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Tveitite-(Y)

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Tveitit-(Y)
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Tveitit-(Y)

beige massen von Tveitit-(Y), Keivy Mountains, Kola, Russland; BB 3 cm, analysiert

Copyright: MinTreasure.com (Carsten Slotta)
Contribution: openpit 2020-02-08
Locality: Keivy-Massiv / Kola-Halbinsel / Murmansk, Oblast / Nordwestrussland, Föderationskreis / Russland

Collectors Summary

Color weiß, hellgelb
Streak color weiß
Lustre Fettglanz
Hardness (Mohs) 3.75
Crystal System trigonal, R3

Chemism

Chem­ical formula

(Y,Na)6(Ca,Na,REE)12(Ca,Na)F42

Chem­ical com­po­si­tion

Calcium, Natrium, Yttrium, Fluor, REE

Unit weight: 1812.42782107 u; Number of atoms in the formula: 61

Info

Empirical formula:

(Y0.75Na0.25)6(Ca0.6Na0.3REE0.1)12(Ca0.75Na0.25)F42

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)

Fluorine

F

44.03

42

68.85

18.9984033

797.9329365

Sodium

Na

6.79

5.35

8.77

22.9897702

122.9952706

Calcium

Ca

17.58

7.95

13.03

40.0784000

318.6232800

Yttrium

Y

22.07

4.5

7.38

88.9058520

400.0763340

Rare Earth

REE

9.53

1.2

1.97

144.0000000

172.8000000

Strunz 9th edi­tion incl. updates

3.AB.30

3: Halide (Fluoride, Chloride, Bromide, Iodide)
A: Einfache Halogenide ohne H2O
B: M:X = 1:2
30:Tveitit

Lapis Clas­sifica­tion

III/A.08-030

III: HALOGENIDE (Fluoride, Chloride, Bromide, Jodide)
A: Einfache Halogenide
8: Wasserfrei, Metall : Halogen = 1:2, 1:3

Clas­sifica­tion by Hölzel

3.DA.300

3: HALIDES
D: Complex Halides
A: Without H2O and without Al

Dana 8th edi­tion

09.02.01.03

09: Halide Minerals
02: Anhydrous and Hydrated Halides where A (X)2
01: Fluorite Group

IMA sta­tus

Anerkannt von der CNMNC

Min­eral sta­tus

anerkanntes Mineral

Optical Properties

Color

weiß, hellgelb

Streak color

weiß

Diaphane­ity (Trans­parency)

transparent

Lus­tre

Fettglanz

max. Birefrin­gence

0.005

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

1.476

RI value β

1.479

RI value γ / ε

1.481

Ri mean

1.479

2V angle

Biaxial (-) 34°

Optical Data Luminescence

Lumi­nes­cence

fluoreszierend, Kurzwelliges UV=matt gelb orange

Color SW-UV (254nm)

 

orangegelb

SW-UV Intensity

stark

SW-UV Other Col­ors

 

gelblich weiß

After­glow (Per­sistant Lumi­nes­cence)

keine Daten

Crystallography

Crystal Sys­tem

trigonal

Class (H-M)

3

Space Group number

148

Space Group

R3

Cell param­e­ters a (Å)

16.9620

Cell param­e­ters b (Å)

-

Cell param­e­ters c (Å)

9.666

Cell param­e­ters a/b or c/a

0.57

Cell param­e­ters c/b

-

Z

3

Volumne (ų)

2408.416

X-Ray Pow­der Diffrac­tion

3.222(40),
3.184(100),
2.764(50),
1.963(50),
1.949(70),
1.676(40),
1.664(60),
1.265(80)

XRD chart Tveitite-(Y)

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

Crystal Structure 3D

Open larger view

Physical Properties

Hard­ness (Mohs)

3.75

VHN (Hard­ness Vick­ers)

160 (ungefähre Angabe abgeleitet aus der Mohshärte)

Density (g/cm³)

3.94 (gemessen)

3.749 ( ρ calc. Mineralienatlas )

(Co-)Type locality

(Co-)Type locality

Norwegen/Vestfold og Telemark, Provinz/Drangedal/Tørdal/Høydalen

Type mate­r­ial

Mineralogical-Geological Museum, University of Oslo, Oslo, Norwegen

National Museum of Natural History, Washington, D.C., USA

Col­lec­tion number of type mate­r­ial

137096 (USA)

Preface

Name from

John Tveit, in dessen Steinbruch in Norwegen das Mineral zum ersten mal gefunden wurde

Author (Name, Year)

Bergstøl & Jensen & Neumann, 1977

References

Lithos 10 (1977), 81

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

Tveitite-(Y)

