'._('einklappen').'
 

Strüverite

Collectors Summary

Color bräunlichschwarz-met.
Streak color rotbraun
Hardness (Mohs) 6.00 - 6.50
Cleavages ausgeprägt {110}
Fracture muschelig
Crystal System tetragonal, P42/mnm

Additional information / Summary

Strüverit (nach Zambonini) = Ta-haltiger Rutil

Chemism

Chem­ical formula

(Ti,Ta,Fe2+)O2

Empir­ical formula (anal­y­sis)

(Ti0.63Ta0.16Fe0.15Nb0.07)O2

Chem­ical com­po­si­tion

Eisen, Tantal, Titan, Sauerstoff

Unit weight: 105.98702534 u; Number of atoms in the formula: 3.01

Info

Empirical formula:

(Ti0.63Ta0.16Fe0.15Nb0.07)O2

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)

Oxygen

O

30.19

2

66.45

15.9994300

31.9988600

Titanium

Ti

28.45

0.63

20.93

47.8671000

30.1562730

Iron

Fe

7.90

0.15

4.98

55.8452000

8.3767800

Niobium

Nb

6.14

0.07

2.33

92.9063820

6.5034467

Tantalum

Ta

27.32

0.16

5.32

180.9479100

28.9516656

Anal­y­sis wt%

TiO2 : 47.80, Nb2O5 : 6.20, Ta2O5 : 34.80, FeO : 7.30, SiO2 : 2.00, SnO2 : 1.30, H2O : 0.40 (Ref: Neues Jahrbuch für Mineralogie, (Monatshefte) 64)

Strunz 9th edi­tion incl. updates

4.DB.05

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

Clas­sifica­tion by Hölzel

4.DD.240

4: OXIDES
D: Dioxides
D: Rutile-Group
2: Ilmenorutile-Group

IMA sta­tus

diskreditiert, IMA Massendiskreditierung 11/2006 (Antrag 06-C)

Min­eral sta­tus

Varietät

Var­i­ety / poly­type of

Rutile

Optical Properties

Color

bräunlichschwarz-met.

Streak color

rotbraun

RI value α / ω / n

2.50

RI value γ / ε

2.50

Ri mean

~ 2.50

2V angle

Uniaxial (+)

Pleochro­ism

stark; E = braun; O = dunkelbläulichgrün oder grünlich-blau.

Anisotropism

strak

Crystallography

Crystal Sys­tem

tetragonal

Class (H-M)

4/mmm

Space Group number

136

Space Group

P42/mnm

Cell param­e­ters a (Å)

4.645

Cell param­e­ters b (Å)

-

Cell param­e­ters c (Å)

2.999

Cell param­e­ters a/b or c/a

0.646

Cell param­e­ters c/b

-

Cell param­e­ters α

90°

Cell param­e­ters β

90°

Cell param­e­ters γ

90°

Z

2

Volumne (ų)

64.706

X-Ray Pow­der Diffrac­tion

3.26(100),
2.95(30),
2.50(90),
2.31(30),
2.19(50),
1.697(100),
1.635(60),
1.369(40)

XRD chart Strüverite

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

Physical Properties

Hard­ness (Mohs)

6.00 - 6.50

VHN (Hard­ness Vick­ers)

911 - 998

Density (g/cm³)

5.59 (gemessen) 5.69 (berechnet)

5.44 ( ρ calc. Mineralienatlas )

Cleav­ages

ausgeprägt {110}

Frac­ture

muschelig

(Co-)Type locality

(Co-)Type locality

Italien/Piemont (Piemonte), Region/Verbano-Cusio-Ossola, Provinz/Craveggia

Type mate­r­ial

Natural History Museum, London, England

Natural History Museum, Paris, Frankreich

Col­lec­tion number of type mate­r­ial

1906,123 (England), 108.371 (Frankreich)

Preface

Name from

Giovanni Strüver (1842-1915), Professor der Mineralogie, Universität von Rom (Italien)

Author (Name, Year)

Zambonini, 1907

References

Rend.Accad.Sci.fis.mat., Neapel (1907), ser.3, 13, 35

Neues Jahrb. Mineral. Abh. 101 (1964), 142.

Canadian Mineralogist Vol. 44, pp. 1557-1560 (2006).

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

Rutile

TiO2

tetragonal : 4/mmm : P42/mnm

4.DB.05

Argutite

GeO2

tetragonal : 4/mmm : P42/mnm

4.DB.05

Pyrolusite

MnO2

tetragonal : 4/mmm : P42/mnm

4.DB.05

Tripuhyite

Fe3+Sb5+O4

tetragonal : 4/mmm : P42/mnm

4.DB.05

Cassiterite

SnO2

tetragonal : 4/mmm : P42/mnm

4.DB.05

Plattnerite

PbO2

tetragonal : 4/mmm : P42/mnm

4.DB.05

'Strüverite' (Var.v. Rutile)

(Ti,Ta,Fe2+)O2

tetragonal : 4/mmm : P42/mnm

4.DB.05

'Ilmenorutile' (Var.v. Rutile)

(Ti,Nb,Fe2+)O2

tetragonal : 4/mmm : P42/mnm

4.DB.05

Tugarinovite

MoO2

monoklin : 2/m : P21/c

4.DB.05

'Varlamoffite'

(Sn,Fe)(O,OH)2

tetragonal : 4/mmm : P42/mnm

4.DB.05

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

Tripuhyite

Fe3+Sb5+O4

tetragonal : 4/mmm : P42/mnm

4.DD.200

'Ilmenorutile' (Var.v. Rutile)

(Ti,Nb,Fe2+)O2

tetragonal : 4/mmm : P42/mnm

4.DD.220

'Strüverite' (Var.v. Rutile)

(Ti,Ta,Fe2+)O2

tetragonal : 4/mmm : P42/mnm

4.DD.240

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

German pages

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

English pages

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

Russian pages

Webmineral.ru - search for: Стрюверит

Mineral Dealer

German pages

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

Locations with GPS information