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Simpsonite

Pictures (2 Images total)

Simpsonit
Views (File:
1259467057
): 1107
Simpsonit
Größe: 13x12x08 mm; Fundort: Alto-do-Giz-Pegmatit, Equador, Nordostregion, Brasilien
Copyright: Rob Lavinsky; Contribution: Philip Blümner
Location: Brasilien/Nordosten (Região Nordeste)/Rio Grande do Norte/Borborema, Bergbaudistrikt/Equador/Alto-do-Giz-Pegmatit
Mineral: Simpsonite
Image: 1259467057
License: Usage for Mineralienatlas project only
Simpsonit

Größe: 13x12x08 mm; Fundort: Alto-do-Giz-Pegmatit, Equador, Nordostregion, Brasilien
Copyright: Rob Lavinsky
Contribution: Philip Blümner 2009-11-29
Locality: Alto-do-Giz-Pegmatit / Equador / Borborema, Bergbaudistrikt / Rio Grande do Norte / Nordosten (Região Nordeste) / Brasilien
Simpsonit
Views (File:
1259467109
): 1441
Simpsonit
Größe: 16x15x08 mm; Fundort: Alto-do-Giz-Pegmatit, Equador, Nordostregion, Brasilien
Copyright: Rob Lavinsky; Contribution: Philip Blümner
Location: Brasilien/Nordosten (Região Nordeste)/Rio Grande do Norte/Borborema, Bergbaudistrikt/Equador/Alto-do-Giz-Pegmatit
Mineral: Simpsonite
Image: 1259467109
License: Usage for Mineralienatlas project only
Simpsonit

Größe: 16x15x08 mm; Fundort: Alto-do-Giz-Pegmatit, Equador, Nordostregion, Brasilien
Copyright: Rob Lavinsky
Contribution: Philip Blümner 2009-11-29
Locality: Alto-do-Giz-Pegmatit / Equador / Borborema, Bergbaudistrikt / Rio Grande do Norte / Nordosten (Região Nordeste) / Brasilien

Collectors Summary

Color farblos, bräunlichgelb
Streak color weiß
Hardness (Mohs) 7.00 - 7.50
Solubility - HCl, H2SO4
Crystal System trigonal, P3

Chemism

Chemical formula

Al4Ta3O13(OH)

Empirical formula (analysis)

Al4.00(Ta2.93Nb0.07)Σ3O13(OH)

Additional chem. information

empirische Formel aus https://rruff.info, RRUFF ID: R050629.2 (aufgerufen 26.3.2020)
vereinzelt wird ein Gehalt an Fluor angegeben; bei diesen Analysen dürften jedoch kleine Verunreinigungen durch F-haltige Minerale wie Lepidolith die Ursache sein, siehe Ercit, T S, Cerny, P, Hawthorne, F C: The crystal chemistry of simpsonite. The Canadian Mineralogist 30 (1992) 663-671.

Chemical composition

Aluminium, Tantal, Sauerstoff, Wasserstoff

Unit weight: 869.60694284 u; Number of atoms in the formula: 22

Info

Empirical formula:

Al4.00(Ta2.93Nb0.07)O13(OH)

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)
Hydrogen

H

0.12

1

4.55

1.0079470

1.0079470
Oxygen

O

25.76

14

63.64

15.9994300

223.9920200
Aluminium

Al

12.41

4

18.18

26.9815382

107.9261528
Niobium

Nb

0.75

0.07

0.32

92.9063820

6.5034467
Tantalum

Ta

60.97

2.93

13.32

180.9479100

530.1773763

Analysis wt%

Ta2O5 : 71.54, Nb2O5 : 1.82, SiO2 : 1.00, TiO2 : 0.02, SnO2 : 0.10, Al2O3 : 25.20, FeO : 0.16, CaO : 0.12 (Ref: Handbook of Mineralogy Vol. 3, S. 513 (1997))

Strunz 9th edition incl. updates

4.DC.10

4: Oxide, Hydroxide (Oxide, Hydroxide, V[5,6]-Vanadate, Arsenite, Antimonite, Bismutite, Sulfite, Selenite, Tellurite, Iodate)
D: Metall: Sauerstoff = 1:2 und vergleichbare
C: Mit mittelgroßen [Kationen]: Lagen kantenverknüpfter Oktaeder
10:Simpsonit-Gruppe

