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Fermiite

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Fermiit
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Fermiit
gelbgrüne Kristalle von Fermiit, Blue Lizard Mine, Red Canyon, Utah, USA; BB < 1 mm
Copyright: Joy Desor; Contribution: openpit
Location: USA/Utah/San Juan Co./White Canyon District/Red Canyon/Blue Lizard Mine
Mineral: Fermiite
Image: 1578067798
License: Usage for Mineralienatlas project only
Fermiit

gelbgrüne Kristalle von Fermiit, Blue Lizard Mine, Red Canyon, Utah, USA; BB < 1 mm

Copyright: Joy Desor
Contribution: openpit 2020-01-03
Locality: Blue Lizard Mine / Red Canyon / White Canyon District / San Juan Co. / Utah / USA

Collectors Summary

Color blass gelblichgrün
Streak color weiß
Lustre Glasglanz
Hardness (Mohs) 2.5
Cleavages keine
Fracture muschelig
Solubility +++ H2O; leicht zerfließend
Crystal System orthorhombisch, Pmn21
Morphology nach [010] gestreckte Prismen mit {010}, {001}, {001}, {110}, {011}, {011}, {101}, {101}

Chemism

Chemical formula

Na4(UO2)(SO4)3·3H2O

Empirical formula (analysis)

Na3.88(U1.05O2)(S0.99O4)3(H2O)3

Chemical composition

Natrium, Sauerstoff, Schwefel, Uran, Wasserstoff

Unit weight: 712.403194026 u; Number of atoms in the formula: 30.9

Info

Empirical formula:

Na3.88(U1.05O2)(S0.99O4)3(H2O)3

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)

Hydrogen

H

0.85

6

19.42

1.0079470

6.0476820

Oxygen

O

38.18

17

55.02

15.9994300

271.9903100

Sodium

Na

12.52

3.88

12.56

22.9897702

89.2003084

Sulfur

S

13.37

2.97

9.61

32.0655000

95.2345350

Uranium

U

35.08

1.05

3.40

238.0289130

249.9303587

Analysis wt%

Na2O : 17.10, UO3 : 42.77, SO3 : 33.85, H2O* : 7.70, Total : 101.42; WDX (Kampf et al. 2015); *berechnet

Strunz 9th edition incl. updates

7.EC.

7: Sulfate (Selenate, Tellurate, Chromate, Molybdate, Wolframate)
E: Uranylsulfate
C: Mit mittelgroßen und großen [Kationen]

Lapis Classification

VI/D.20-034

VI: SULFATE, CHROMATE, MOLYBDATE UND WOLFRAMATE
D: Wasserhaltige Sulfate, mit fremden Anionen
20: Uranylsulfate [UO2] 2+ – [SO4] 2-

IMA status

von der CNMNC anerkanntes Mineral; CNMNC Newsletter No. 23, Februar 2015

Mineral status

anerkanntes Mineral

Optical Properties

Color

blass gelblichgrün

Streak color

weiß

Diaphaneity (Transparency)

transparent

Lustre

Glasglanz

RI value α / ω / n

α = 1.527(1)

RI value β

β = 1.534(1)

RI value γ / ε

γ = 1.567(1)

2V angle

Biaxial (+) 50° (berechnet) 51(1) (gemessen)

Orientation

X = b, Y = c, Z = a

Dispersion

deutlich r < v

Absorption

X = Y < Z

Pleochroism

X, Y = farblos, Z = blass grünlichgelb

Optical Data Luminescence

Luminescence

hell grünlichweiße Floreszenz

Color LW-UV (365nm)

 

grün

LW-UV Intensity

stark

LW-UV Observation Frequency

immer (spezifisch)

MW-UV (320nm)

 

grün

MW-UV Intensity

stark

MW-UV Observation Frequency

immer (spezifisch)

Color SW-UV (254nm)

 

grün

SW-UV Intensity

stark

SW-UV Observation Frequency

immer (spezifisch)

Most Common Activator

(UO2)2+ (Uranyl-Ion) spezifisch

Afterglow (Persistant Luminescence)

keine Daten

Crystallography

Crystal System

orthorhombisch

Class (H-M)

mm2

Space Group number

31

Space Group

Pmn21

Cell parameters a (Å)

11.8407(12)

Cell parameters b (Å)

7.8695(5)

Cell parameters c (Å)

15.3255(19)

Cell parameters a/b or c/a

1.505

Cell parameters c/b

1.947

Cell parameters α

90°

Cell parameters β

90°

Cell parameters γ

90°

Z

4

Volume (ų)

1428.036

Crystal structure

strukturell verwandt mit Meisserit

X-Ray Powder Diffraction

7.71(43), 7.01(100), 6.00(49), 4.70(42), 3.476(85), 3.336(55), 3.131(57), 2.762(46)

XRD chart Fermiite

Calculated from d-spacing and intensity at 0.1541838 nm (Cu)

Morphology

nach [010] gestreckte Prismen mit {010}, {001}, {001}, {110}, {011}, {011}, {101}, {101}

Crystals 3D

Open larger view

Physical Properties

Hardness (Mohs)

2.5

Density (g/cm³)

3.23(2) (gemessen) 3.313 (berechnet)

3.313 ( ρ calc. Mineralienatlas )

Cleavages

keine

Fracture

muschelig

Tenacity

spröde

Radioactivity

vorhanden, da uranhaltig

Instability

+++ H2O; leicht zerfließend

(Co-)Type locality

(Co-)Type locality

USA/Utah/San Juan Co./White Canyon District/Red Canyon/Blue Lizard Mine

Type material

Natural History Museum of Los Angeles County, Kalifornien

Fersman Mineralogical Museum of the Russian Academy of Sciences, Moskau

Collection number of type material

65546, 65547 und 65548 (Los Angeles)

4607/1 (Moskau)

Preface

Associations

Oppenheimerit, Blödit, Bluelizardit, Chalkanthit, Epsomit, Gips, Hexahydrit, Kröhnkit, Manganoblödit, Sideronatrit, Tamarugit, Wetherillit

Name from

dem Experimentalphysiker Dr. Enrico Fermi (1901-1954)

Author (Name, Year)

Kampf, A.R., Plašil, J., Kasatkin, A.V., Marty, J., Čejka, J. (2015)

References

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, pp. 51-58

Kampf, A.R., Plášil, J., Kasatkin, A.V., Marty, J., Čejka, J. - 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 (2015), 1123-1142.

Other languages

German

Fermiit

English

Fermiite

Russian

Фермиит

CNMNC (IMA)-Number

IMA 2014-068

CNMNC symbol

Symbol

Fmi

Locations with GPS information

IDs

GUSID (Global unique identifier short form) XGJTlw--x0umGz1IJCHVYg
GUID (Global unique identifier) 9753625C-BE0F-4BC7-A61B-3D482421D562
Database ID 7869