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Ettringite

Type Locality
Ettringer Feld, Western lava flow, Bellerberg volcano, Ettringen, Mayen, Eifel, Rhineland-Palatinate, Germany
Mineral Data
Ca6Al2(SO4)3(OH)12·26H2O
Strunz: 
7.DG.15
Physical Properties
Hardness: 
2.0 - 2.5
Photos