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Taranakite (Taranakit)

Pictures (2 Images total)

Taranakit
Views (File:
1385816019
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Taranakit
Bildbreite: 2 mm; Fundort: Absetzerhalde, Tagebau Lichtenberg b. Ronneburg, Thüringen, Deutschland
Copyright: Stephan Wolfsried; Contribution: Hg
Location: Deutschland/Thüringen/Greiz, Landkreis/Ronneburg/Absetzerhalde
Mineral: Taranakite
Image: 1385816019
Rating: 6 (votes: 1)
License: Usage for Mineralienatlas project only
Taranakit

Bildbreite: 2 mm; Fundort: Absetzerhalde, Tagebau Lichtenberg b. Ronneburg, Thüringen, Deutschland
Copyright: Stephan Wolfsried
Contribution: Hg 2013-11-30
Locality: Absetzerhalde / Ronneburg / Greiz, Landkreis / Thüringen / Deutschland
Taranakit
Views (File:
1385718244
): 831
Taranakit
Bildbreite: 1,5 mm; Fundort: Absetzerhalde, Tagebau Lichtenberg b. Ronneburg, Thüringen, Deutschland
Copyright: Stephan Wolfsried; Contribution: Hg
Location: Deutschland/Thüringen/Greiz, Landkreis/Ronneburg/Absetzerhalde
Mineral: Taranakite
Image: 1385718244
License: Usage for Mineralienatlas project only
Taranakit

Bildbreite: 1,5 mm; Fundort: Absetzerhalde, Tagebau Lichtenberg b. Ronneburg, Thüringen, Deutschland
Copyright: Stephan Wolfsried
Contribution: Hg 2013-11-29
Locality: Absetzerhalde / Ronneburg / Greiz, Landkreis / Thüringen / Deutschland

Collectors Summary

Color blassgelb, weiß, grauweiß
Streak color weiß
Hardness (Mohs) 1 - 2
Solubility +++ Säuren, - H2O
Crystal System trigonal, R3c, R3c
Morphology skalenoedrisch

Chemism

Chemical formula

K3Al5[(PO3OH)3|PO4]2·18H2O

Chemical composition

Aluminium, Kalium, Phosphor, Sauerstoff, Wasserstoff

Unit weight: 1342.2979846 u; Number of atoms in the formula: 108

Info

Empirical formula:

K3Al5[(PO3OH)3PO4]2·18H2O

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)
Hydrogen

H

3.15

42

38.89

1.0079470

42.3337740
Oxygen

O

59.60

50

46.30

15.9994300

799.9715000
Aluminium

Al

10.05

5

4.63

26.9815382

134.9076910
Phosphorus

P

18.46

8

7.41

30.9737612

247.7900896
Potassium

K

8.74

3

2.78

39.0983100

117.2949300

Analysis wt%

K2O : 7.09, Fe2O3 : 0.42, Al2O3 : 19.03, P2O5 : 42.32, H2O : 31.10 (Ref: American Mineralogist 75)

Strunz 9th edition incl. updates

8.CH.25

8: Phosphate, Arsenate, Vanadate
C: Phosphate ohne weitere Anionen, mit H2O
H: Mit großen und mittelgroßen Kationen, RO4:H2O < 1:1
25:Francoanellit-Gruppe

Lapis Classification

VII/C.21-020

VII: PHOSPHATE, ARSENATE UND VANADATE ("Phosphate" des Registers immer einschließlich isotyper Arsenate und Vanadate!)
C: Wasserhaltige Phosphate, ohne fremde Anionen
21: Mittelgroße und große Kationen: Fe-Mn-Zn-Mg und Ca-(NH4) 1+

Classification by Hölzel

8.CE.110

8: PHOSPHATES ARSENATES VANADATES
C: Phosphates (-Anions +Water)
E: Phosphates, very large: 1,2 Vmed: 2,3
1: very large: 1, Vmed: 3 Francoannelite-Group

Dana 8th edition

39.03.06.01

39: Hydrated Acid Phosphates, etc
03: Hydrated Acid Phosphates, etc with miscellaneous formulae

IMA status

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

Mineral status

anerkanntes Mineral

Optical Properties

Color

blassgelb, weiß, grauweiß

Streak color

weiß

max. Birefringence

0.005
Birefringence chart\! Taranakite title=Birefringence chart Taranakite

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

1.507

RI value γ / ε

1.502

Ri mean

1.505

2V angle

Uniaxial (-)

Optical Data Luminescence

Luminescence

Fluoreszenz vorhanden

Color LW-UV (365nm)

  

gelblich weiß

LW-UV Intensity

schwach

Color SW-UV (254nm)

  

gelblich weiß

SW-UV Intensity

schwach

Afterglow (Persistant Luminescence)

keine Daten

Crystallography

Crystal System

trigonal

Class (H-M)

3m, 3m

Space Group number

161, 167

Space Group

R3c, R3c

Cell parameters a (Å)

8.718

Cell parameters b (Å)

-

Cell parameters c (Å)

95.18

Cell parameters a/b or c/a

10.918!

Cell parameters c/b

-

Cell parameters α

90°

Cell parameters β

90°

Cell parameters γ

120°

Z

6

Volumne (ų)

6264.841

X-Ray Powder Diffraction

15.82(100),
7.92(20),
7.47(30),
4.32(20),
3.82(40),
3.59(20),
3.36(30),
3.14(30)
XRD chart Taranakite

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

Morphology

skalenoedrisch

Crystals 3D

Open larger view

Crystal Structure 3D

Open larger view

Physical Properties

Hardness (Mohs)

1 - 2

VHN (Hardness Vickers)

18 (ungefähre Angabe abgeleitet aus der Mohshärte)

Density (g/cm³)

2.09

2.135 ( ρ calc. Mineralienatlas )

Radioactivity

kaum messbar

Instability

+++ Säuren, - H2O

(Co-)Type locality

(Co-)Type locality

Neuseeland/North Island/Taranaki, Region/New Plymouth/Sugar Loaf Islands

Preface

Author (Name, Year)

Hector & Skey, 1865

References

Dana's New Mineralogy, (Gaines et. al.), 8th edition, (1997), 744

Other languages

German

Taranakit

Spanish

Taranakita

English

Taranakite

French

Taranakite

Alternative Name

German

Minervit

Spanish

Minervita

Minervite

Palmerite

CNMNC symbol

Symbol

Tar

Locations with GPS information