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Foordite

Collectors Summary

Color bräunlichgelb
Streak color gelblichweiß
Hardness (Mohs) 6
Crystal System monoklin, C2/c

Chemism

Chem­ical formula

Sn2+(Nb,Ta)2O6

Chem­ical com­po­si­tion

Niob, Tantal, Zinn, Sauerstoff

Unit weight: 444.540808 u; Number of atoms in the formula: 9

Info

Empirical formula:

Sn(Nb0.75Ta0.25)2O6

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)

Oxygen

O

21.59

6

66.67

15.9994300

95.9965800

Niobium

Nb

31.35

1.5

16.67

92.9063820

139.3595730

Tin

Sn

26.70

1

11.11

118.7107000

118.7107000

Tantalum

Ta

20.35

0.5

5.56

180.9479100

90.4739550

Anal­y­sis wt%

SnO : 25.40, PbO : 6.00, Ta2O5 : 28.70, Nb2O5 : 40.10 (Ref: Canadian Mineralogist 88)

Strunz 9th edi­tion incl. updates

4.DG.15

4: Oxide, Hydroxide (Oxide, Hydroxide, V[5,6]-Vanadate, Arsenite, Antimonite, Bismutite, Sulfite, Selenite, Tellurite, Iodate)
D: Metall: Sauerstoff = 1:2 und vergleichbare
G: Mit großen (± mittelgroßen) [Kationen]; Ketten kantenverknüpfter Oktaeder
15:Foordit-Gruppe

Lapis Clas­sifica­tion

IV/D.29-010

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

Clas­sifica­tion by Hölzel

4.DK.200

4: OXIDES
D: Dioxides
K: Other Niobates, Tantalates
2: Foordit-Group

Dana 8th edi­tion

08.03.10.02

08: Multiple Oxides with Nb, Ta, and Ti
03: Multiple Oxides with Nb, Ta, and Ti where A (B2O6)

IMA sta­tus

Anerkannt von der CNMNC

Min­eral sta­tus

anerkanntes Mineral

Optical Properties

Color

bräunlichgelb

Streak color

gelblichweiß

max. Birefrin­gence

0.10>

Birefringence chart\! Foordite title=Birefringence chart Foordite

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

2.29

Ri mean

2.29

2V angle

Biaxial (+) mod

Crystallography

Crystal Sys­tem

monoklin

Class (H-M)

2/m

Space Group number

15

Space Group

C2/c

Cell param­e­ters a (Å)

17.093

Cell param­e­ters b (Å)

4.877

Cell param­e­ters c (Å)

5.558

Cell param­e­ters a/b or c/a

3.505

Cell param­e­ters c/b

1.140

Cell param­e­ters α

90°

Cell param­e­ters β

90.85

Cell param­e­ters γ

90°

Z

4

Volumne (ų)

463.278

X-Ray Pow­der Diffrac­tion

3.592(40),
3.100(50),
3.071(50),
2.849(100),
2.439(20),
1.853(30),
1.694(40),
1.681(40)

XRD chart Foordite

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

Crystal Structure 3D

Open larger view

Physical Properties

Hard­ness (Mohs)

6

VHN (Hard­ness Vick­ers)

730 (ungefähre Angabe abgeleitet aus der Mohshärte)

Density (g/cm³)

6.734 (gemessen)

6.373 ( ρ calc. Mineralienatlas )

Preface

Author (Name, Year)

Cerny & Fransolet & Ercit & Chapman, 1988

References

Canadian Mineralogist 26 (1988), 889

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

Foordite

Sn2+(Nb,Ta)2O6

monoklin : 2/m : C2/c

4.DG.15

Thoreaulite

Sn2+Ta2O6

monoklin : 2/m : C2/c

4.DG.15

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

Foordite

Sn2+(Nb,Ta)2O6

monoklin : 2/m : C2/c

IV/D.29-010

Thoreaulite

Sn2+Ta2O6

monoklin : 2/m : C2/c

IV/D.29-020

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

Foordite

Sn2+(Nb,Ta)2O6

monoklin : 2/m : C2/c

4.DK.200

Thoreaulite

Sn2+Ta2O6

monoklin : 2/m : C2/c

4.DK.210

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

Thoreaulite

Sn2+Ta2O6

monoklin : 2/m : C2/c

08.03.10.01

Foordite

Sn2+(Nb,Ta)2O6

monoklin : 2/m : C2/c

08.03.10.02

Changbaiite

PbNb2O6

trigonal : 3m : R3m

08.03.11.01

Rosiaite

PbSb2O6

trigonal : 3m : P31m

08.03.11.02

Kobeite-(Y)

(Y,U)(Ti,Nb)2(O,OH)6

08.03.12.01

CNMNC (IMA)-Number

IMA 1984-070

CNMNC symbol

Symbol

Foo

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

German pages

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

English pages

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

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German pages

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