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Heftetjernite

Collectors Summary

Color tiefbraun, z.T. grünlichbraun
Streak color dunkelbraun mit rötlichem Ton
Lustre Diamantglanz
Hardness (Mohs) 4.5
Cleavages vollkommen (010)
Fracture unregelmäßig
Crystal System monoklin, P2/c

Chemism

Chem­ical formula

ScTaO4

Chem­ical com­po­si­tion

Scandium, Tantal, Sauerstoff

Unit weight: 289.9015408 u; Number of atoms in the formula: 6

Info

Empirical formula:

ScTaO4

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)

Oxygen

O

22.08

4

66.67

15.9994300

63.9977200

Scandium

Sc

15.51

1

16.67

44.9559108

44.9559108

Tantalum

Ta

62.42

1

16.67

180.9479100

180.9479100

Anal­y­sis wt%

Ta2O5 : 53.58, Nb2O5 : 14.25, TiO2 : 1.61, SnO2 : 6.93, Sc2O3 : 15.59, FeO : 2.07, MnO : 3.02 (Ref: European Journal of Mineralogy 2010)

Strunz 9th edi­tion incl. updates

4.DB.30

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
30:Wolframit-Gruppe

Lapis Clas­sifica­tion

IV/D.16-050

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

Clas­sifica­tion by Hölzel

4.DH.150

4: OXIDES
D: Dioxides
H: Wolframite-Group

IMA sta­tus

anerkannt 2007

Min­eral sta­tus

anerkanntes Mineral

IMA Classification

IMA Clas­sifica­tion

Wolframite group

Optical Properties

Color

tiefbraun, z.T. grünlichbraun

Streak color

dunkelbraun mit rötlichem Ton

Diaphane­ity (Trans­parency)

durchscheinend bis transparent

Lus­tre

Diamantglanz

RI value α / ω / n

2.23

Ri mean

2.230

2V angle

Biaxial

Pleochro­ism

schwacher Pleochroismus von braun mit rötlichem Stich nach rötlichbraun

Crystallography

Crystal Sys­tem

monoklin

Class (H-M)

2/m

Space Group number

13

Space Group

P2/c

Cell param­e­ters a (Å)

4.784

Cell param­e­ters b (Å)

5.693

Cell param­e­ters c (Å)

5.120

Cell param­e­ters a/b or c/a

0.840

Cell param­e­ters c/b

0.899

Cell param­e­ters α

90°

Cell param­e­ters β

91.15

Cell param­e­ters γ

90°

Z

2

Volumne (ų)

139.417

X-Ray Pow­der Diffrac­tion

4.783(33), 3.807(32), 3.662(53), 3.000(100), 2.9570(97), 2.4877(34), 1.7639(27), 1.7157(22)

XRD chart Heftetjernite

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)

4.5

VHN (Hard­ness Vick­ers)

280 (ungefähre Angabe abgeleitet aus der Mohshärte)

Density (g/cm³)

6.44 ber.

6.905 ( ρ calc. Mineralienatlas )

Cleav­ages

vollkommen (010)

Frac­ture

unregelmäßig

Tenac­ity

spröde

(Co-)Type locality

(Co-)Type locality

Norwegen/Vestfold og Telemark, Provinz/Drangedal/Tørdal/Heftetjern-Pegmatit

Par­a­ge­n­e­sis of type mate­r­ial

Fluorit, Muskovit, Biotit, Kristiansenit, Milarit, Zirkon, Monazit

Preface

Name from

nach der Typlokalität

Author (Name, Year)

Uwe Kolitsch et al., 2010

References

Uwe Kolitsch, Roy Kristiansen, Gunnar Raade, and Ekkehart Tillmanns: Heftetjernite, a new scandium mineral from the Heftetjern pegmatite, Tørdal, Norway. Eur J Mineral 22 (2010) S. 309-316.

Neue Mineralien - IMA WEB Seite Veröffentlichungen 2006
Mineralien Welt 01/11, Neue Mineralien, Steffen Jahn

IMA group assignments

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

Ferberite

Fe2+WO4

monoklin : 2/m : P2/c

4.DB.30

Hübnerite

MnWO4

monoklin : 2/m : P2/c

4.DB.30

'Wolframite'

(Fe,Mn,Mg)WO4

monoklin : 2/m

4.DB.30

Huanzalaite

MgWO4

monoklin : 2/m : P2/c

4.DB.30

Sanmartinite

ZnWO4

monoklin : 2/m : P2/c

4.DB.30

Heftetjernite

ScTaO4

monoklin : 2/m : P2/c

4.DB.30

'Krasnoselskite'

CoWO4

4.DB.30

'Wolframo-ixiolite'

(Fe,Mn,Nb)(Nb,W,Ta)O4

monoklin : m : Pc

4.DB.30

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

Huanzalaite

MgWO4

monoklin : 2/m : P2/c

IV/D.16-005

Hübnerite

MnWO4

monoklin : 2/m : P2/c

IV/D.16-010

Ferberite

Fe2+WO4

monoklin : 2/m : P2/c

IV/D.16-020

Sanmartinite

ZnWO4

monoklin : 2/m : P2/c

IV/D.16-030

'Wolframo-ixiolite'

(Fe,Mn,Nb)(Nb,W,Ta)O4

monoklin : m : Pc

IV/D.16-040

Heftetjernite

ScTaO4

monoklin : 2/m : P2/c

IV/D.16-050

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

Sanmartinite

ZnWO4

monoklin : 2/m : P2/c

4.DH.100

Huanzalaite

MgWO4

monoklin : 2/m : P2/c

4.DH.110

Ferberite

Fe2+WO4

monoklin : 2/m : P2/c

4.DH.120

Hübnerite

MnWO4

monoklin : 2/m : P2/c

4.DH.130

Heftetjernite

ScTaO4

monoklin : 2/m : P2/c

4.DH.150

Samarskite-(Y)

YFe3+Nb2O8

orthorhombisch : mmm : Pbcn

4.DH.160

Samarskite-(Yb)

YbNbO4

monoklin : 2/m : P2/c

4.DH.165

Ishikawaite

(U,Fe,Y)NbO4

4.DH.170

Calciosamarskite

(Ca,Fe,Y)(Nb,Ta,Ti)O4

4.DH.180

IMA Number

IMA 2006-056

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

German pages

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

English pages

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

Russian pages

Webmineral.ru - search for: Хефтетьернит

Mineral Dealer

German pages

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

Locations with GPS information