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Holtite (Holtit)

Pictures (1 Images total)

Holtit-Leisten
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1243626901
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Holtit-Leisten
Größe: 50x40x35 mm; Fundort: Vasin-Myl'k, Kola, Murmansk, Russland
Copyright: Pavel M. Kartashov; Contribution: slugslayer
Location: Russland/Nordwestrussland, Föderationskreis/Murmansk, Oblast/Kola-Halbinsel/Voron'i Tundry/Vasin-Myl'k, Berg
Mineral: Holtite
Image: 1243626901
Rating: 7.5 (votes: 2)
License: Usage for Mineralienatlas project only
Holtit-Leisten

Größe: 50x40x35 mm; Fundort: Vasin-Myl'k, Kola, Murmansk, Russland
Copyright: Pavel M. Kartashov
Contribution: slugslayer 2009-05-29
Locality: Vasin-Myl'k, Berg / Voron'i Tundry / Kola-Halbinsel / Murmansk, Oblast / Nordwestrussland, Föderationskreis / Russland

Collectors Summary

Color blassbraun, rosa
Streak color weiß
Hardness (Mohs) 8.5
Solubility - Säuren
Crystal System orthorhombisch, Pnma

Chemism

Chemical formula

(Ta0.6☐0.4)Al6BSi3O18

Chemical composition

Aluminium, Silicium, Tantal, Bor, Sauerstoff, Vakanz

Unit weight: 653.516005204 u; Number of atoms in the formula: 29

Info

Empirical formula:

(Ta0.6Vc0.4)Al6BSi3O18

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)
Vacancy

Vc

0.00

0.4

1.38

0.0000000

0.0000000
Boron

B

1.65

1

3.45

10.8117000

10.8117000
Oxygen

O

44.07

18

62.07

15.9994300

287.9897400
Aluminium

Al

24.77

6

20.69

26.9815382

161.8892292
Silicon

Si

12.89

3

10.34

28.0855300

84.2565900
Tantalum

Ta

16.61

0.6

2.07

180.9479100

108.5687460

Analysis wt%

SiO2 : 18.24, Sb2O3 : 17.29, As2O3 : 2.80, B2O3 : 4.98, Ta2O5 : 10.93, Al2O3 : 43.50 (Ref: Mineralogical Magazine 2009)

Strunz 9th edition incl. updates

9.AJ.10

9: Silikate (Germanate)
A: Inselsilikate (Nesosilikate)
J: Insel(Neso)silikate mit BO3 Triangeln und /oder B[4], Be[4] Tetraedern, eckenteilend mit SiO4
10:Dumortierit-Gruppe

Lapis Classification

VIII/B.31-030

VIII: SILIKATE
B: Inselsilikate mit tetraederfremden Anionen
31: Kationen mit Koordinationszahlen zwischen [8] und [12]; Beryllium- und Bor-Inselsilikate

Classification by Hölzel

9.AK.120

9: SILICATES
A: Nesosilicates
K: Boro and Beryllo Nesosilicates
1: C small; Dumortierite-Kornerupine-Group

IMA status

Anerkannt von der CNMNC

Mineral status

anerkanntes Mineral

IMA Classification

IMA Classification

 Dumortierite supergroup  ⇒ Holtite group

Optical Properties

Color

blassbraun, rosa

Streak color

weiß

max. Birefringence

0.015
Birefringence chart\! Holtite title=Birefringence chart Holtite

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

1.745

RI value β

1.758

RI value γ / ε

1.760

Ri mean

1.754

2V angle

Biaxial (-) 52°

Optical Data Luminescence

Color LW-UV (365nm)

  

gelb

LW-UV Intensity

stark

Color SW-UV (254nm)

  

orange

SW-UV Intensity

schwach

SW-UV Other Colors

  

bläulich weiß

Afterglow (Persistant Luminescence)

keine Daten

Crystallography

Crystal System

orthorhombisch

Class (H-M)

mmm

Space Group number

62

Space Group

Pnma

Cell parameters a (Å)

4.690

Cell parameters b (Å)

11.897

Cell parameters c (Å)

20.385

Cell parameters a/b or c/a

0.394

Cell parameters c/b

1.713

Cell parameters α

90°

Cell parameters β

90°

Cell parameters γ

90°

Z

4

Volumne (ų)

1137.42

X-Ray Powder Diffraction

10.28(100),
5.93(30),
5.89(30),
5.12(20),
5.08(30),
2.94(40),
2.362(20),
2.338(30)
XRD chart Holtite

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)

8.5

VHN (Hardness Vickers)

2800 (ungefähre Angabe abgeleitet aus der Mohshärte)

Density (g/cm³)

3.90 (gemessen)

3.816 ( ρ calc. Mineralienatlas )

Instability

- Säuren

(Co-)Type locality

(Co-)Type locality

Australien/Western Australia/Blackwood River/Greenbushes Tinfield/Seifen

Preface

Author (Name, Year)

Pryce, 1971

References

Mineralogical Magazine 73 (2010) S.1033-1050

Pryce M W (1971) Holtite: a new mineral allied to dumortierite, Mineralogical Magazine 38, 21-25

Pieczka A, Evans R J, Grew E S, Groat L A, Ma C, Rossman G R (2013) The dumortierite supergroup. I. A new nomenclature for the dumortierite and holtite groups. Mineralogical Magazine 77, 2825-2839

IMA group assignments

Other languages

German

Holtit

Spanish

Holtita

French

Holtite

English

Holtite

Russian

Холтит

CNMNC (IMA)-Number

IMA 1969-029

CNMNC symbol

Symbol

Hlt

Locations with GPS information