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⇱ Strätlingite: Mineral information, data and localities.

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Strätlingite

A valid IMA mineral species
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About SträtlingiteHide

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Formula:
Ca2Al2SiO7 · 8H2O
Colour:
Colourless, light green.
Specific Gravity:
1.97 (Calculated)
Crystal System:
Trigonal
Name:
Named after Dr.-Ing. Wolf Strätling, German cement engineer who synthesized the compound in 1938.
Known to occur also in many blended cements ("gehlenite hydrate - C2ASH8").


Name EncodingHide

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ASCII-7:
Stratlingite

Unique IdentifiersHide

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Mindat ID:
3809
Long-form identifier:
mindat:1:1:3809:2

IMA Classification of SträtlingiteHide

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Approved
IMA Formula:
Ca2Al(Si,Al)2O2(OH)10 · 2.25H2O
Approval year:
1975
First published:
1976

Classification of SträtlingiteHide

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9.EG.25

9 : SILICATES (Germanates)
E : Phyllosilicates
G : Double nets with 6-membered and larger rings
77.2.5.1

77 : TECTOSILICATES Zeolites
2 : Zeolite group - related species
16.9.31

16 : Silicates Containing Aluminum and other Metals
9 : Aluminosilicates of Ca

Mineral SymbolsHide

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As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.

SymbolSourceReference
SräIMA–CNMNCWarr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43

Physical Properties of SträtlingiteHide

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Transparency:
Transparent
Colour:
Colourless, light green.
Streak:
White
Cleavage:
Perfect
On {0001}
Density:
1.97(1) g/cm3 (Calculated)

Optical Data of SträtlingiteHide

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Type:
Uniaxial (-)
Comments:
ε: = n.d.

Chemistry of SträtlingiteHide

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Mindat Formula:
Ca2Al2SiO7 · 8H2O
Element Weights:
Element% weight
O57.370 %
Ca19.161 %
Al12.900 %
Si6.714 %
H3.855 %

Calculated from ideal end-member formula.

Crystallography of SträtlingiteHide

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Crystal System:
Trigonal
Class (H-M):
3m - Ditrigonal Pyramidal
Space Group:
R3m
Cell Parameters:
a = 5.745(7) Å, c = 37.77(1) Å
Ratio:
a:c = 1 : 6.574
Unit Cell V:
1,079.59 ų (Calculated from Unit Cell)
Comment:
From Rinaldi et al. (1990)

X-Ray Powder DiffractionHide

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Powder Diffraction Data:
d-spacingIntensity
12.5 Å(100)
4.16 Å(100)
6.2 Å(70)
2.87 Å(70)
2.61 Å(40)
2.49 Å(40)
2.12 Å(40)

Geological EnvironmentHide

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Paragenetic Mode(s):
Paragenetic ModeEarliest Age (Ga)
Stage 7: Great Oxidation Event<2.4
47a : [Near-surface hydration of prior minerals]

Type Occurrence of SträtlingiteHide

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General Appearance of Type Material:
Plates 0.1-0.5 mm in diameter.
Place of Conservation of Type Material:
University of Erlangen, Nuremberg, Germany.
National Museum of Natural History (Smithsonian), Washington, D.C., USA, 137064.
Geological Setting of Type Material:
Metamorphosed limestone inclusion within a basaltic lava flow.
Associated Minerals at Type Locality:

Synonyms of SträtlingiteHide

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Other Language Names for SträtlingiteHide

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Common AssociatesHide

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Associated Minerals Based on Photo Data:
4 photos of Strätlingite associated with VertumniteCa4Al4Si4O6(OH)24 · 3H2O
2 photos of Strätlingite associated with EttringiteCa6Al2(SO4)3(OH)12 · 26H2O
1 photo of Strätlingite associated with OpalSiO2 · nH2O
1 photo of Strätlingite associated with Melilite GroupCa2M(XSiO7)

