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Rameauite (Rameauit)

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Rameauit
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Rameauit

Needles of rameauite on rhyolite. Rhyolite Ridge, Silver Peak District, Esmeralda Co., Nevada, USA; Field of View: 1 mm

Copyright: Brent Thorne
Contribution: Stefan 2016-06-21
Locality: Rhyolite Ridge / Silver Peak District / Esmeralda Co. / Nevada / USA

Collectors Summary

Color orange
Crystal System monoklin, C2/c

Chemism

Chemical formula

K2CaU6+6O20·6H2O

Empirical formula (analysis)

K1.87(Ca1.10Sr0.04)Σ1.14[(UO2)6O6(OH)4.15]·6H2O

Additional chem. information

Uranyl-Oxid

Chemical composition

Calcium, Kalium, Sauerstoff, Uran, Wasserstoff

Unit weight: 2015.54069625 u; Number of atoms in the formula: 53.31

Info

Empirical formula:

K1.87(Ca1.10Sr0.04)[(UO2)6O6(OH)4.15]·6H2O

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)

Hydrogen

H

0.81

16.15

30.29

1.0079470

16.2783441

Oxygen

O

22.35

28.15

52.80

15.9994300

450.3839545

Potassium

K

3.63

1.87

3.51

39.0983100

73.1138397

Calcium

Ca

2.19

1.1

2.06

40.0784000

44.0862400

Strontium

Sr

0.17

0.04

0.08

87.6210000

3.5048400

Uranium

U

70.86

6

11.25

238.0289130

1,428.1734780

Analysis wt%

K2O : 5.00, CaO : 2.40, UO3 : 84.00, H2O : 8.20 (Ref: Mineralogical Magazine 72)

Strunz 9th edition incl. updates

4.GB.05

4: Oxide, Hydroxide (Oxide, Hydroxide, V[5,6]-Vanadate, Arsenite, Antimonite, Bismutite, Sulfite, Selenite, Tellurite, Iodate)
G: Uranylhydroxide
B: Mit zusätzlichen Kationen ([K], [Ca], [Ba], [Pb], etc.) mit vorwiegend UO2(O,OH)5 pentagonalen Polyedern
05:Compreignacit-Gruppe

Lapis Classification

IV/H.02-020

IV: OXIDE
H: Uranyl([UO2] 2+)-Hydroxide und -Hydrate

Classification by Hölzel

4.GB.360

4: OXIDES
G: Vanadin, Uranyl Oxides and Hydroxides
B: Uranylhydroxides-Hydrates
3: With Alkali Compreignacite-Group

Dana 8th edition

05.05.02.01

05: Oxides Containing Uranium and Thorium
05: Oxides Containing Uranium and Thorium with alkaline and alkaline-earth elements (hydrated)

IMA status

Anerkannt von der CNMNC

Mineral status

anerkanntes Mineral

Optical Properties

Color

orange

RI value β

1.95

RI value γ / ε

1.97

2V angle

Biaxial (-) 32°

Crystallography

Crystal System

monoklin

Class (H-M)

2/m

Space Group number

15

Space Group

C2/c

Cell parameters a (Å)

13.9458(19)

Cell parameters b (Å)

14.3105(19)

Cell parameters c (Å)

13.8959(18)

Cell parameters a/b or c/a

0.975

Cell parameters c/b

0.971

Cell parameters α

90°

Cell parameters β

118.477(14)°

Cell parameters γ

90°

Z

4

Volumne (ų)

2437.688

Kristall structure

Jakub Plášil, Radek Škoda, Jiří Čejka, Vincent Bourgoin, Jean-Claude Boulliard: Crystal structure of the uranyl-oxide mineral rameauite. Eur J Mineral Vol. 28 No. 5 (2016) S. 959-967.

X-Ray Powder Diffraction

7.12(100),
3.566(90),
3.495(100),
3.473(90),
3.185(90),
3.139(100),
3.124(100)

XRD chart Rameauite

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

Crystals 3D

Open larger view

Physical Properties

Density (g/cm³)

5.467 (berechnet) 5.60 (gemessen)

5.492 ( ρ calc. Mineralienatlas )

Preface

Rareness

selten

Author (Name, Year)

Cesbron & Brown & Bariand & Geffroy, 1972

References

Mineralogical Magazine 38 (1972), 781

Jakub Plášil, Radek Škoda, Jiří Čejka, Vincent Bourgoin, Jean-Claude Boulliard - Crystal structure of the uranyl-oxide mineral rameauite - E. Schweizerbart'sche Verlagsbuchhandlung [Appeared or available online: 14. Juni 2016]

Related minerals "Strunz Classification" (9. Edition) [Mineral | Chemical formula | Crystal system : Class (H-M) : Space Group | Indenture number]

Agrinierite

K2Ca[(UO2)3O3(OH)2]2·5H2O

orthorhombisch : mm2 : F2mm

4.GB.05

Compreignacite

K2(UO2)6O4(OH)6·7H2O

orthorhombisch : mmm : Pnmn

4.GB.05

Rameauite

K2CaU6+6O20·6H2O

monoklin : 2/m : C2/c

4.GB.05

Related minerals "Lapis Classification" [Mineral | Chemical formula | Crystal system : Class (H-M) : Space Group | Indenture number]

Agrinierite

K2Ca[(UO2)3O3(OH)2]2·5H2O

orthorhombisch : mm2 : F2mm

IV/H.02-010

Rameauite

K2CaU6+6O20·6H2O

monoklin : 2/m : C2/c

IV/H.02-020

Related minerals "Hoelzel Classification" [Mineral | Chemical formula : Crystal system : Class (H-M) | Space Group | Indenture number]

Clarkeite

Na(UO2)O(OH)·nH2O

trigonal : 3m : R3m

4.GB.300

Compreignacite

K2(UO2)6O4(OH)6·7H2O

orthorhombisch : mmm : Pnmn

4.GB.320

Agrinierite

K2Ca[(UO2)3O3(OH)2]2·5H2O

orthorhombisch : mm2 : F2mm

4.GB.340

Rameauite

K2CaU6+6O20·6H2O

monoklin : 2/m : C2/c

4.GB.360

Related minerals "Dana 8. Classification" [Mineral | Chemical formula : Crystal system : Class (H-M) | Space Group | Indenture number]

Agrinierite

K2Ca[(UO2)3O3(OH)2]2·5H2O

orthorhombisch : mm2 : F2mm

05.05.01.01

Rameauite

K2CaU6+6O20·6H2O

monoklin : 2/m : C2/c

05.05.02.01

Protasite

Ba(UO2)3O3(OH)2·3H2O

monoklin : m : Pn

05.05.03.01

Other languages

German

Rameauit

English

Rameauite

French

Rameauite

Spanish

Rameauíta

IMA Number

IMA 1971-045

Automatic Links to external internet sources (Responsibility is with the operator)

German pages

DeWikiPedia - search for: Rameauit
Google-Bilder-Suche - search for: Rameauit
Mineralogisch-Petrographisches-Institut Hamburg - search for: Rameauit

English pages

Mindat - search for: Rameauite
Webmineral - search for:Rameauite
Handbook-of-Mineralogy - search for: Rameauite
RRUFF - Raman, XRD and other mineral data - search for: Rameauite
RRUFF - References and PDF downloads - search for: Rameauite
American-Mineralogist-Crystal-Structure-Database - search for: Rameauite
Athena - search for: Rameauite

Mineral Dealer

German pages

hausen - Mineralgroßhandel - search for: Rameauit
Crystal-Treasure.com - search for: Rameauit
Bosse - search for: Rameauit

Locations with GPS information




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