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Arapovite (Arapovit)

Collectors Summary

Color dunkelgrün
Streak color weiß
Lustre Glasglanz
Hardness (Mohs) 5.75
Cleavages keine
Fracture muschelig
Crystal System tetragonal, P4/mcc
Morphology Arapovit wurde bisher nicht in Form eigenständiger Kristalle gefunden, sondern nur als 0,1 bis

Chemism

Chemical formula

(U,Th)(Ca,Na)2(K1-x☐x)Si8O20·H2O

Additional chem. information

Steacyit Gruppe

Chemical composition

Calcium, Natrium, Silicium, Thorium, Kalium, Sauerstoff, Uran, Wasserstoff, Vakanz

Analysis wt%

Ø SiO2 : 53.99, UO2 : 16.63, ThO2 : 10.57, Ce2O3 : 0.55, Nd2O3 : 0.62, PbO : 0.82, CaO : 8.11, Na2O : 2.54, K2O : 4.52, H2O : 1.80 (Ref: New Data on Minerals, (Monatshefte) 2004)

Strunz 9th edition incl. updates

9.CH.10

9: Silikate (Germanate)
C: Ringsilikate (Cyclosilikate)
H: ~[Si4O12]9- vierer-Doppelringe
10:Steacyit-Gruppe

Lapis Classification

VIII/E.10-050

VIII: SILIKATE
E: Ringsilikate
10: Doppelte Viererringe [Si8O20] 8-

Classification by Hölzel

9.CB.840

9: SILICATES
C: Cyclosilicates
B: ~[Si4O12]8-, ~[Si4O10]4--Rings
8: Ekanite-Group

Dana 8th edition

63.01.01.04

63: Cyclosilicates Cyclosilicate Condensed Rings
01: Cyclosilicates Cyclosilicate Condensed Rings 4-membered rings
01: Steacyite Group

IMA status

anerkannt 2003

Mineral status

anerkanntes Mineral

Optical Properties

Color

dunkelgrün

Streak color

weiß

Diaphaneity (Transparency)

transparent

Lustre

Glasglanz

max. Birefringence

0.005
Birefringence chart\! Arapovite title=Birefringence chart Arapovite

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

1.615

RI value γ / ε

1.610

Ri mean

1.613

2V angle

Uniaxial (-)

Optical Data Luminescence

Luminescence

keine Fluoreszenz bekannt

Crystallography

Crystal System

tetragonal

Class (H-M)

4/mmm

Space Group number

124

Space Group

P4/mcc

Cell parameters a (Å)

7.551

Cell parameters b (Å)

-

Cell parameters c (Å)

14.710

Cell parameters a/b or c/a

1.948

Cell parameters c/b

-

Cell parameters α

90°

Cell parameters β

90°

Cell parameters γ

90°

Z

2

Volumne (ų)

838.729

X-Ray Powder Diffraction

5.34(23), 5.28(38), 3.37(100), 3.31(59), 2.640(64), 2.515(21), 2.161(45), 2.016(29), 1.644(30)
XRD chart Arapovite

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

Morphology

Arapovit wurde bisher nicht in Form eigenständiger Kristalle gefunden, sondern nur als 0,1 bis

Crystal Structure 3D

Open larger view

Physical Properties

Hardness (Mohs)

5.75

VHN (Hardness Vickers)

707 (100g)

Density (g/cm³)

3.365 g/cm3 (berechnet)

Cleavages

keine

Fracture

muschelig

(Co-)Type locality

(Co-)Type locality

Tadschikistan/Republik-unterstellte Gebiete (Nohijahoi tobei Dschumhurij)/Dara-i-Pioz (Darai-Pioz)

Preface

Associations

Mikroklin, Stillwellit-(Ce), Turkestanit

Author (Name, Year)

Agakhanov & Pautov & Uvarova & Sokolova & Hawthorne & Karpenko & Dusma

Additional Information

Der Name wurde zu Ehren von Yuri, A. A RAPOV (1907–1988) vergeben, der als Geologe und Geochemiker im Pamir arbeitete.

References

Y. UVAROVA , E. SOKOLOVA , F. HAWTHORNE, A. AGAKHANOV, L. P AUTOV, (2004): The crystal structure of rapovite, U4+(Ca,Na)2(K1-x?x)[(Si4O10)2]•H2O; x ca. 0,5, a new mineral species of the steacyte group from the Dara-I-Poiz moraine, Tien-Shan Montains, Tadjikistan – Can. Min. 41, 125–134|1005–1011 (2004) - New Data on Minerals 39, 14–19.

Other languages

German

Arapovit

Spanish

Arapovita

French

Arapovite

English

Arapovite

Russian

Араповит

Simplified Chinese

阿渃波夫石

CNMNC (IMA)-Number

IMA 2003-046

CNMNC symbol

Symbol

Apv

Locations with GPS information