Related Minerals - Strunz-mindat GroupingHide

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9.EG.05CymriteBaAl2Si2(O,OH)8 · H2OMon. 2 : P21
9.EG.10Naujakasite(Na,K)6(Fe2+,Mn2+,Ca)(Al,Fe)4Si8O26Mon.
9.EG.10ManganonaujakasiteNa6(Mn2+,Fe2+)Al4Si8O26Mon. 2/m : B2/m
9.EG.15DmisteinbergiteCa(Al2Si2O8)Trig. 32 : P312
9.EG.20KampfiteBa12(Si11Al5)O31(CO3)8Cl5Mon. m
9.EG.25VertumniteCa4Al4Si4O6(OH)24 · 3H2OMon. 2/m : P21/m
9.EG.30Eggletonite(Na,K,Ca)2(Mn,Fe)8(Si,Al)12O29(OH)7 · 11H2OMon.
9.EG.30Ganophyllite(K,Na,Ca)2Mn8(Si,Al)12(O,OH)32 · 8H2OMon. 2/m
9.EG.30Tamaite(Ca,K,Ba,Na)3-4Mn24(Si,Al)40(O,OH)112 · 21H2OMon. 2/m : P21/b
9.EG.35ZussmaniteK(Fe,Mg,Mn)13(Si,Al)18O42(OH)14Trig. 3 : R3
9.EG.35CoombsiteKMn2+13(Si,Al)18O42(OH)14Trig.
9.EG.40ChalcoditeK(Fe3+,Mg,Fe2+)8(Si,Al)12(O,OH)27Tric. 1 : P1
9.EG.40Parsettensite(K,Na,Ca)7.5(Mn,Mg)49Si72O168(OH)50 · nH2OMon. 2/m : B2/m
9.EG.40Franklinphilite(K,Na)4(Mn2+,Mg,Zn)48(Si,Al)72(O,OH)216 · 6H2OTric.
9.EG.40LennilenapeiteK6-7(Mg,Mn,Fe,Zn)48(Si,Al)72(O,OH)216 · 16H2OTric.
9.EG.40Stilpnomelane(K,Ca,Na)(Fe,Mg,Al)8(Si,Al)12(O,OH)36 · nH2OTric. 1 : P1
9.EG.45Latiumite(Ca,K)4(Si,Al)5O11(SO4,CO3)Mon. 2 : P21
9.EG.45LevantiteKCa3Al2(SiO4)(Si2O7)(PO4)Mon. 2 : P21
9.EG.45TuscaniteKCa6(Si,Al)10O22(SO4,CO3)2(OH) · H2OMon. 2/m : P21/b
9.EG.50JagoitePb18Fe3+4[Si4(Si,Fe3+)6][Pb4Si16(Si,Fe)4]O82Cl6Hex. 6m2 : P6c2
9.EG.50Friisite Pb8Al3Si8O27Cl3Hex. 6m2 : P62c
9.EG.55WickenburgiteCaPb3Al2Si10O24(OH)6Trig. 3m : P31c
9.EG.60HyttsjöitePb18Ba2Ca5Mn2+2Fe3+2Si30O90Cl · 6H2OTrig. 3 : R3
9.EG.65ArmbrusteriteK5Na7Mn15[(Si9O22)4](OH)10 · 4H2OMon. 2/m : B2/m
9.EG.70RoymilleritePb24Mg9(Si10O28)(CO3)10(BO3)(SiO4)(OH)13O5Tric. 1 : P1
9.EG.70Britvinite[Pb7(OH)3F(BO3)2(CO3)][Mg4.5(OH)3(Si5O14)]Tric. 1 : P1
9.EG.75KayupovaiteNa2Mn10[(Si14Al2)O38(OH)8] · 7H2OMon. 2/m : B2/b
9.EG.75UM1989-30-SiO:AlBaCaFeHKMgMn(Ba,Ca)(Mn,Fe,Mg)22(Si,Al)32O76(OH)16 · 12H2O
9.EG.75Bannisterite(Ca,K,Na)(Mn2+,Fe2+)10(Si,Al)16O38(OH)8 · nH2OMon. 2/m : B2/b

Other InformationHide

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Thermal Behaviour:
DTA curve shows endothermic breaks at l3l C, l81 C, and 226 C, and a sharp exothermic break at 990 C. The loss of weight curve shows a loss of 4H2O to 138 C, when an abrupt decrease in a and c occurs. The exothermic break corresponds to the crystallization of gehlenite.
Notes:
Easily decomposed by dilute HCl.
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

Internet Links for SträtlingiteHide

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mindat.org URL:
https://www.mindat.org/min-3809.html
Please feel free to link to this page.

References for SträtlingiteHide

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Reference List:

Localities for SträtlingiteHide

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

Locality ListHide

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👁 Image
- This locality has map coordinates listed. 👁 Image
- This locality has estimated coordinates. ⓘ - Click for references and further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. 👁 Image
- Good crystals or important locality for species. 👁 Image
- 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 (e.g. from pseudomorphs).

All localities listed without proper references should be considered as questionable.
France
  • Auvergne-Rhône-Alpes
    • Puy-de-Dôme
      • Clermont-Ferrand
        • Beaumont
XRD analysis (B. Devouard and E. Médard, Clermont-Ferrand)
Germany
  • Baden-Württemberg
    • Freiburg Region
      • Waldshut
        • Waldshut-Tiengen
          • Detzeln
Hanneberg et al. (2009) +1 other reference
  • Bavaria
    • Lower Bavaria
      • Passau District
        • Hauzenberg
          • Kropfmühl
Habel (2011)
  • Rhineland-Palatinate
    • Mayen-Koblenz
      • Mayen
Hentschel et al. (1976)
      • Mendig
        • Bell
Hentschel (1983)
      • Vordereifel
        • Ettringen
Hentschel (1983)
    • Vulkaneifel
      • Daun
        • Üdersdorf
Schüller et al. (1986)
Italy
  • Lazio
    • Metropolitan City of Rome Capital
      • Rome
        • Valleranello
Carlini et al. (2018)
    • Viterbo Province
      • Montalto di Castro
        • Pietra Massa Locality
Passaglia et al. (1982)
  • Umbria
    • Perugia Province
      • Spoleto
Wheeler et al. (1996) +2 other references
Romania
  • Brașov County
Szakáll
Szakáll et al. (2010)
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