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Holtstamite

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

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

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

Pyrope

{Mg3}[Al2](Si3)O12

kubisch : m3m : Ia3d

9.AD.25

'Garnet supergroup'

neue Definition: {X3}[Y2](Z3)φ12

kubisch : kubisch-hexakisoktaedrisch

9.AD.25

Katoite

{Ca3}[Al2](☐3)(OH)12

kubisch : m3m : Ia3d

9.AD.25

Majorite

Mg3(MgSi)(SiO4)3

9.AD.25

'Melanite' (Var.v. Andradite)

9.AD.25

Rubinite

Ca3Ti3+2Si3O12

kubisch : m3m : Ia3d

9.AD.25

Wadalite

Ca6Al5Si2O16Cl3

kubisch : 43m : I43d

9.AD.25

Almandine

{Fe2+3}[Al2](Si3)O12

kubisch : m3m : Ia3d

9.AD.25

Andradite

{Ca3}[Fe3+2](Si3)O12

kubisch : m3m : Ia3d

9.AD.25

Calderite

{Mn2+3}[Fe3+2](Si3)O12

kubisch : m3m : Ia3d

9.AD.25

'Hessonite' (Var.v. Grossular)

Ca3Al2(SiO4)3

9.AD.25

'Hibschite' (Var.v. Grossular)

Ca3Al2(SiO4)3-x(OH)4*x {x<0.2-1.5}

kubisch : m3m : Ia3d

9.AD.25

Kimzeyite

{Ca3}[Zr2](SiAl2)O12

kubisch : m3m : Ia3d

9.AD.25

Uvarovite

{Ca3}[Cr3+2](Si3)O12

kubisch : m3m : Ia3d

9.AD.25

Goldmanite

{Ca3}[V3+2](Si3)O12

kubisch : m3m : Ia3d

9.AD.25

Grossular

{Ca3}[Al2](Si3)O12

kubisch : m3m : Ia3d

9.AD.25

Holtstamite

{Ca3}[Al2](Si2)(☐)O8(OH)4

tetragonal : 4/mmm : I41/acd

9.AD.25

Hutcheonite

{Ca3}[Ti2](SiAl2)O12

kubisch : m3m : Ia3d

9.AD.25

Knorringite

{Mg3}[Cr3+2](Si3)O12

kubisch : m3m : Ia3d

9.AD.25

Morimotoite

{Ca3}[TiFe2+](Si3)O12

kubisch : m3m : Ia3d

9.AD.25

Schorlomite

{Ca3}[Ti2](SiFe3+2)O12

kubisch : m3m : Ia3d

9.AD.25

Spessartine

{Mn2+3}[Al2](Si3)O12

kubisch : m3m : Ia3d

9.AD.25

Momoiite

{Mn2+3}[V3+2](Si3)O12

kubisch : m3m : Ia3d

9.AD.25

Kerimasite

{Ca3}[Zr2](SiFe3+2)O12

kubisch : m3m : Ia3d

9.AD.25

Toturite

{Ca3}[Sn4+2](SiFe3+2)O12

kubisch : m3m : Ia3d

9.AD.25

Menzerite-(Y)

{Y2Ca}[Mg2](Si3)O12

kubisch : m3m : Ia3d

9.AD.25

Elbrusite

{Ca3}[U6+0.5Zr1.5](Fe3+3)O12

kubisch : m3m : Ia3d

9.AD.25

Bitikleite

{Ca3}[Sb5+Sn4+](Al3)O12

kubisch : m3m : Ia3d

9.AD.25

Usturite

{Ca3}[Sb5+Zr](Fe3+3)O12

kubisch : m3m : Ia3d

9.AD.25

Eringaite

{Ca3}[V3+2](Si3)O12

kubisch : m3m : Ia3d

9.AD.25

Dzhuluite

{Ca3}[Sb5+Sn4+](Fe3+3)O12

kubisch : m3m : Ia3d

9.AD.25

Irinarassite

{Ca3}[Sn4+2](SiAl2)O12

kubisch : m3m : Ia3d

9.AD.25

Eltyubyuite

Ca12Fe3+10Si4O32Cl6

kubisch : 43m : I43d

9.AD.25

Adrianite

Ca12(Al4Mg3Si7)O32Cl6

kubisch : 43m : I43d

9.AD.25

Priscillagrewite-(Y)

YCa2Zr2Al3O12

kubisch : m3m : Ia3d

9.AD.25

'Hydroandradite' (Var.v. Andradite)

Ca3Fe3+2(SiO4)3-x(OH)4x

9.AD.25

'Hydrougrandite'

