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Tveitite-(Y)

Pictures (1 Images total)

Tveitit-(Y)
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1581182335
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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
Location: Russland/Nordwestrussland, Föderationskreis/Murmansk, Oblast/Kola-Halbinsel/Keivy-Massiv
Mineral: Tveitite-(Y)
Image: 1581182335
License: Usage for Mineralienatlas project only
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

Volume (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/Telemark, Provinz/Drangedal, Kommune/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

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

IDs

GUSID (Global unique identifier short form) DBbTw2uwrEGYF8JCO848RQ
GUID (Global unique identifier) C3D3160C-B06B-41AC-9817-C2423BCE3C45
Database ID 3958