Density:
3.23 g/cm3 (Measured)    3.313 g/cm3 (Calculated)

Optical Data of FermiiteHide

Type:
Biaxial (+)
RI values:
nα = 1.527(1) nβ = 1.534(1) nγ = 1.567(1)
2V:
Measured: 51° , Calculated: 50°
Max Birefringence:
δ = 0.040
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Low
Dispersion:
r < v, distinct.
Pleochroism:
Visible
Comments:
X, Y = colourless, Z = pale greenish yellow; X = Y < Z

Chemical Properties of FermiiteHide

Formula:
Na4(UO2)(SO4)3·3H2O
IMA Formula:
Na4(UO2)(SO4)3 · 3H2O

Crystallography of FermiiteHide

Crystal System:
Orthorhombic
Class (H-M):
mm2 - Pyramidal
Space Group:
Pmn21
Setting:
Pmn21
Cell Parameters:
a = 11.8407(12) Å, b = 7.8695(5) Å, c = 15.3255(19) Å
Ratio:
a:b:c = 1.505 : 1 : 1.947
Unit Cell V:
1428 ų
Z:
4
Morphology:
Prisms

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
7.71(43)
7.01(100)
6.00(49)
4.70(42)
3.476(85)
3.336(55)
3.131(57)
2.762(46)
Comments:
From type description

Type Occurrence of FermiiteHide

General Appearance of Type Material:
prisms with {101} face habit, up to ~0.5 mm long; in subparallel or irregular aggregates. Other forms reported: {011}, {110}, {010}, {001}
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, California 90007, USA, catalogue numbers 65546, 65547 and 65548, and the Fersman Mineralogical Museum of the Russian
Geological Setting of Type Material:
As a secondary alteration phase
Associated Minerals at Type Locality:

Synonyms of FermiiteHide

Common AssociatesHide

AluminocoquimbiteFeAl(SO4)3 · 9H2O
AtacamiteCu2(OH)3Cl
BelakovskiiteNa7(UO2)(SO4)4(SO3OH)(H2O)3
BobcookiteNaAl(UO2)2(SO4)4·18H2O
BrochantiteCu4(SO4)(OH)6
CalciteCaCO3
CobaltoblöditeNa2Co(SO4)2•4H2O
CopiapiteFe2+Fe3+4(SO4)6(OH)2 · 20H2O
CoquimbiteFe2-xAlx(SO4)3 · 9H2O, x ~0.5
CyanotrichiteCu4Al2(SO4)(OH)12 · 2H2O
CyanotrichiteCu4Al2(SO4)(OH)12 · 2H2O
DickiteAl2(Si2O5)(OH)4
Dietrichite(Zn,Fe2+,Mn2+)Al2(SO4)4 · 22H2O
FerrinatriteNa3Fe(SO4)3 · 3H2O
GerhardtiteCu2(NO3)(OH)3
GordaiteNaZn4(SO4)(OH)6Cl · 6H2O
HaliteNaCl
KieseriteMgSO4 · H2O
LishizheniteZnFe2(SO4)4 · 14H2O
MeisseriteNa5(UO2)(SO4)3(SO3OH)(H2O)
MetavoltineNa6K2FeFe6(SO4)12O2 · 18H2O
NatrozippeiteNa5(UO2)8(SO4)4O5(OH)3 · 12H2O
PlášiliteNa(UO2)(SO4)(OH)·2H2O
PseudojohanniteCu3(OH)2[(UO2)4(SO4)2]· 12H2O
Rhomboclase(H5O2)Fe3+(SO4)2 · 2H2O
RömeriteFe2+Fe3+2(SO4)4 · 14H2O

Fluorescence of FermiiteHide

Bright greenishwhite fluorescence

Other InformationHide

Notes:
Easily soluble in RT H2O; Raman bands [cm-1]: 3540, 3465, 3285; (O–H stretching); 1606w (water bending); weak with shoulders: 1228, 1180, 1120, 1104, 1080 [ν3 sulfate groups antisymmetric stretching]; 1013s + 996s [ν1 sulfate groups symmetric stretching]; 922w [ν3 uranyl groups antisymmetric stretching]; 830vs with 860sh and 813sh [ν1 uranyl groups symmetric stretching]; 638w, 616w, 583w [ν4(δ) sulfate groups]; 506, 443, 384 [ν2(δ) sulfate bending]; 207 [ν2(δ) uranyl groups]; below 200 (lattice vibrations)
Health Risks:
Radioactive

References for FermiiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Kampf, A.R., Plašil, J., Kasatkin, A.V., Marty, J., Čejka,J. (2015) Fermiite, IMA 2014-068. CNMNC Newsletter No. 23, February 2015, page 54; Mineralogical Magazine: 79: 51-58.
Kampf, A.R., Plášil, J., Kasatkin, A.V., Marty, J., Čejka, J. (2015) Fermiite, Na4(UO2)(SO4)3·3H2O and oppenheimerite, Na2(UO2)(SO4)2·3H2O, two new uranyl sulfate minerals from the Blue Lizard mine, San Juan County, Utah, USA. Mineralogical Magazine: 79: 1123-1142.
Belakovskiy, D.I., Uvarova, Y., Gagne, O.C. (2016) New mineral names. American Mineralogist: 101: 1012-1019.

Internet Links for FermiiteHide

Localities for FermiiteHide

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.
USA (TL)
 
  • Utah
    • San Juan Co.
      • White Canyon District
        • Red Canyon
Kampf, A.R., Plašil, J., Kasatkin, A.V., Marty, J., Čejka,J. (2015) Fermiite, IMA 2014-068. CNMNC Newsletter No. 23, February 2015, page 54; Mineralogical Magazine, 79, 51-58; Kampf, A.R., Plášil, J., Kasatkin, A.V., Marty, J., Čejka, J. (2015): Fermiite, Na4(UO2)(SO4)3·3H2O and oppenheimerite, Na2(UO2)(SO4)2·3H2O, two new uranyl sulfate minerals from the Blue Lizard mine, San Juan County, Utah, USA. Mineralogical Magazine, 79, 1123-1142
Mineral and/or Locality  
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