Strätlingite (original) (raw)

A valid IMA mineral species

About SträtlingiteHide

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Formula:

Ca2Al2SiO7 · 8H2O

Colour:

Colourless, light green.

Specific Gravity:

1.97 (Calculated)

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").

Unique IdentifiersHide

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Long-form identifier:

mindat:1:1:3809:2

IMA Classification of SträtlingiteHide

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IMA Formula:

Ca2Al(Si,Al)2O2(OH)10 · 2.25H2O

Type description reference:

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.

Physical Properties of SträtlingiteHide

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Colour:

Colourless, light green.

Cleavage:

Perfect
On {0001}

Density:

1.97(1) g/cm3 (Calculated)

Optical Data of SträtlingiteHide

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Chemistry of SträtlingiteHide

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Mindat Formula:

Ca2Al2SiO7 · 8H2O

Crystallography of SträtlingiteHide

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Class (H-M):

3_m_ - Ditrigonal Pyramidal

Cell Parameters:

a = 5.745(7) Å, c = 37.77(1) Å

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:

Geological EnvironmentHide

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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:

Related Minerals - Strunz-mindat GroupingHide

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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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References for SträtlingiteHide

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Localities for SträtlingiteHide

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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

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- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for references and 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 (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 ⓘ Boisséjour	XRD analysis (B. Devouard and E. Médard, Clermont-Ferrand)
Germany
Baden-Württemberg Freiburg Region Waldshut Waldshut-Tiengen Detzeln ⓘ Porphyry quarry	Hanneberg et al. (2009) +1 other reference
Bavaria Lower Bavaria Passau District Hauzenberg Kropfmühl ⓘ Kropfmühl Mine	Habel (2011)
Rhineland-Palatinate Mayen-Koblenz Mayen ⓘ Mayener Feld (TL)	Hentschel et al. (1976)
Mendig Bell ⓘ Rothenberg Quarry	Hentschel (1983)
Vordereifel Ettringen ⓘ Caspar quarry	Hentschel (1983)
Vulkaneifel Daun Üdersdorf ⓘ Emmelberg	Schüller et al. (1986)
Italy
Lazio Metropolitan City of Rome Capital Rome Valleranello ⓘ Vallerano Quarries	Carlini et al. (2018)
Viterbo Province Montalto di Castro Pietra Massa Locality ⓘ Campomorto Quarry	Passaglia et al. (1982)
Umbria Perugia Province Spoleto ⓘ Colle Fabbri	Wheeler et al. (1996) +2 other references
Romania
Brașov County ⓘ Racoş (Racoşul de Jos)	Szakáll
ⓘ Basalt quarry	Szakáll et al. (2010)