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Eylettersite

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Eylettersit
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Eylettersit
weiße Aggregate von Eylettersit, Kobokobo-Pegmatit, Süd-Kivu, DR Kongo; BB ~ 5 mm
Copyright: Joy Desor; Contribution: openpit
Location: Demokratische Republik Kongo/Süd-Kivu, Provinz/Kobokobo-Pegmatit
Mineral: Eylettersite
Image: 1586624568
License: Usage for Mineralienatlas project only
Eylettersit

weiße Aggregate von Eylettersit, Kobokobo-Pegmatit, Süd-Kivu, DR Kongo; BB 5 mm
Copyright: Joy Desor
Contribution: openpit 2020-04-11
Locality: Kobokobo-Pegmatit / Süd-Kivu, Provinz / Demokratische Republik Kongo

Collectors Summary

Color cremeweiß
Streak color weiß
Solubility +++ H2SO4
Crystal System trigonal, R3m

Chemism

Chemical formula

(Th,Pb)1-xAl3(PO4,SiO4)2(OH)6

Chemical composition

Aluminium, Blei, Silicium, Thorium, Phosphor, Sauerstoff, Wasserstoff

Analysis wt%

Ø P2O5 : 19.01, ThO2 : 19.27, UO3 : 3.07, CaO : 0.64, BaO : 1.68, PbO : 3.86, Al2O3 : 35.30, ZrO2 : 0.97, SiO2 : 1.43, H2O : 14.70 (Ref: Bulletin de Mineralogie 72)

Strunz 9th edition incl. updates

8.BL.13

8: Phosphate, Arsenate, Vanadate
B: Phosphate, etc., mit weitere Anionen, ohne H2O
L: Mit mittelgroßen und großen [Kationen] (OH, etc.):RO4 = 3:1
13:

Lapis Classification

VII/B.36-100

VII: PHOSPHATE, ARSENATE UND VANADATE ("Phosphate" des Registers immer einschließlich isotyper Arsenate und Vanadate!)
B: Wasserfreie Phosphate, mit fremden Anionen F,Cl,O,OH
36: Mittelgroße und große Kationen: Mg-Cu-Zn und Ca-Na-K-Ba-Pb; Crandallit-Gruppe

Classification by Hölzel

8.BK.450

8: PHOSPHATES ARSENATES VANADATES
B: Phosphates (+Anions -Water)
K: Phosphatian (+AsO4) Alunites, trigonal, very large: 1,2,3,4, Vmed: 3
4: With Bi,Th Waylandite-Group

Dana 8th edition

41.05.12.02

41: Anhydrous Phosphates, etc. Containing Hydroxyl or Halogen
05: Anhydrous Phosphates, etc. Containing Hydroxyl or Halogen where (A B)2 (XO4) Zq
12: Waylandite Group

IMA status

Anerkannt von der CNMNC

Mineral status

anerkanntes Mineral

IMA Classification

IMA Classification

 Alunite supergroup  ⇒ Plumbogummite group with -1c

Optical Properties

Color

cremeweiß

Streak color

weiß

Diaphaneity (Transparency)

transparent bis durchscheinend

max. Birefringence

nicht wahrnehmbar

RI value α / ω / n

1.61

RI value γ / ε

1.66

Optical Data Luminescence

Luminescence

fluoreszierend; Kurzwelliges UV=grünlich gelb, Langwelliges UV=schwach cremfarben brown

Color LW-UV (365nm)

  

gelblich weiß

Color SW-UV (254nm)

  

grünlich gelb

Afterglow (Persistant Luminescence)

keine Daten

Crystallography

Crystal System

trigonal

Class (H-M)

3m

Space Group number

166

Space Group

R3m

Cell parameters a (Å)

6.99

Cell parameters b (Å)

-

Cell parameters c (Å)

16.68

Cell parameters a/b or c/a

2.386

Cell parameters c/b

-

Z

3

Volume (ų)

705.799

X-Ray Powder Diffraction

5.70(50),
3.51(60),
2.95(100),
2.848(10),
2.269(10),
2.187(40),
1.899(30),
1.478(20)
XRD chart Eylettersite

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

Physical Properties

Density (g/cm³)

3.38 - 3.44 / Durchschnittlich = 3.41

Radioactivity

radioaktiv

Instability

+++ H2SO4

(Co-)Type locality

(Co-)Type locality

Demokratische Republik Kongo/Süd-Kivu, Provinz/Kobokobo-Pegmatit

Preface

Author (Name, Year)

Van Wambeke, 1972

Safety Instructions

Industrial chemicals are often present in powder form and therefore often contain much higher dangers than natural, crystalline substances. These hazard statements refer to the classification of industrially used chemical compounds that may also occur in this natural mineral. The hazard classification makes no claim to completeness.




Safety classes: Ionizing radiation: Radioaktiv

References

Bulletin de la Société Française Minéralogie et de Cristallographie 95 (1972), 98

IMA group assignments

Other languages

German

Eylettersit

Spanish

Eylettersita

English

Eylettersite

French

Eylettersite

Russian

Эйлеттерсит

CNMNC (IMA)-Number

IMA 1969-035

CNMNC symbol

Symbol

Eyl

Locations with GPS information

IDs

GUSID (Global unique identifier short form) 5uN_6titukmF2QIlfxohMA
GUID (Global unique identifier) EA7FE3E6-ADD8-49BA-85D9-02257F1A2130
Database ID 1083