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Parakeldyshite

Pictures (3 Images total)

Parakeldyshit
Views (File:
1580748710
): 286
Parakeldyshit
weiße Kristalle von Parakeldyshit in rotbraunem Eudialyt, Alluaiv, Lovozero, Kola, Russland; BB ~ 2 cm, analysiert
Copyright: MinTreasure.com (Carsten Slotta); Contribution: openpit
Location: Russland/Nordwestrussland, Föderationskreis/Murmansk, Oblast/Kola-Halbinsel/Lovozero/Alluaiv
Mineral: Parakeldyshite
Image: 1580748710
License: Usage for Mineralienatlas project only
Parakeldyshit

weiße Kristalle von Parakeldyshit in rotbraunem Eudialyt, Alluaiv, Lovozero, Kola, Russland; BB 2 cm, analysiert
Copyright: MinTreasure.com (Carsten Slotta)
Contribution: openpit 2020-02-03
Locality: Alluaiv / Lovozero / Kola-Halbinsel / Murmansk, Oblast / Nordwestrussland, Föderationskreis / Russland
Parakeldyshit
Views (File:
1701541340
): 27
Parakeldyshit
Weiße eingewachsene Parakeldyshit-xx (ohne Maßstab); FO: Bratthagen Quarries, Lågendalen, Hedrum, Larvik, Vestfold, Norwegen.
Copyright: Wikipedia-user: David Hospital; Contribution: oliverOliver
Location: Norwegen/Vestfold, Provinz/Larvik, Kommune/Hedrum/Lagendalen/Bratthagen
Mineral: Parakeldyshite
Image: 1701541340
License: Creative Commons - Attribution-ShareAlike 4.0 International  (CC BY-SA) V.4.0
Parakeldyshit

Weiße eingewachsene Parakeldyshit-xx (ohne Maßstab); FO: Bratthagen Quarries, Lågendalen, Hedrum, Larvik, Vestfold, Norwegen.
Copyright: Wikipedia-user: David Hospital
Contribution: oliverOliver 2023-12-02
Locality: Bratthagen / Lagendalen / Hedrum / Larvik, Kommune / Vestfold, Provinz / Norwegen
Keldyshit
Views (File:
1721063223
): 10
Keldyshit
Etwa 63 mm x 60 mm große Stufe mit weißem Keldyshit in Verwachsung mit Parakeldyshit (?) von Bratthagen in Norwegen.
Copyright: Klaus Schäfer; Contribution: Klaus Schäfer
Collection: Klaus Schäfer, Collection number: SyS-Keld-5-1-1
Location: Norwegen/Vestfold, Provinz/Larvik, Kommune/Hedrum/Lagendalen/Bratthagen/Bratthagen 1
Mineral: Keldyshite, Parakeldyshite
Image: 1721063223
License: Usage for Mineralienatlas project only
Keldyshit (SNr: SyS-Keld-5-1-1)

Etwa 63 mm x 60 mm große Stufe mit weißem Keldyshit in Verwachsung mit Parakeldyshit (?) von Bratthagen in Norwegen.
Collection: Klaus Schäfer
Copyright: Klaus Schäfer
Contribution: Klaus Schäfer 2024-07-15
Locality: Bratthagen 1 / Bratthagen / Lagendalen / Hedrum / Larvik, Kommune / Vestfold, Provinz / Norwegen

Collectors Summary

Color bläulichweiß, weiß
Streak color weiß
Hardness (Mohs) 5.75
Crystal System triklin, P1

Chemism

Chemical formula

Na2ZrSi2O7

Chemical composition

Natrium, Silicium, Zirconium, Sauerstoff

Unit weight: 305.3708104 u; Number of atoms in the formula: 12

Info

Empirical formula:

Na2ZrSi2O7

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)
Oxygen

O

36.68

7

58.33

15.9994300

111.9960100
Sodium

Na

15.06

2

16.67

22.9897702

45.9795404
Silicon

Si

18.39

2

16.67

28.0855300

56.1710600
Zirconium

Zr

29.87

1

8.33

91.2242000

91.2242000

Analysis wt%

SiO2 : 39.22, ZrO2 : 40.07, Na2O : 19.33, H2O : 0.48 (Ref: Canadian Mineralogist 77)

