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Holtstamite

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Dan Holtstam
Formula:
Ca3(Al,Mn3+)2(SiO4)2(OH)4
Colour:
Brownish-yellow
Lustre:
Vitreous
Crystal System:
Tetragonal
Name:
Honors Dr. Dan Holtstam (b. 1963) for his contributions to Swedish mineralogy and specifically Mn deposits of the Långban type.
Garnet Group. The aluminum analogue of Henritermierite.


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Classification of HoltstamiteHide

Approved
Approval Year:
2003
9.AD.25

9 : SILICATES (Germanates)
A : Nesosilicates
D : Nesosilicates without additional anions; cations in [6] and/or greater coordination

Pronounciation of HoltstamiteHide

Pronounciation:
PlayRecorded byCountry
Jolyon & Katya RalphUnited Kingdom

Physical Properties of HoltstamiteHide

Vitreous
Transparency:
Transparent
Colour:
Brownish-yellow

Optical Data of HoltstamiteHide

Type:
Uniaxial (+)
RI values:
nω = 1.718 nε = 1.746
Max Birefringence:
δ = 0.028
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
High

Chemical Properties of HoltstamiteHide

Formula:
Ca3(Al,Mn3+)2(SiO4)2(OH)4
IMA Formula:
Ca3Al2(SiO4)2(OH)4

Crystallography of HoltstamiteHide

Crystal System:
Tetragonal
Class (H-M):
4/mmm (4/m 2/m 2/m) - Ditetragonal Dipyramidal
Space Group:
I41/acd
Cell Parameters:
a = 12.337 Å, c = 11.93 Å
Ratio:
a:c = 1 : 0.967
Unit Cell V:
1,815.76 ų (Calculated from Unit Cell)

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
3.08(44)
2.978(45)
2.757(55)
2.743(100)
2.685(54)
2.501(47)
1.614(56)

Type Occurrence of HoltstamiteHide

Synonyms of HoltstamiteHide

Other Language Names for HoltstamiteHide

Simplified Chinese:四方水钙榴石
Traditional Chinese:四方水鈣榴石

Related Minerals - Nickel-Strunz GroupingHide

9.AD.05LarniteCa2SiO4Mon.
9.AD.10Calcio-olivineCa2SiO4Orth. mmm (2/m 2/m 2/m)
9.AD.15MerwiniteCa3Mg(SiO4)2Mon. 2/m : P21/b
9.AD.20BredigiteCa7Mg(SiO4)4Orth.
9.AD.25AndraditeCa3Fe3+2(SiO4)3Iso. m3m (4/m 3 2/m) : Ia3d
9.AD.25AlmandineFe2+3Al2(SiO4)3Iso. m3m (4/m 3 2/m) : Ia3d
9.AD.25Calderite(Mn2+,Ca)3(Fe3+,Al)2(SiO4)3Iso.
9.AD.25GoldmaniteCa3V3+2(SiO4)3Iso.
9.AD.25GrossularCa3Al2(SiO4)3Iso. m3m (4/m 3 2/m) : Ia3d
9.AD.25HenritermieriteCa3(Mn3+,Al)2(SiO4)2(OH)4Tet. 4/mmm (4/m 2/m 2/m) : I41/acd
9.AD.25HibschiteCa3Al2(SiO4)3-x(OH)4xIso. m3m (4/m 3 2/m) : Ia3d
9.AD.25HydroandraditeCa3Fe3+2(SiO4)3-x(OH)4x
9.AD.25KatoiteCa3Al2(SiO4)3-x(OH)4xIso.
9.AD.25KimzeyiteCa3(Zr,Ti)2((Si,Al,Fe3+)O4)3Iso.
9.AD.25KnorringiteMg3Cr2(SiO4)3Iso.
9.AD.25MajoriteMg3(Fe2+,Si,Al)2(SiO4)3Iso.
9.AD.25MorimotoiteCa3(Ti,Fe2+,Fe3+)2((Si,Fe3+)O4)3Iso.
9.AD.25PyropeMg3Al2(SiO4)3Iso.
9.AD.25SchorlomiteCa3(Ti,Fe3+)2((Si,Fe3+)O4)3Iso.
9.AD.25SpessartineMn2+3Al2(SiO4)3Iso. m3m (4/m 3 2/m) : Ia3d
9.AD.25UvaroviteCa3Cr2(SiO4)3Iso. m3m (4/m 3 2/m) : Ia3d
9.AD.25Wadalite(Ca,Mg)6(Al,Fe3+)4((Si,Al)O4)3O4Cl3Iso. 4 3m : I4 3d
9.AD.25KerimasiteCa3Zr2(SiO4)(Fe3+O4)2Iso. m3m (4/m 3 2/m) : Ia3d
9.AD.25ToturiteCa3Sn2(SiO4)(Fe3+O4)2Iso. m3m (4/m 3 2/m) : Ia3d
9.AD.25Momoiite(Mn2+,Ca)3V3+2(SiO4)3Iso. m3m (4/m 3 2/m) : Ia3d
9.AD.25EltyubyuiteCa12Fe3+10Si4O32Cl6Iso. 4 3m : I4 3d
9.AD.25HutcheoniteCa3Ti2(SiAl2)O12Iso. m3m (4/m 3 2/m) : Ia3d
9.AD.30Coffinite(U4+,Th)(SiO4)1-x(OH)4xTet.
9.AD.30HafnonHfSiO4Tet. 4/mmm (4/m 2/m 2/m) : I41/amd
9.AD.30ThoriteTh(SiO4)Tet.
9.AD.30ZirconZr(SiO4)Tet. 4/mmm (4/m 2/m 2/m) : I41/amd
9.AD.30Stetindite-(Ce)Ce(SiO4)Tet. 4/mmm (4/m 2/m 2/m) : I41/amd
9.AD.35HuttoniteThSiO4Mon.
9.AD.35Tombarthite-(Y)Y4(Si,H4)4O12-x(OH)4+2xMon.
9.AD.40EulytineBi4(SiO4)3Iso. 4 3m : I4 3d
9.AD.45ReiditeZrSiO4Tet. 4/m : I41/a

Other InformationHide

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for HoltstamiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Halenius, U., Haeussermann, U., and Harryson, H. (2005) Holtstamite, Ca3(Al,Mn 3+)2(SiO4)3-x(H4O4)x, a new tetragonal hydrogarnet from Wessels Mine, South Africa. European Journal of Mineralogy: 17(2): 375-382.

Internet Links for HoltstamiteHide

Localities for HoltstamiteHide

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
South Africa (TL)
 
  • Northern Cape Province
    • Kalahari manganese field
      • Hotazel
Am. Min. (2005): 90: 1946; European Journal of Mineralogy: 17(2): 375-382.
Mineral and/or Locality  
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