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Sejkoraite-(Y)

Pictures (2 Images total)

Sejkorait-(Y), Gips
Views (Image: 1444307333): 687
Sejkorait-(Y), Gips

gelbe tafelige Kristalle von Sejkorait-(Y) zusammen mit farblosem Gips-Kristall auf Tennantit-Matrix, Bildbreite: 2,5 mm, Fundort: Werner Mine (Rovnost), St. Joachimsthal (Jáchymov), Region Karlsba...

Copyright: Pavel Škácha, Czechmin
Contribution: thdun5 2015-10-08
Locality: Werner Mine (Rovnost) / St. Joachimsthal (Jáchymov) / Karlsbad (Karlovy Vary), Bezirk / Karlsbad, Region (Karlovarsky kraj) / Tschechien
Sejkorait-(Y) xx mit Gips xx (weiß)
Views (Image: 1562406478): 149
Sejkorait-(Y) xx mit Gips xx (weiß)

Grube Rovnost (vermutlich aus dem Geistergang), Jachymov/Erzgebirge,Böhmen,Tschechien; analysiertes Material von Jakub Plasil; Bildbreite 6,35 mm

Collection: Haubi
Copyright: Haubi
Contribution: Haubi 2019-07-06
Locality: Werner Mine (Rovnost) / St. Joachimsthal (Jáchymov) / Karlsbad (Karlovy Vary), Bezirk / Karlsbad, Region (Karlovarsky kraj) / Tschechien

Collectors Summary

Color gelborange bis orange
Streak color blassgelb bis gelb
Lustre Glasglanz
Hardness (Mohs) 2
Cleavages vollkommen nach {100}
Fracture uneben
Crystal System triklin, P1
Morphology Kristallaggregate, die Kristalle erreichen selten eine Größe von 1 mm

Chemism

Chem­ical formula

Y2(UO2)8O6(SO4)4(OH)2·26H2O

Addi­tional chem. informa­tion

Zippeit Gruppe

Chem­ical com­po­si­tion

Yttrium, Sauerstoff, Schwefel, Uran, Wasserstoff

Unit weight: 3320.696526 u; Number of atoms in the formula: 134

Info

Empirical formula:

Y2(UO2)8O6(SO4)4(OH)2·26H2O

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)

Hydrogen

H

1.64

54

40.30

1.0079470

54.4291380

Oxygen

O

31.80

66

49.25

15.9994300

1,055.9623800

Sulfur

S

3.86

4

2.99

32.0655000

128.2620000

Yttrium

Y

5.35

2

1.49

88.9058520

177.8117040

Uranium

U

57.34

8

5.97

238.0289130

1,904.2313040

Anal­y­sis wt%

SO3 : 9.60, UO3 : 69.06, Y2O3 : 6.77, H2O : 14.58 (Ref: berechnet)

Strunz 9th edi­tion incl. updates

7.EC.15

7: Sulfate (Selenate, Tellurate, Chromate, Molybdate, Wolframate)
E: Uranylsulfate
C: Mit mittelgroßen und großen [Kationen]
15:

Lapis Clas­sifica­tion

VI/D.20-085

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

Clas­sifica­tion by Hölzel

7.ED.320

7: SULFATES CHROMATES MOLYBDATES WOLFRAMATES
E: Uranyl-Sulfates
D: Uranyl-Sulfates (+Anions +Water)

IMA sta­tus

anerkannt, Neue Mineralien - IMA WEB Seite, Mai 2008

Min­eral sta­tus

anerkanntes Mineral

IMA Classification

IMA Clas­sifica­tion

Zippeite group

Optical Properties

Color

gelborange bis orange

Streak color

blassgelb bis gelb

Lus­tre

Glasglanz

max. Birefrin­gence

0.110

Birefringence chart\! Sejkoraite-(Y) title=Birefringence chart Sejkoraite-(Y)

Michel-Levy Color Chart viewed according to the maximum birefringence (at 30μm). Mineral color is not taken into account. Click on the image to enlarge or change thickness.

RI value α / ω / n

1.620

RI value β

1.662

RI value γ / ε

1.730

Ri mean

1.671

2V angle

Biaxial (-) 79°

Pleochro­ism

"with no visible pleochroism"

Optical Data Luminescence

Lumi­nes­cence

keine Fluoreszenz unter UV 254 und UV 360

Crystallography

Crystal Sys­tem

triklin

Class (H-M)

1

Space Group number

1

Space Group

P1

Cell param­e­ters a (Å)

13.949

Cell param­e­ters b (Å)

14.329

Cell param­e­ters c (Å)

15.104

Cell param­e­ters a/b or c/a

0.973

Cell param­e­ters c/b

1.054

Cell param­e­ters α

107.43

Cell param­e­ters β

95.75

Cell param­e­ters γ

102.52

Z

2

Volumne (ų)

2767.265

Kristall struc­ture

aufgeklärt, siehe Jakub Plášil, Michal Dušek, Milan Novák, Jirí Cejka, Ivana Císarová, Radek Skoda: Sejkoraite-(Y), a new member of the zippeite group containing trivalent cations from Jáchymov (St. Joachimsthal), Czech Republic: Description and crystal structure refinement. American Mineralogist 96 (2011) S.983-991.