(Y,Na)6(Ca,Na,REE)12(Ca,Na)F42

trigonal : 3 : R3

3.AB.30

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

Fluorite

CaF2

kubisch : m3m : Fm3m

III/A.08-010

Strontiofluorite

SrF2

kubisch : m3m : Fm3m

III/A.08-015

Frankdicksonite

BaF2

kubisch : m3m : Fm3m

III/A.08-020

Fluorocronite

PbF2

kubisch : m3m : Fm3m

III/A.08-022

Håleniusite-(La)

(La,Ce)OF

kubisch : m3m : Fm3m

III/A.08-025

Tveitite-(Y)

(Y,Na)6(Ca,Na,REE)12(Ca,Na)F42

trigonal : 3 : R3

III/A.08-030

Gagarinite-(Y)

NaCaY(F,Cl)6

hexagonal : 6/m : P63/m

III/A.08-040

Gagarinite-(Ce)

NaCaCeF6

trigonal : 3 : P3

III/A.08-045

Polezhaevaite-(Ce)

NaSrCeF6

hexagonal : 6/m : P63/m

III/A.08-047

Laurelite

Pb7F12Cl2

hexagonal : 3m : P6

III/A.08-050

Coccinite

Hg2+I2

tetragonal : 4/mmm : P42/nmc

III/A.08-060

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

Tveitite-(Y)

(Y,Na)6(Ca,Na,REE)12(Ca,Na)F42

trigonal : 3 : R3

3.DA.300

Gagarinite-(Y)

NaCaY(F,Cl)6

hexagonal : 6/m : P63/m

3.DA.340

Polezhaevaite-(Ce)

NaSrCeF6

hexagonal : 6/m : P63/m

3.DA.345

'Kostinite'

Na0.83(Y,Na,Ca,Er,Dy,Yb)2F6

hexagonal : 6/m : P63/m

3.DA.350

Gagarinite-(Ce)

NaCaCeF6

trigonal : 3 : P3

3.DA.360

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

Fluorite

CaF2

kubisch : m3m : Fm3m

09.02.01.01

Frankdicksonite

BaF2

kubisch : m3m : Fm3m

09.02.01.02

Tveitite-(Y)

(Y,Na)6(Ca,Na,REE)12(Ca,Na)F42

trigonal : 3 : R3

09.02.01.03

Sellaite

MgF2

tetragonal : 4/mmm : P42/mnm

09.02.02.01

Lawrencite

(Fe2+,Ni)Cl2

trigonal : 3m : R3m

09.02.03.01

Scacchite

MnCl2

trigonal : 3m : R3m

09.02.03.02

Rokühnite

Fe2+Cl2·H2O

monoklin : 2/m : C2/m

09.02.04.01

Sinjarite

CaCl2·2H2O

09.02.05.01

Antarcticite

CaCl2·6H2O

trigonal : 32 : P321

09.02.06.01

Cotunnite

PbCl2

orthorhombisch : mmm : Pnam

09.02.07.01

'Hydrophilite'

CaCl2 (?)

orthorhombisch : mmm : Pnnm

09.02.07.02

Eriochalcite

CuCl2·2H2O

orthorhombisch : mmm : Pbmn

09.02.08.01

Tolbachite

CuCl2

monoklin : 2/m : C2/m

09.02.08.02

Bischofite

MgCl2·6 H2O

monoklin : 2/m : C2/m

09.02.09.01

Nickelbischofite

NiCl2·6H2O

monoklin : 2/m : C2/m

09.02.09.02

Other languages

German

Tveitit-(Y)

Spanish

Tveitita-(Y)

English

Tveitite-(Y)

French

Tveitite-(Y)

Russian

Твейтит-(Y)

CNMNC (IMA)-Number

IMA 1975-033

CNMNC symbol

Symbol

Ttt-Y

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

German pages

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

English pages

Mindat - search for: Tveitite-(Y)
Webmineral - search for:Tveitite-(Y)
Handbook-of-Mineralogy - search for: Tveitite-(Y)
RRUFF - Raman, XRD and other mineral data - search for: Tveitite-(Y)
RRUFF - References and PDF downloads - search for: Tveitite-(Y)
American-Mineralogist-Crystal-Structure-Database - search for: Tveitite-(Y)
Athena - search for: Tveitite-(Y)
Strahlen.org - search for: Tveitite-(Y)
Mineralienatls.de (Forum) - search for: Tveitit-(Y)

Russian pages

Webmineral.ru - search for: Твейтит-(Y)

Mineral Dealer

German pages

hausen - Mineralgroßhandel - search for: Tveitit-(Y)
Crystal-Treasure.com - search for: Tveitit-(Y)
Bosse - search for: Tveitit-(Y)
Edelsteine Neuburg - Gundolf Fischer - search for: Tveitit-(Y)