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Tuhualite (Tuhualit)

Pictures (5 Images total)

Tuhualite
Views (File:
1476713422
): 613
Tuhualite
Brown-violet thick tabular crystal with black Aegirine in a vesicular ignimbrite, photo Marko Burkhardt; Locality: Opo Bay, Mayor Island, New Zealand;
Copyright: christof schäfer; Contribution: Stefan
Collection: christof schäfer
Location: Neuseeland/North Island/Bay of Plenty, Region/Mayor Island (Tuhua)/Opo Bay (South East Bay)
Mineral: Tuhualite
Image: 1476713422
Rating: 9 (votes: 2)
License: Usage for Mineralienatlas project only
Tuhualite

Brown-violet thick tabular crystal with black Aegirine in a vesicular ignimbrite, photo Marko Burkhardt; Locality: Opo Bay, Mayor Island, New Zealand;
Collection: christof schäfer
Copyright: christof schäfer
Contribution: Stefan 2016-10-17
Locality: Opo Bay (South East Bay) / Mayor Island (Tuhua) / Bay of Plenty, Region / North Island / Neuseeland
Tuhualith
Views (File:
1225618298
): 952, Rating: 5.75
Tuhualith
Fundort: Opo Bay, Mayor Island, Neuseeland; Bildbreite: 2 mm
Copyright: Leonardus; Contribution: slugslayer
Location: Neuseeland/North Island/Bay of Plenty, Region/Mayor Island (Tuhua)/Opo Bay (South East Bay)
Mineral: Tuhualite
Image: 1225618298
Rating: 5.75 (votes: 4)
License: Usage for Mineralienatlas project only
Tuhualith

Fundort: Opo Bay, Mayor Island, Neuseeland; Bildbreite: 2 mm
Copyright: Leonardus
Contribution: slugslayer 2008-11-02
Locality: Opo Bay (South East Bay) / Mayor Island (Tuhua) / Bay of Plenty, Region / North Island / Neuseeland
Tuhualit-Ader in Sogdianit
Views (File:
1245606478
): 955
Tuhualit-Ader in Sogdianit
Bildbreite: 15 mm; Fundort: Dara-i-Pioz-Gletscher, Alayskiy (Alai) Range, Tien-Shan-Gebirge, Tadschikistan
Copyright: Pavel M. Kartashov; Contribution: slugslayer
Location: Tadschikistan/Republik-unterstellte Gebiete (Nohijahoi tobei Dschumhurij)/Dara-i-Pioz (Darai-Pioz)
Mineral: Tuhualite
Image: 1245606478
Rating: 5 (votes: 2)
License: Usage for Mineralienatlas project only
Tuhualit-Ader in Sogdianit

Bildbreite: 15 mm; Fundort: Dara-i-Pioz-Gletscher, Alayskiy (Alai) Range, Tien-Shan-Gebirge, Tadschikistan
Copyright: Pavel M. Kartashov
Contribution: slugslayer 2009-06-21
Locality: Dara-i-Pioz (Darai-Pioz) / Republik-unterstellte Gebiete (Nohijahoi tobei Dschumhurij) / Tadschikistan
Tuhualith
Views (File:
1290933230
): 728
Tuhualith
Bildbreite: 3 mm; Fundort: Opo Bay, Mayor Island (Tuhua), Region Bay of Plenty, North Island, Neuseeland
Copyright: Leonardus; Contribution: slugslayer
Location: Neuseeland/North Island/Bay of Plenty, Region/Mayor Island (Tuhua)/Opo Bay (South East Bay)
Mineral: Tuhualite
Image: 1290933230
License: Usage for Mineralienatlas project only
Tuhualith

Bildbreite: 3 mm; Fundort: Opo Bay, Mayor Island (Tuhua), Region Bay of Plenty, North Island, Neuseeland
Copyright: Leonardus
Contribution: slugslayer 2010-11-28
Locality: Opo Bay (South East Bay) / Mayor Island (Tuhua) / Bay of Plenty, Region / North Island / Neuseeland
Tuhualith
Views (File:
1290933261
): 757
Tuhualith
Bildbreite: 3 mm; Fundort: Opo Bay, Mayor Island (Tuhua), Region Bay of Plenty, North Island, Neuseeland
Copyright: Leonardus; Contribution: slugslayer
Location: Neuseeland/North Island/Bay of Plenty, Region/Mayor Island (Tuhua)/Opo Bay (South East Bay)
Mineral: Tuhualite
Image: 1290933261
License: Usage for Mineralienatlas project only
Tuhualith