X-Ray Pow­der Diffrac­tion

14.12(5), 9.28(100), 4.64(41), 3.451(8), 3.385(7), 3.293(13), 3.094(8), 3.059(7)

XRD chart Sejkoraite-(Y)

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

Morphol­ogy

Kristallaggregate, die Kristalle erreichen selten eine Größe von 1 mm

Crystal Structure 3D

Open larger view

Physical Properties

Hard­ness (Mohs)

2

Density (g/cm³)

4.04

3.985 ( ρ calc. Mineralienatlas )

Cleav­ages

vollkommen nach {100}

Frac­ture

uneben

Tenac­ity

spröde

Chem­ical Prop­er­ties and Tests

Raman-Spektrum und IR-Spektrum sind beschrieben, siehe
Jakub Plášil, Michal Dušek, Milan Novák, Jirí Cejka, Ivana Císarová, Radek Skoda: Sejkoraite-(Y), a new member of the zippeite group containing trivalent cations from Jáchymov (St. Joachimsthal), Czech Republic: Description and crystal structure refinement. American Mineralogist 96 (2011) S.983-991.

(Co-)Type locality

(Co-)Type locality

Tschechien/Karlsbad, Region (Karlovarsky kraj)/Karlsbad (Karlovy Vary), Bezirk/St. Joachimsthal (Jáchymov)/Werner Mine (Rovnost)/Roter Gang (Červená)

Par­a­ge­n­e­sis of type mate­r­ial

auf umgewandelten, primären Mineralen Uraninit, Chalkopyrit, Tennantit, neben Pseudojohannit, Rabejacit, Uranopilit, Zippeit, Gips.

Preface

Name from

Jirí Sejkora, Mineraloge am Nationalmuseum in Prag.

Author (Name, Year)

Jakub Plášil et al., 2011

References

Jakub Plášil, Michal Dušek, Milan Novák, Jirí Čejka, Ivana Císarová, Radek Skoda: Sejkoraite-(Y), a new member of the zippeite group containing trivalent cations from Jáchymov (St. Joachimsthal), Czech Republic: Description and crystal structure refinement. American Mineralogist 96 (2011) S.983-991.

Neue Mineralien - IMA WEB Seite, Mai 2008

IMA group assignments

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

Sejkoraite-(Y)

Y2(UO2)8O6(SO4)4(OH)2·26H2O

triklin : 1 : P1

7.EC.15

Marécottite

Mg3[(UO2)4O3(OH)(SO4)2]2(H2O)28

triklin : 1 : P1

7.EC.15

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

Jáchymovite

(UO2)8(OH)14(SO4)·13H2O

monoklin : 2, 2/m : P21, P21/m

VI/D.20-005

Uranopilite

(UO2)6SO4O2(OH)6·14H2O

triklin : 1 : P1

VI/D.20-010

Metauranopilite

(UO2)6SO4(OH)10·5H2O

VI/D.20-020

Mathesiusite

K5(UO2)4(SO4)4(VO5)·4H2O

tetragonal : 4/m : P4/n

VI/D.20-024

Adolfpateraite

K(UO2)(SO4)(OH)(H2O)

monoklin : 2/m : P21/c

VI/D.20-025

Natrozippeite

Na5(UO2)8(SO4)4O5(OH)3·12H2O

monoklin : 2/m : P21/n

VI/D.20-030

Zippeite

K3(UO2)4(SO4)2O3(OH)·3H2O

monoklin : 2 : C2

VI/D.20-040

Nickelzippeite

Ni2(UO2)6(SO4)3(OH)10·16H2O

monoklin : 2/m : C2/m

VI/D.20-050

Cobaltzippeite

Co(UO2)2(SO4)O2·3.5H2O

monoklin : 2/m : C2/m

VI/D.20-060

Zinczippeite

Zn(UO2)2(SO4)O2·3.5H2O

monoklin : 2/m : C2/m

VI/D.20-070

Magnesiozippeite

Mg(UO2)2(SO4)O2·3.5H2O

monoklin : 2/m : C2/m

VI/D.20-075

Marécottite

Mg3[(UO2)4O3(OH)(SO4)2]2(H2O)28

triklin : 1 : P1

VI/D.20-080

Sejkoraite-(Y)

Y2(UO2)8O6(SO4)4(OH)2·26H2O

triklin : 1 : P1

VI/D.20-085

Rabejacite

Ca2[(UO2)4O4(SO4)2](H2O)8

triklin : 1 : P1

VI/D.20-090

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

Natrozippeite

Na5(UO2)8(SO4)4O5(OH)3·12H2O

monoklin : 2/m : P21/n

7.ED.300

Zippeite

K3(UO2)4(SO4)2O3(OH)·3H2O

monoklin : 2 : C2

7.ED.310

Sejkoraite-(Y)

Y2(UO2)8O6(SO4)4(OH)2·26H2O

triklin : 1 : P1

7.ED.320

Rabejacite

Ca2[(UO2)4O4(SO4)2](H2O)8

triklin : 1 : P1

7.ED.330

Adolfpateraite

K(UO2)(SO4)(OH)(H2O)

monoklin : 2/m : P21/c

7.ED.350

Other languages

German

Sejkorait-(Y)

English

Sejkoraite-(Y)

IMA Number

IMA 2009-008

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

German pages

DeWikiPedia - search for: Sejkorait-(Y)
Google-Bilder-Suche - search for: Sejkorait-(Y)
Mineralogisch-Petrographisches-Institut Hamburg - search for: Sejkorait-(Y)

English pages

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

Mineral Dealer

German pages

hausen - Mineralgroßhandel - search for: Sejkorait-(Y)
Crystal-Treasure.com - search for: Sejkorait-(Y)
Bosse - search for: Sejkorait-(Y)

Locations with GPS information