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Holtstamite (Holtstamit)

Pictures (1 Images total)

Holtstamit
Views (File:
1664405343
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Holtstamit
weißer Holtstamit (Matrix) mit Einschlüssen von Vesuvianit
Copyright: Stefan; Contribution: Stefan
Collection: Lithothek der Münchener Micromounter, Collection number: A046537, Donator: Alfredo Petrov
Location: Japan/Honshu/Kanto, Region/Saitama, Präfektur/Chichibu/Chichibu Bergbaurevier/Sekkaisawa
Mineral: Holtstamite
Image: 1664405343
License: Usage for Mineralienatlas project only
Holtstamit (SNr: A046537)

weißer Holtstamit (Matrix) mit Einschlüssen von Vesuvianit
Collection: Lithothek der Münchener Micromounter
Copyright: Stefan
Contribution: Stefan 2022-09-29
Locality: Sekkaisawa / Chichibu Bergbaurevier / Chichibu / Saitama, Präfektur / Kanto, Region / Honshu / Japan

You find additional specimen at the Geolitho Museum

Collectors Summary

Color blass bräunlichgelb
Streak color weiß
Lustre Glasglanz
Hardness (Mohs) 5 - 6
Cleavages ohne deutliche Richtungen
Fracture muschelig
Crystal System tetragonal, I41/acd

Chemism

Chemical formula

{Ca3}[Al2](Si2)(☐)O8(OH)4

Chemical composition

Aluminium, Calcium, Silicium, Sauerstoff, Wasserstoff, Vakanz

Unit weight: 426.39428441 u; Number of atoms in the formula: 24

Info

Empirical formula:

{Ca3}[Al2](Si2)(Vc)O8(OH)4

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)
Vacancy

Vc

0.00

1

4.17

0.0000000

0.0000000
Hydrogen

H

0.95

4

16.67

1.0079470

4.0317880
Oxygen

O

45.03

12

50.00

15.9994300

191.9931600
Aluminium

Al

12.66

2

8.33

26.9815382

53.9630764
Silicon

Si

13.17

2

8.33

28.0855300

56.1710600
Calcium

Ca

28.20

3

12.50

40.0784000

120.2352000

Analysis wt%

SiO2 : 26.26, Al2O3 : 10.77, Fe2O3 : 6.30, Mn2O3 : 11.64, CaO : 36.76, H2O : 7.87 (Ref: European Journal of Mineralogy 2005)

Strunz 9th edition incl. updates

9.AD.25

9: Silikate (Germanate)
A: Inselsilikate (Nesosilikate)
D: Insel(Neso)silikate ohne weitere Anionen; Kationen in oktahedraler [6] und gewöhnlich größerer Koordination
25:Granat-Gruppe

Lapis Classification

VIII/A.08-210

VIII: SILIKATE
A: Inselsilikate mit [SiO4] 4--Baugruppen
8: Kationen in kubischer und oktaedrischer Koordination [8+6]; Granat-Gruppe

Classification by Hölzel

9.AC.730

9: SILICATES
A: Nesosilicates
C: Garnet-Group
7: Hydrogarnets

IMA status

anerkannt 2003

Mineral status

anerkanntes Mineral

IMA Classification

IMA Classification

 Garnet supergroup  ⇒ Silicate garnets; Henritermierite group (Z charge 8)

Optical Properties

Color

blass bräunlichgelb

Streak color

weiß

Diaphaneity (Transparency)

transparent

Lustre

Glasglanz

max. Birefringence

0.028
Birefringence chart\! Holtstamite title=Birefringence chart Holtstamite

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

1.718

RI value γ / ε

1.746

Ri mean

1.727

2V angle

Uniaxial (+)

Crystallography

Crystal System

tetragonal

Class (H-M)

4/mmm

Space Group number

142

Space Group

I41/acd

Cell parameters a (Å)

12.337

Cell parameters b (Å)

-

Cell parameters c (Å)

11.930

Cell parameters a/b or c/a

0.967

Cell parameters c/b

-

Cell parameters α

90°

Cell parameters β

90°

Cell parameters γ

90°

Z

8

Volumne (ų)

1815.765

X-Ray Powder Diffraction

3.08(44), 2.978(45), 2.757(55), 2.743(100), 2.685(54), 2.501(47), 1.614(56)
XRD chart Holtstamite

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

Crystal Structure 3D

Open larger view

Physical Properties

Hardness (Mohs)

5 - 6

VHN (Hardness Vickers)

730 (ungefähre Angabe abgeleitet aus der Mohshärte)

Density (g/cm³)

3.25

3.119 ( ρ calc. Mineralienatlas )

Cleavages

ohne deutliche Richtungen

Fracture

muschelig

Tenacity

spröde

(Co-)Type locality

(Co-)Type locality

Südafrika/Nordkap (Northern Cape), Provinz/Kalahari Manganese Field/Hotazel/Wessel's Mine (Wessels Mine)

Preface

Rareness

sehr selten

Author (Name, Year)

Hålenius & Häussermann & Harryson, 2005

References

European Journal of Mineralogy 17 (2005), 375.

Grew, E.S., Locock, A.J., Mills, S.J., Galuskina, I.O., Galuskin, E.V., Halenius, U., 2012; Nomenclature of the garnet supergroup. American Mineralogist; preprint December 2012 - [Formel].

IMA group assignments

Other languages

German

Holtstamit

Spanish

Holtstamita

French

Holtstamite

English

Holtstamite

Russian

Хольтстамит

Russian

Хольцтамите

Japanese

ホルツタムざくろ石

Traditional Chinese

四方水鈣榴石

Simplified Chinese

四方水钙榴石

CNMNC (IMA)-Number

IMA 2003-047

CNMNC symbol

Symbol

Hts

Locations with GPS information

IDs

GUSID (Global unique identifier short form) SiLFUT9x1U-z0p3q8XT1wQ
GUID (Global unique identifier) 51C5224A-713F-4FD5-B3D2-9DEAF174F5C1
Database ID 1624