Strunz 9th edition incl. updates

9.BC.10

9: Silikate (Germanate)
B: Gruppensilikate (Sorosilikate)
C: Si2O7 Gruppen, ohne nicht-tetrahedrale Anionen; Kationen in oktahedraler [6] und/oder anderer Koordination
10:Keldyshit-Gruppe

Lapis Classification

VIII/C.04-020

VIII: SILIKATE
C: Gruppensilikate
4: Gruppensilikate [Si2O7] 6-, ohne tetraederfremde Anionen

Classification by Hölzel

9.BB.610

9: SILICATES
B: Sorosilicates
B: Melilite-Group

Dana 8th edition

55.02.02.03

55: Sorosilicate Minerals
02: Sorosilicates Sorosilicate Si2O7 Groups, Generally with No Additional Anions with cations in [6] coordination
02: Keldyshite group

IMA status

Anerkannt von der CNMNC

Mineral status

anerkanntes Mineral

Optical Properties

Color

bläulichweiß, weiß

Streak color

weiß

Diaphaneity (Transparency)

durchscheinend

max. Birefringence

0.043
Birefringence chart\! Parakeldyshite title=Birefringence chart Parakeldyshite

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

1.670

RI value β

1.692

RI value γ / ε

1.713

Ri mean

1.692

2V angle

Biaxial (-) 84°

Optical Data Luminescence

Luminescence

fluoreszierend

Color LW-UV (365nm)

  

orangegelb

LW-UV Intensity

stark

Color SW-UV (254nm)

  

weiß

SW-UV Intensity

stark

LW-UV Other Colors

  

gelblich weiß

SW-UV Other Colors

    

rosa, blau

Most Common Activator

n[TiO6]-Gruppe

Afterglow (Persistant Luminescence)

keine Daten

Crystallography

Crystal System

triklin

Class (H-M)

1

Space Group number

2

Space Group

P1

Cell parameters a (Å)

5.418

Cell parameters b (Å)

6.607

Cell parameters c (Å)

8.806

Cell parameters a/b or c/a

0.820

Cell parameters c/b

1.333

Cell parameters α

71.50

Cell parameters β

87.15

Cell parameters γ

85.63

Z

2

Volume (ų)

297.958

X-Ray Powder Diffraction

6.019(30),
4.229(50),
4.184(90),
3.980(100),
2.910(100),
2.710(60),
2.678(40),
2.653(90)
XRD chart Parakeldyshite

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

Crystals 3D

Open larger view

Crystal Structure 3D

Open larger view

Physical Properties

Hardness (Mohs)

5.75

VHN (Hardness Vickers)

630 (ungefähre Angabe abgeleitet aus der Mohshärte)

Density (g/cm³)

3.39

3.403 ( ρ calc. Mineralienatlas )

(Co-)Type locality

(Co-)Type locality

Russland/Nordwestrussland, Föderationskreis/Murmansk, Oblast/Kola-Halbinsel/Lovozero/Alluaiv

Russland/Nordwestrussland, Föderationskreis/Murmansk, Oblast/Kola-Halbinsel/Chibiny (Khibiny)/Takhtarvumchorr/Molybdän Mine

Preface

Author (Name, Year)

Khomyakov & Voronkov & Kazakova & Vlasova & Smolyaninova, 1975

References

Trudy Mineralogicheskogo Muzeya Akademiya Nauk SSSR 24 (1975), 120

Other languages

German

Parakeldyshit

Spanish

Parakeldyshita

English

Parakeldyshite

French

Parakeldyshite

Russian

Паракелдышит

CNMNC (IMA)-Number

IMA 1975-035

CNMNC symbol

Symbol

Pkel

Locations with GPS information

IDs

GUSID (Global unique identifier short form) sTmTwRXpekKMGIL8y5-Olg
GUID (Global unique identifier) C19339B1-E915-427A-8C18-82FCCB9F8E96
Database ID 2921