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Hielscherite

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About HielscheriteHide

Ste. Marie aux Mines 2011
Formula:
Ca3Si(SO4)(SO3)(OH)6 · 11H2O
Colour:
Colorless
Lustre:
Vitreous
Hardness:
2 - 2½
Specific Gravity:
1.82
Crystal System:
Hexagonal
Name:
Named in honour of the German mineral collector Klaus Hielscher (b. 1957).
Closely related to kottenheimite. The first Ettringite Group mineral with essential sulfite. Forming a continuous natural solid-solution series from endmember thaumasite to a composition with at least 77 mol.% endmember hielscherite. In this series, the SO3:CO3 ratio is variable, whereas the SO4 content remains constant.

Hielscherite is very rare. At the type and other localities, sulphite-bearing thaumasite (sulphite replace carbonate) is much more commmon than hielscherite (Pekov et al., 2012).


Classification of HielscheriteHide

Approved
Approval Year:
2011

Physical Properties of HielscheriteHide

Vitreous
Transparency:
Transparent
Comment:
Crystal aggregates has a silky lustre
Colour:
Colorless
Comment:
crystal aggregates are white
Hardness:
2 - 2½ on Mohs scale
Density:
1.82(3) g/cm3 (Measured)    1.79 g/cm3 (Calculated)

Optical Data of HielscheriteHide

Type:
Uniaxial (-)
RI values:
nω = 1.494() nε = 1.476(2)
Max Birefringence:
δ = 0.018
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Moderate

Chemical Properties of HielscheriteHide

Formula:
Ca3Si(SO4)(SO3)(OH)6 · 11H2O
IMA Formula:
Ca6Si2[(SO4)2(SO3)2(OH)12] · 22H2O

Crystallography of HielscheriteHide

Crystal System:
Hexagonal
Class (H-M):
6 - Pyramidal
Space Group:
P63
Cell Parameters:
a = 11.1178(2) Å, c = 10.5381(2) Å
Ratio:
a:c = 1 : 0.948
Unit Cell V:
1,128.06 ų (Calculated from Unit Cell)
Morphology:
Matted fibrous aggregates up to 1 cm across; Groups of acicular to prismatic hexagonal crystals up to 0.3×0.3×1.5 mm.

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
9.62 (100)
5.551 (50)
4.616 (37)
3.823 (64)
3.436 (25)
2.742 (38)
2.528 (37)
2.180 (35)

Type Occurrence of HielscheriteHide

General Appearance of Type Material:
in cavities
Place of Conservation of Type Material:
Type material is deposited in the collections of the Fersman Mineralogical Museum of the Russian Academy of Sciences, Moscow, Russia, registration number 4093/1.
Geological Setting of Type Material:
Alkalin basalt
Associated Minerals at Type Locality:

Synonyms of HielscheriteHide

Relationship of Hielscherite to other SpeciesHide

Other Members of this group:
BentoriteCa6(Cr3+,Al)2(SO4)3(OH)12 · 26H2OHex. 6/mmm (6/m 2/m 2/m) : P63/mmc
BuryatiteCa3(Si,Fe,Al)(SO4)[B(OH)4]O(OH)5 · 12H2O
CarraraiteCa3(SO4)[Ge(OH)6](CO3) · 12H2OHex.
CharlesiteCa6(Al,Si)2(SO4)2[B(OH)4](OH,O)12 · 26H2OTrig. 3m : P3 1c
EttringiteCa6Al2(SO4)3(OH)12 · 26H2OTrig. 3m : P3 1c
ImayoshiiteCa3Al(CO3)[B(OH)4](OH)6 · 12H2OHex. 6 : P63
JouravskiteCa3Mn4+(SO4)(CO3)(OH)6 · 12H2OHex.
KottenheimiteCa 3Si(SO4)2(OH)6·12H2O Hex. 6/m : P63/m
Micheelsenite(Ca,Y)3Al(HPO4,CO3)(CO3)(OH)6 · 12H2OHex.
SturmaniteCa6(Fe3+,Al,Mn3+)2(SO4)2[B(OH)4](OH)12 · 25H2OTrig. 3m : P3 1c
TatarinoviteСа3Al(SO4)[B(OH)4](OH)6·12H2OHex. 6 : P63
ThaumasiteCa3(SO4)[Si(OH)6](CO3) · 12H2OHex. 6 : P63
Forms a series with:

Common AssociatesHide

Associated Minerals Based on Photo Data:
Phillipsite2 photos of Hielscherite associated with Phillipsite on mindat.org.
Thomsonite-Ca2 photos of Hielscherite associated with Thomsonite-Ca on mindat.org.
Pyrochlore Group1 photo of Hielscherite associated with Pyrochlore Group on mindat.org.

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 HielscheriteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Pekov, I.V., Chukanov, N.V., Kabalov, Y.K., Britvin, S.N., Göttlicher, J., Yapaskurt, V.O., Zadov, A.E., Krivovichev, S.V., Schüller, W., Ternes, B. (2011) Hielscherite, IMA 2011-037. CNMNC Newsletter No. 10, October 2011, page 2556.
Pekov, I.V., Chukanov, N.V., Britvin, S.N., Kabalov, Y.K., Göttlicher, J., Yapaskurt, V.O., Zadov, A.E., Krivovichev, S.V., Schüller, W., Ternes, B. (2012) The sulfite anion in ettringite-group minerals: a new mineral species hielscherite, Ca3Si(OH)6(SO4)(SO3)·11H2O, and the thaumasite-hielscherite solid-solution series. Mineralogical Magazine: 76: 1133-1152.

Internet Links for HielscheriteHide

Localities for HielscheriteHide

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.
Germany (TL)
 
  • Rhineland-Palatinate
    • Hillesheim
Sold at Ste Marie-aux-Mines show 2011; Pekov, I.V., Chukanov, N.V., Kabalov, Y.K., Britvin, S.N., Göttlicher, J., Yapaskurt, V.O., Zadov, A.E., Krivovichev, S.V., Schüller, W. and Ternes, B. (2011) Hielscherite, IMA 2011-037. CNMNC Newsletter No. 10, October 2011, page 2556.; Pekov, I.V., Chukanov, N.V., Britvin, S.N., Kabalov, Y.K., Göttlicher, J., Yapaskurt, V.O., Zadov, A.E., Krivovichev, S.V., Schüller, W., Ternes, B. (2012): The sulfite anion in ettringite-group minerals: a new mineral species hielscherite, Ca3Si(OH)6(SO4)(SO3)·11H2O, and the thaumasite-hielscherite solid-solution series. Mineralogical Magazine, 76, 1133-1152
Mineral and/or Locality  
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