Holtstamite Mineral Data

General Holtstamite Information

Chemical Formula:

Ca3(Al,Mn+++)2(SiO4)2(OH)4

Composition:

Molecular Weight = 455.40 gm

Calcium 26.40 % Ca 36.94 % CaO

Manganese 8.20 % Mn 11.79 % Mn₂O₃

Aluminum 5.63 % Al 10.63 % Al₂O₃

Iron 4.54 % Fe 6.49 % Fe₂O₃

Silicon 12.33 % Si 26.39 % SiO₂

Hydrogen 0.88 % H 7.83 % H₂O

Oxygen 42.02 % O

______ ______

100.00 % 100.07 % = TOTAL OXIDE

Empirical Formula:

Ca₃Al_0.95Mn³⁺_0.68Fe³⁺_0.37(SiO₄)₂0.99(H4O4)

Environment:

Scarce, rounded grains within vesuvianite. Garnet group, Al-dominant analogue to henritermierite.

IMA Status:

Approved IMA 2003 (Dana # Added)

Locality:

Wessels mine, Kalahari Mn field, Kuruman Hill, Cape Province, South Africa Link to MinDat.org Location Data.

Name Origin:

Named after Dr. Dan Holtstam (b. 1963) in honor of his contributions to Swedish mineralogy and specifically of Mn-deposits of the Långban type.

Synonym:

IMA2003-047

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Holtstamite Crystallography

Axial Ratios:

a:c = 1:0.967

Cell Dimensions:

a = 12.337, c = 11.93, Z = 8; V = 1,815.77 Den(Calc)= 3.33

Crystal System:

Tetragonal - Ditetragonal DipyramidalH-M Symbol (4/m 2/m 2/m) Space Group: I 4₁/acd

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 2.743(1)(402), 1.614(0.56)(426), 2.757(0.55)(420),2.685(0.54)(204), 2.501(0.47)(422), 2.978(0.45)(004), 3.082(0.44)(400), 1.633(0.39)(624), 1.671(0.37)(406),

Crystal Structure:

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Halenius U , Haussermann U , Harryson H , European Journal of Mineralogy , 17 (2005) p.375-382, Holtstamite, Ca3(Al,Mn3+)2(SiO4)3-x(H4O4)x, a new tetragonal hydrogarnet, from Wessels Mine, South Africa, Locality: Wessels Mine, South Africa

Physical Properties of Holtstamite

Cleavage:

None

Color:

Brownish yellow.

Diaphaneity:

Transparent

Fracture:

Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.

Habit:

Inclusions - Generally found as inclusions in other minerals.

Hardness:

6 - Orthoclase

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Holtstamite

Gladstone-Dale:

CI calc= 0.073 (Fair) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2198,KC= 0.237
Ncalc = 1.79

Optical Data:

Uniaxial (+), w=1.718, e=1.746, bire=0.0280.

Calculated Properties of Holtstamite

Electron Density:

Bulk Density (Electron Density)=3.31 gm/cc
note: Specific Gravity of Holtstamite =3.33 gm/cc.

Fermion Index:

Fermion Index = 0.0072814926
Boson Index = 0.9927185074

Photoelectric:

PE_Holtstamite= 7.28 barns/electron
U=PE_Holtstamite x rElectron Density= 24.11 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Holtstamite is Not Radioactive

Holtstamite Classification

Dana Class:

51.04.04.02 (51)Nesosilicate Insular SiO4 Groups Only

(51.04)with cations in [6] and >[6] coordination

(51.04.04)Garnet group (Tetragonal Hydrogarnet)

51.04.04.01 Henritermierite Ca3(Mn,Al)2(SiO4)2(OH)4 I 4₁/acd 4/m 2/m 2/m

51.04.04.02 Holtstamite! Ca3(Al,Mn)2(SiO4)2(OH)4 I 4₁/acd 4/m 2/m 2/m

Strunz Class:

09.AD.25 09 - SILICATES (Germanates)

09.A - Nesosilicates

09.AD -Nesosilicates without additional anions;

09.AD.25 Almandine Fe3Al2(SiO4)3 I a3d 4/m 3 2/m

09.AD.25 Calderite (Mn,Ca)3(Fe,Al)2(SiO4)3 I a3d 4/m 3 2/m

09.AD.25 Andradite Ca3Fe2(SiO4)3 I a3d 4/m 3 2/m

09.AD.25 Goldmanite Ca3(V,Al,Fe)2(SiO4)3 I a3d 4/m 3 2/m

09.AD.25 Hibschite Ca3Al2(SiO4)3-x(OH)4x(x=0.2-1.5) I a3d 4/m 3 2/m

09.AD.25 Knorringite Mg3Cr2(SiO4)3 I a3d 4/m 3 2/m

09.AD.25 Grossular Ca3Al2(SiO4)3 I a3d 4/m 3 2/m

09.AD.25 Henritermierite Ca3(Mn,Al)2(SiO4)2(OH)4 I 4₁/acd 4/m 2/m 2/m

09.AD.25 Katoite Ca3Al2(SiO4)3-x(OH)4xx=1.5-3 I a3d 4/m 3 2/m

09.AD.25 Majorite Mg3(Fe,Al,Si)2(SiO4)3 I a3d 4/m 3 2/m

09.AD.25 Kimzeyite Ca3(Zr,Ti)2(Si,Al,Fe)3O12 I a3d 4/m 3 2/m

09.AD.25 Morimotoite Ca3TiFeSi3O12 I a3d 4/m 3 2/m

09.AD.25 Pyrope Mg3Al2(SiO4)3 I a3d 4/m 3 2/m

09.AD.25 Spessartine Mn3Al2(SiO4)3 I a3d 4/m 3 2/m

09.AD.25 Schorlomite Ca3(Ti,Fe,Al)2[(Si,Fe,Fe)O4]3 I a3d 4/m 3 2/m

09.AD.25 Uvarovite Ca3Cr2(SiO4)3 I a3d 4/m 3 2/m

09.AD.25 Wadalite Ca6Al5Si2O16Cl3 I 43d 4 3m

09.AD.25 Holtstamite! Ca3(Al,Mn)2(SiO4)2(OH)4 I 4₁/acd 4/m 2/m 2/m

Other Holtstamite Information

References:

NAME( AmMin, v90, p1946) PHYS. PROP.(AmMin, v90, p1946) OPTIC PROP.(AmMin, v90, p1946)

See Also:

Links to other databases for Holtstamite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - MinDAT
7 - Mineralienatlas (Deutsch)
8 - Online Mineral Museum
9 - QUT Mineral Atlas
10 - Ruff.Info

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Print or Cut-and-Paste your Holtstamite Specimen Label here :

Holtstamite

Ca3(Al,Mn+++)2(SiO4)2(OH)4
Dana No: 51.04.04.02 Strunz No: 09.AD.25
Locality:

Notes: