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Niobophyllite

Pictures (3 Images total)

Hydroxycalciopyrochlore, Niobophyllite, Monazite-(Ce)
Views (File:
1476780931
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Hydroxycalciopyrochlore, Niobophyllite, Monazite-(Ce)
SEM image of Nyobophyllite particle from from hand-picked concentrate of Ernst Nickel's part of holotype specimen. Note abundant inclusions of medium-bright in BSE octahedral crystals of Hydroxycalciopyrochlore. More rare brightmost irregular grains are Monazite-(Ce). Analytical data are available on daughter photos. Pavel M. Kartashov collection and photo; Locality: Mann 2, Seal Lake alkaline complex, Labrador, Newfoundland and Labrador, Canada;
Copyright: Pavel M. Kartashov; Contribution: Stefan
Location: Kanada/Neufundland und Labrador/Labrador/Seal Lake/Mann 2 (Ten Mile Lake)
Mineral: Hydroxycalciopyrochlore, Niobophyllite
Image: 1476780931
Rating: 8.5 (votes: 2)
License: Usage for Mineralienatlas project only
Hydroxycalciopyrochlore, Niobophyllite, Monazite-(Ce)

SEM image of Nyobophyllite particle from from hand-picked concentrate of Ernst Nickel's part of holotype specimen. Note abundant inclusions of medium-bright in BSE octahedral crystals of Hydroxycal...

Copyright: Pavel M. Kartashov
Contribution: Stefan 2016-10-18
Locality: Mann 2 (Ten Mile Lake) / Seal Lake / Labrador / Neufundland und Labrador / Kanada
orangebrauner Niobophyllit mit Aegirin und Orthoklas
Views (File:
1143212489
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orangebrauner Niobophyllit mit Aegirin und Orthoklas
Größe: 47x29x18mm; Fundort: Mt. Malosa, Malawi
Copyright: Rob Lavinsky; Contribution: slugslayer
Location: Malawi/Southern Region/Zomba, Distrikt/Mount Malosa
Mineral: Niobophyllite
Image: 1143212489
Rating: 6 (votes: 2)
License: Usage for Mineralienatlas project only
orangebrauner Niobophyllit mit Aegirin und Orthoklas

Größe: 47x29x18mm; Fundort: Mt. Malosa, Malawi

Copyright: Rob Lavinsky
Contribution: slugslayer 2006-03-24
Locality: Mount Malosa / Zomba, Distrikt / Southern Region / Malawi
Niobophyllit xx (braun) auf weißer Pseudomorphose von Churchit-(Y) nach Hingganit-(Y) xx
Views (File:
1478013445
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Niobophyllit xx (braun) auf weißer Pseudomorphose von Churchit-(Y) nach Hingganit-(Y) xx
Mount Malosa,Zomba/Malawi; Größe 2,2 x 2 cm
Copyright: Haubi; Contribution: Haubi
Collection: Haubi
Location: Malawi/Southern Region/Zomba, Distrikt/Mount Malosa
Mineral: Niobophyllite
Image: 1478013445
License: Usage for Mineralienatlas project only
Niobophyllit xx (braun) auf weißer Pseudomorphose von Churchit-(Y) nach Hingganit-(Y) xx

Mount Malosa,Zomba/Malawi; Größe 2,2 x 2 cm

Collection: Haubi
Copyright: Haubi
Contribution: Haubi 2016-11-01
Locality: Mount Malosa / Zomba, Distrikt / Southern Region / Malawi

Collectors Summary

Color schokoladenbraun
Hardness (Mohs) 3-4
Cleavages vollkommen {001}, schlecht {0kl}
Crystal System triklin, P1, P1

Chemism

Chemical formula

K2NaFe2+7(Nb,Ti)2Si8O26(OH)4(F,O)

Chemical composition

Eisen, Natrium, Niob, Silicium, Titan, Fluor, Kalium, Sauerstoff, Wasserstoff

Unit weight: 1382.3435011375 u; Number of atoms in the formula: 55

Info

Empirical formula:

K2NaFe7(Nb0.75Ti0.25)2Si8O26(OH)4(F0.75O0.25)

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)