Bildbreite: 3 mm; Fundort: Opo Bay, Mayor Island (Tuhua), Region Bay of Plenty, North Island, Neuseeland
Copyright: Leonardus
Contribution: slugslayer 2010-11-28
Locality: Opo Bay (South East Bay) / Mayor Island (Tuhua) / Bay of Plenty, Region / North Island / Neuseeland

Collectors Summary

Color blauschwarz
Streak color rötlichgrau
Hardness (Mohs) 3.00 - 4.00
Crystal System orthorhombisch, Cmca

Chemism

Chemical formula

(Na,K)Fe2+Fe3+Si6O15

Chemical composition

Eisen, Natrium, Silicium, Kalium, Sauerstoff

Unit weight: 547.21193515 u; Number of atoms in the formula: 24

Info

Empirical formula:

(Na0.75K0.25)FeFeSi6O15

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)
Oxygen

O

43.86

15

62.50

15.9994300

239.9914500
Sodium

Na

3.15

0.75

3.13

22.9897702

17.2423277
Silicon

Si

30.79

6

25.00

28.0855300

168.5131800
Potassium

K

1.79

0.25

1.04

39.0983100

9.7745775
Iron

Fe

20.41

2

8.33

55.8452000

111.6904000

Analysis wt%

SiO2 : 62.93, Al2O3 : 0.63, Fe2O3 : 14.09, FeO : 9.58, MgO : 0.42, MnO : 0.81, Na2O : 7.11, K2O : 1.74, H2O : 1.99, TiO2 : 0.42 (Ref: Mineralogical Magazine 56)

Strunz 9th edition incl. updates

9.DN.05

9: Silikate (Germanate)
D: Ketten- und Bandsilikate (Inosilikate)
N: Ketten- und Bandsilikate mit 6-periodischen Doppelketten
05:Tuhualith-Gruppe

Lapis Classification

VIII/F.30-020

VIII: SILIKATE
F: Ketten- und Bandsilikate
30: Sechserketten [Si6O18] 12- und Sechserbänder [Si12O30] 12-

Classification by Hölzel

9.DQ.140

9: SILICATES
D: Inosilicates; ~[Si2O6]4--...2-Chain
Q: ~[Si6O18]12--...6-Chain, 6-Band Stokesite-Group

Dana 8th edition

66.03.04.01

66: Inosilicates Inosilicate Double-Width Unbranched Chains, W=2
03: Inosilicates Inosilicate Double-Width Unbranched Chains, W=2 with chains P>2
04: P=6 (Tahualite group)

IMA status

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

Mineral status

anerkanntes Mineral

IMA Classification

IMA Classification

 Tuhualite group

Optical Properties

Color

blauschwarz

Streak color

rötlichgrau

max. Birefringence

0.013
Birefringence chart\! Tuhualite title=Birefringence chart Tuhualite

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

1.608

RI value β

1.612

RI value γ / ε

1.621

Ri mean

1.614

2V angle

Biaxial (+) 66°~

Crystallography

Crystal System

orthorhombisch

Class (H-M)

mmm

Space Group number

64

Space Group

Cmca

Cell parameters a (Å)

14.31

Cell parameters b (Å)

17.28

Cell parameters c (Å)

10.11

Cell parameters a/b or c/a

0.828

Cell parameters c/b

0.585

Cell parameters α

90°

Cell parameters β

90°

Cell parameters γ

90°

Z

8

Volumne (ų)

2499.968

Kristall structure

Stefano Merlino, Cristian Biagioni: Tuhualite revisited: new crystal data and structure refinements on specimens from two localities. Periodico di Mineralogia 87 (2018) S. 257-267.

X-Ray Powder Diffraction

8.62(80),
7.16(100),
5.515(80),
4.85(80),
4.35(80),
4.315(80),
3.71(80),
3.47(80)
XRD chart Tuhualite

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)

3.00 - 4.00

VHN (Hardness Vickers)

130 (ungefähre Angabe abgeleitet aus der Mohshärte)

Density (g/cm³)

2.89 (gemessen)

2.908 ( ρ calc. Mineralienatlas )

(Co-)Type locality

(Co-)Type locality

Neuseeland/North Island/Bay of Plenty, Region/Mayor Island (Tuhua)

Preface

Author (Name, Year)

Marshall, 1932

References

Handbook of Mineralogy (Anthony et al.), 2 (1995), 831

IMA group assignments

Other languages

Spanish

Tuhualita

English

Tuhualite

French

Tuhualite

German

Tuhualith

Russian

Тухуалит

Japanese

ﾂﾌﾛﾗｲﾄ

Alternative Name

German

Tuhualit

CNMNC symbol

Symbol

Tuh

Locations with GPS information