Lapis Classification

IV/D.27-020

IV: OXIDE
D: Oxide mit Verhältnis Metall : Sauerstoff = 1:2 (MO2 und verwandte Verbindungen)

Classification by Hölzel

4.DK.180

4: OXIDES
D: Dioxides
K: Other Niobates, Tantalates
1: Cervantite-Group

Dana 8th edition

08.07.05.01

08: Multiple Oxides with Nb, Ta, and Ti
07: Multiple Oxides with Nb, Ta, and Ti

IMA status

Erstbeschreibung vor CNMNC-Gründung (1959), als Mineral meist anerkannt

Mineral status

anerkanntes Mineral

Optical Properties

Color

farblos, bräunlichgelb

Streak color

weiß

max. Birefringence

0.058
Birefringence chart\! Simpsonite title=Birefringence chart Simpsonite

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

2.034

RI value γ / ε

1.976

Ri mean

2.015

2V angle

Uniaxial (-)

Optical Data Luminescence

Color LW-UV (365nm)

  

gelblich weiß

Color SW-UV (254nm)

  

bläulich weiß

SW-UV Other Colors

  

gelblich weiß

Afterglow (Persistant Luminescence)

keine Daten

Crystallography

Crystal System

trigonal

Class (H-M)

3

Space Group number

143

Space Group

P3

Cell parameters a (Å)

7.377

Cell parameters b (Å)

-

Cell parameters c (Å)

4.514

Cell parameters a/b or c/a

0.612

Cell parameters c/b

-

Z

1

Volume (ų)

212.741

X-Ray Powder Diffraction

3.69(60),
3.196(30),
2.859(70),
2.609(40),
2.417(40),
2.131(60),
1.651(100),
1.395(50)
XRD chart Simpsonite

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)

7.00 - 7.50

VHN (Hardness Vickers)

1450 (ungefähre Angabe abgeleitet aus der Mohshärte)

Density (g/cm³)

6.65 (gemessen)

6.787 ( ρ calc. Mineralienatlas )

Instability

- HCl, H2SO4

(Co-)Type locality

(Co-)Type locality

Australien/Western Australia/Pilbara/North Pilbara Craton/Tabba Tabba-Pegmatit

Preface

Name from

Edward Sydney Simpson (1875-1939), für seine Verdienste um Mineralogie und Bergbau in Western Australia.
Weitere Einzelheiten finden sich in Stocklmayer, Vernon: Australian eponymous minerals and the names behind them. Simpsonite - Western Australia. Australian Journal of Mineralogy Vol. 20, Nr. 2 (2019) S. 37-40.

Author (Name, Year)

Bowley, 1939

Additional Information

Eine Zeichnung der Kristallform von Simpsonit steht in der Mitte des Logos der Mineralogical Society of Western Australia Inc.

References

Bowley, H.: Simpsonite, Report of the Department of Mines Western Australia, 93 (1938) S. 88. [erste Erwähnung des Minerals in 5 Zeilen]

Bowley, H.: Simpsonite (sp. nov.) from Tabba Tabba, Western Australia. Journal of the Royal Society of Western Australia Vol. 25 (1939) S. 89-92.

Taylor, L.: X-ray studies of simpsonite. Journal of the Royal Society of Western Australia Vol. 25 (1939) S. 93-97.

McGregor, A.M.: Simpsonite and other tantalates from Bikita, southern Rhodesia. Mineral. Mag. Vol. 27, Issue 192 (1946) S. 157-165.

von Knorrring, 0., Hornung, G.: Simpsonite and stibiotantalite from Benson pegmatite mine, Mtoko, southern Rhodesia. Mineral. Mag. Vol. 33, Issue 261 (1963) S .458-466.

Ercit, T S, Cerny, P, Hawthorne, F C: The crystal chemistry of simpsonite. The Canadian Mineralogist 30 (1992) 663-671.

Other languages

German

Simpsonit

Spanish

Simpsonita

English

Simpsonite

French

Simpsonite

Russian

Симпсонит

Alternative Name

Calogerasite

Simpsonite (of Bowley)

CNMNC symbol

Symbol

Spn

Locations with GPS information

IDs

GUSID (Global unique identifier short form) XEXUSJnb_0OV6biGo0etrA
GUID (Global unique identifier) 48D4455C-DB99-43FF-95E9-B886A347ADAC
Database ID 3539