Hydrogen

H

0.29

4

7.27

1.0079470

4.0317880

Oxygen

O

35.01

30.25

55.00

15.9994300

483.9827575

Fluorine

F

1.03

0.75

1.36

18.9984033

14.2488024

Sodium

Na

1.66

1

1.82

22.9897702

22.9897702

Silicon

Si

16.25

8

14.55

28.0855300

224.6842400

Potassium

K

5.66

2

3.64

39.0983100

78.1966200

Titanium

Ti

1.73

0.5

0.91

47.8671000

23.9335500

Iron

Fe

28.28

7

12.73

55.8452000

390.9164000

Niobium

Nb

10.08

1.5

2.73

92.9063820

139.3595730

Strunz 9th edition incl. updates

9.DC.05

9: Silikate (Germanate)
D: Ketten- und Bandsilikate (Inosilikate)
C: Ketten- und Bandsilikate mit verzweigten 2-periodischen Einzelketten, Si2O6 + 2SiO3 -> Si4O12
05:Astrophyllit-Gruppe

Lapis Classification

VIII/G.12-080

VIII: SILIKATE
G: Übergangsstrukturen zwischen Ketten- und Schichtsilikaten
12: Astrophyllit-Gruppe

Classification by Hölzel

9.DU.560

9: SILICATES
D: Inosilicates; ~[Si2O6]4--...2-Chain
U: Chains to Phyllosilicates
5: Astrophyllite-Group

Dana 8th edition

69.01.01.04

69: Inosilicates Inosilicate Chains with Side Branches or Loops
01: Inosilicates Inosilicate Chains with Side Branches or Loops with (P=2, and N=4, 2 branches)
01: Astrophyllite group

IMA status

Anerkannt von der CNMNC

Mineral status

anerkanntes Mineral

IMA Classification

IMA Classification

Astrophyllite supergroup  ⇒ Astrophyllite group

Optical Properties

Color

schokoladenbraun

Change in color

im Durchlicht bräunlich gelb zu rotorange

Diaphaneity (Transparency)

durchscheinend

max. Birefringence

0.048

Birefringence chart\! Niobophyllite title=Birefringence chart Niobophyllite

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

1.724

RI value β

1.760

RI value γ / ε

1.772

Ri mean

1.752

2V angle

Biaxial (-) 60°

Orientation

Y = a; X ^ b = 13°; Z ⊥ {001}

Pleochroism

stark; X = Y = bräunlich gelb; Z = rot-orange

Crystallography

Crystal System

triklin

Class (H-M)

1, 1

Space Group number

1, 2

Space Group

P1, P1

Cell parameters a (Å)

5.39

Cell parameters b (Å)

11.88

Cell parameters c (Å)

11.66

Cell parameters a/b or c/a

0.454

Cell parameters c/b

0.981

Cell parameters α

113.10

Cell parameters β

94.50

Cell parameters γ

103.10

Z

1

Volume (ų)

657.113

Crystal structure

aufgeklärt, siehe Fernando Cámara, Elena Sokolova, Yassir Abdu und Frank C. Hawthorne: The yrystal structures of NIOBOPHYLLITE, KUPLETSKITE-(Cs) and Sn-rich ASTROPHYLLITE: Revisions to the crystal chemistry of the ASTROPHYLLITE-GROUP minerals. The Canadian Mineralogist 48 (2010) S. 1-16. Erratum dazu: The Canadian Mineralogist 48 (2010) S. 431.

X-Ray Powder Diffraction

10.52(90),
3.741(40),
3.506(100),
3.258(50),
3.019(60),
2.778(80),
2.574(70),
2.475(40)

XRD chart Niobophyllite

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)

3-4

Density (g/cm³)

3.42 (gemessen)

3.493 ( ρ calc. Mineralienatlas )

Cleavages

vollkommen {001}, schlecht {0kl}

(Co-)Type locality

(Co-)Type locality

Kanada/Neufundland und Labrador/Labrador/Seal Lake/Mann 2 (Ten Mile Lake)

Type material

Royal Ontario Museum, Toronto, Kanada

Collection number of type material

M26148

Preface

Name from

Für seinen Niob-Gehalt und dem griechischen Wort Phyllit, was sowviel bedeutet wie Blatt, eine Anspielung auf seine Glimmer-artige Gestalt.

Author (Name, Year)

Nickel & Rowland & Charette, 1964

References

Canadian Mineralogist 41 (2003), 1

The Canadian Mineralogist 48 (2010) S. 431.

IMA group assignments

Other languages

Spanish

Niobofilita

German

Niobophyllit

French

Niobophyllite

English

Niobophyllite

Russian

Ниобофиллит

Alternative Name

Spanish

Niobophyllita

CNMNC (IMA)-Number

IMA 1964-001

CNMNC symbol

Symbol

Nbp

IDs

GUSID (Global unique identifier short form) GokBNaA8lUS763OLrba1tQ
GUID (Global unique identifier) 3501891A-3CA0-4495-BBEB-738BADB6B5B5
Database ID 2763