Holtstamite Mineral Data

Holtstamite Mineral Data

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General Holtstamite Information

Chemical Formula:

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

Composition:

Molecular Weight = 440.37 gm

Calcium 27.30 % Ca 38.20 % CaO

Manganese 6.24 % Mn 8.96 % Mn₂O₃

Aluminum 9.19 % Al 17.37 % Al₂O₃

Silicon 12.76 % Si 27.29 % SiO₂

Hydrogen 0.92 % H 8.18 % H₂O

Oxygen 43.60 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Ca₃Al_1.5Mn³⁺_0.5(SiO₄)₂(OH)₄

Environment:

Garnet group, Al-dominant analogue to henritermierite.

IMA Status:

Proposed IMA 2003 (Dana # Added)

Locality:

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

Name Origin:

Commission on New Minerals and Mineral Names (CNMMN)

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)= 3.22

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), 1.614(0.56), 2.757(0.55),2.685(0.54), 2.501(0.47), 2.978(0.45), 3.08(0.44),

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

Color:

Brownish yellow.

Diaphaniety:

Transparent

Luster:

Vitreous (Glassy)

Optical Properties of Holtstamite

Gladstone-Dale:

CI calc= 0.002 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2273,KC= 0.2277

Optical Data:

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

Calculated Properties of Holtstamite

Electron Density:

r_electron=3.22 gm/cc
note: r_Holtstamite=3.22 gm/cc.

Fermion Index

Fermion Index = 0.00653
Boson Index = 0.99347

Photoelectric:

PE_Holtstamite= 5.67 barns/electron
U=PE_Holtstamite x r_electron= 18.24 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Holtstamite is Not Radioactive

Holtstamite Classification

Dana Class:

51.4.4.2 (51)Nesosilicate Insular SiO4 Groups Only

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

(51.4.4)Dana Group

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

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

Strunz Class:

VIII/AX.00-00 VIII - Silicates

VIII/AX - Unclassified Strunz Nesosilicates

VIII/AX.00 - Garnet group

Other Holtstamite Information

See Also:

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

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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: 51.4.4.2 Strunz No: VIII/AX.00-00
Locality:

Notes: