These two aluminium sulfates are just a few mm wide, but beautiful under magnification. The white tuft is Pickeringite, a magnesium aluminium sulfate, sitting on a bed of dark green Voltaite, potassium iron aluminim sulfate. From Grotta dell'Allume, Porto Levante, Sicily, Italy.
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Ettringite - is a hydrous calcium aluminium sulfate mineral with formula: It is a colorless to yellow mineral crystallizing in the trigonal system. Wessels Mine, Hotazel, South Africa x x cm - ex Charles Key Collection