(Ca,Mg,Fe2+)3(Fe3+,Al)2(SiO4)3-x(OH)4x

9.AD.25

Nikmelnikovite

Ca12Fe2+Fe3+3Al3(SiO4)6(OH)20

trigonal : 3 : R3

9.AD.25

Henritermierite

{Ca3}[Mn3+2](Si2)(☐)O8(OH)4

tetragonal : 4/mmm : I41/acd

9.AD.25

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

Pyrope

{Mg3}[Al2](Si3)O12

kubisch : m3m : Ia3d

VIII/A.08-010

Almandine

{Fe2+3}[Al2](Si3)O12

kubisch : m3m : Ia3d

VIII/A.08-020

Spessartine

{Mn2+3}[Al2](Si3)O12

kubisch : m3m : Ia3d

VIII/A.08-030

Calderite

{Mn2+3}[Fe3+2](Si3)O12

kubisch : m3m : Ia3d

VIII/A.08-040

Knorringite

{Mg3}[Cr3+2](Si3)O12

kubisch : m3m : Ia3d

VIII/A.08-050

Majorite

Mg3(MgSi)(SiO4)3

VIII/A.08-060

Menzerite-(Y)

{Y2Ca}[Mg2](Si3)O12

kubisch : m3m : Ia3d

VIII/A.08-065

Grossular

{Ca3}[Al2](Si3)O12

kubisch : m3m : Ia3d

VIII/A.08-070

'Hibschite' (Var.v. Grossular)

Ca3Al2(SiO4)3-x(OH)4*x {x<0.2-1.5}

kubisch : m3m : Ia3d

VIII/A.08-080

Katoite

{Ca3}[Al2](☐3)(OH)12

kubisch : m3m : Ia3d

VIII/A.08-090

'Hydrougrandite'

(Ca,Mg,Fe2+)3(Fe3+,Al)2(SiO4)3-x(OH)4x

VIII/A.08-100

Andradite

{Ca3}[Fe3+2](Si3)O12

kubisch : m3m : Ia3d

VIII/A.08-110

Schorlomite

{Ca3}[Ti2](SiFe3+2)O12

kubisch : m3m : Ia3d

VIII/A.08-120

Morimotoite

{Ca3}[TiFe2+](Si3)O12

kubisch : m3m : Ia3d

VIII/A.08-125

Uvarovite

{Ca3}[Cr3+2](Si3)O12

kubisch : m3m : Ia3d

VIII/A.08-130

Momoiite

{Mn2+3}[V3+2](Si3)O12

kubisch : m3m : Ia3d

VIII/A.08-138

Goldmanite

{Ca3}[V3+2](Si3)O12

kubisch : m3m : Ia3d

VIII/A.08-140

Eringaite

{Ca3}[V3+2](Si3)O12

kubisch : m3m : Ia3d

VIII/A.08-145

Kimzeyite

{Ca3}[Zr2](SiAl2)O12

kubisch : m3m : Ia3d

VIII/A.08-150

Bitikleite

{Ca3}[Sb5+Sn4+](Al3)O12

kubisch : m3m : Ia3d

VIII/A.08-160

Dzhuluite

{Ca3}[Sb5+Sn4+](Fe3+3)O12

kubisch : m3m : Ia3d

VIII/A.08-165

Usturite

{Ca3}[Sb5+Zr](Fe3+3)O12

kubisch : m3m : Ia3d

VIII/A.08-170

Irinarassite

{Ca3}[Sn4+2](SiAl2)O12

kubisch : m3m : Ia3d

VIII/A.08-175

Toturite

{Ca3}[Sn4+2](SiFe3+2)O12

kubisch : m3m : Ia3d

VIII/A.08-180

Kerimasite

{Ca3}[Zr2](SiFe3+2)O12

kubisch : m3m : Ia3d

VIII/A.08-185

Elbrusite

{Ca3}[U6+0.5Zr1.5](Fe3+3)O12

kubisch : m3m : Ia3d

VIII/A.08-190

Wadalite

Ca6Al5Si2O16Cl3

kubisch : 43m : I43d

VIII/A.08-200

Eltyubyuite

Ca12Fe3+10Si4O32Cl6

kubisch : 43m : I43d

VIII/A.08-205

Holtstamite

{Ca3}[Al2](Si2)(☐)O8(OH)4

tetragonal : 4/mmm : I41/acd

VIII/A.08-210

Henritermierite

{Ca3}[Mn3+2](Si2)(☐)O8(OH)4

tetragonal : 4/mmm : I41/acd

VIII/A.08-220

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

'Hibschite' (Var.v. Grossular)

Ca3Al2(SiO4)3-x(OH)4*x {x<0.2-1.5}

kubisch : m3m : Ia3d

9.AC.700

'Hydrougrandite'

(Ca,Mg,Fe2+)3(Fe3+,Al)2(SiO4)3-x(OH)4x

9.AC.710

Henritermierite

{Ca3}[Mn3+2](Si2)(☐)O8(OH)4

tetragonal : 4/mmm : I41/acd

9.AC.720

Holtstamite

{Ca3}[Al2](Si2)(☐)O8(OH)4

tetragonal : 4/mmm : I41/acd

9.AC.730

Katoite

{Ca3}[Al2](☐3)(OH)12

kubisch : m3m : Ia3d

9.AC.760

Wadalite

Ca6Al5Si2O16Cl3

kubisch : 43m : I43d

9.AC.790

CNMNC (IMA)-Number

IMA 2003-047

CNMNC symbol

Symbol

Hts

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