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Comments: White, botryoidal mascagnite.
Location: Carola Mine, Freital, Dresden, Saxony, Germany.
Scale: Picture size 6 mm.
© Thomas Witzke / Abraxas-Verlag
Mascagnite: (NH4)2SO4 Lecontite: (NH4,K)Na(SO4)·2(H2O)
Comments: SEM BSE image of fine-grained lecontite (Le) and thenardite, occupying the space between mascagnite (M) crystals. CanMin 47:573.
Location: Coal-waste heap in Avion, northern France, that has been undergoing subsurface combustion for several decades.
Scale: See Image.
© Canadian Mineralogist