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Simpsonite

Pictures (2 Images total)

Simpsonit
Views (Image: 1259467109): 1266
Simpsonit

Größe: 16x15x08 mm; Fundort: Alto-do-Giz-Pegmatit, Equador, Nordostregion, Brasilien

Copyright: Rob Lavinsky
Contribution: slugslayer 2009-11-29
Locality: Alto-do-Giz-Pegmatit / Equador / Borborema, Bergbaudistrikt / Rio Grande do Norte / Nordosten (Região Nordeste) / Brasilien
Simpsonit
Views (Image: 1259467057): 1016
Simpsonit

Größe: 13x12x08 mm; Fundort: Alto-do-Giz-Pegmatit, Equador, Nordostregion, Brasilien

Copyright: Rob Lavinsky
Contribution: slugslayer 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

Volumne (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

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.

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

Simpsonite

Al4Ta3O13(OH)

trigonal : 3 : P3

4.DC.10

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

Bahianite

Al5Sb5+3O14(OH)2

monoklin : 2/m : C2/m

IV/D.27-010

Simpsonite

Al4Ta3O13(OH)

trigonal : 3 : P3

IV/D.27-020

Alumotantite

AlTaO4

orthorhombisch : mmm : Pbcn

IV/D.27-030

Rankamaite

(Na,K)3(Ta,Nb,Al)11(O,OH)31

orthorhombisch : 222 : C222

IV/D.27-040

Sosedkoite

(K,Na)5Al2(Ta,Nb)22O60

orthorhombisch : mmm : Cmmm

IV/D.27-050

Billwiseite

Sb3+5(Nb,Ta)3WO18

monoklin : 2/m : C2/c

IV/D.27-060

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

Cervantite

Sb3+Sb5+O4

orthorhombisch : mm2 : Pna21

4.DK.100

Clinocervantite

Sb3+Sb5+O4

monoklin : 2/m : C2/c

4.DK.105

Stibiocolumbite

SbNbO4

orthorhombisch : mm2 : Pc21n

4.DK.110

Stibiotantalite

Sb3+TaO4

orthorhombisch : mm2 : Pc21n

4.DK.120

Bismutotantalite

Bi(Ta,Nb)O4

orthorhombisch : mmm : Pcnn

4.DK.130

Bismutocolumbite

Bi(Nb,Ta)O4

orthorhombisch : mmm : Pcnn

4.DK.140

Rosiaite

PbSb2O6

trigonal : 3m : P31m

4.DK.150

Alumotantite

AlTaO4

orthorhombisch : mmm : Pbcn

4.DK.160

Simpsonite

Al4Ta3O13(OH)

trigonal : 3 : P3

4.DK.180

Bahianite

Al5Sb5+3O14(OH)2

monoklin : 2/m : C2/m

4.DK.190

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

Cafetite

CaTi2O5 ·H2O

monoklin : 2/m : P21/n

08.07.03.01

Hiärneite

Ca2(Zr,Ti)5(Sb5+,Mn3+)2O16

tetragonal : 4/mmm : I41/acd

08.07.04.02

Simpsonite

Al4Ta3O13(OH)

trigonal : 3 : P3

08.07.05.01

Rankamaite

(Na,K)3(Ta,Nb,Al)11(O,OH)31

orthorhombisch : 222 : C222

08.07.06.01

Sosedkoite

(K,Na)5Al2(Ta,Nb)22O60

orthorhombisch : mmm : Cmmm

08.07.06.02

Lithiotantite

Li(Ta,Nb)3O8

monoklin : 2/m : P21/c

08.07.07.01

Jeppeite

(K,Ba)2(Ti,Fe3+)6O13

monoklin : 2/m : C2/m

08.07.09.01

Alternative Name

Calogerasite

Simpsonite (of Bowley)

CNMNC symbol

Symbol

Spn

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

German pages

DeWikiPedia - search for: Simpsonit
Google-Bilder-Suche - search for: Simpsonit
Mineralogisch-Petrographisches-Institut Hamburg - search for: Simpsonit

English pages

Mindat - search for: Simpsonite
Webmineral - search for:Simpsonite
Handbook-of-Mineralogy - search for: Simpsonite
RRUFF - Raman, XRD and other mineral data - search for: Simpsonite
RRUFF - References and PDF downloads - search for: Simpsonite
American-Mineralogist-Crystal-Structure-Database - search for: Simpsonite
Athena - search for: Simpsonite

Russian pages

Webmineral.ru - search for: Симпсонит

Mineral Dealer

German pages

hausen - Mineralgroßhandel - search for: Simpsonit
Crystal-Treasure.com - search for: Simpsonit
Bosse - search for: Simpsonit

Locations with GPS information