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Formula: Ca2Al(Si,Al)2O2(OH)10.2.25H2O
Hydrated phyllosilicate (sheet silicate)
Crystal System: Trigonal
Specific gravity: 1.97 calculated
Streak: White
Colour: Colourless, light green
Solubility: Strätlingite is easily decomposed by dilute hydrochloric acid
Environments
Volcanic igneous environments
Metamorphic environments
Localities
At the type locality, Mayener Feld, Mayen, Mayen-Koblenz, Rhineland-Palatinate, Germany, strätlingite occurs
as plates 0.1 to 0.5 mm across in a metamorphosed limestone
inclusion within a basaltic lava flow. Associated minerals include
ettringite, garnet group
minerals, gismondine subgroup minerals,
hydrocalumite, nepheline
and thomsonite subgroup minerals
(Mindat).
At the Bellerberg volcano, Vordereifel, Mayen-Koblenz, Rhineland-Palatinate, Germany, strätlingite occurs in
a metamorphosed limestone xenolith in
basalt. Associated minerals include
nepheline, melilite group
minerals,
garnet, thomsonite,
gismondine, ettringite and
hydrocalumite
(HOM).
Strätlingite from the Bellerberg Volcano -
Image
At the Campomorto Quarry, Pietra Massa Locality, Montalto di Castro, Viterbo Province, Lazio, Italy,
strätlingite occurs within metamorphosed clay xenoliths in
phonolite. Associated minerals include
tobermorite, ettringite,
calcite and vertumnite
(HOM).
Strätlingite from the Campomorto Quarry -
Image
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