Formula: Hg16(Ni,Mg)6(CO3)12(OH)12(H3O)8.3H2O
Origin of name: for Jan Szymanski, Canadian crystallographer
Crystal system: hexagonal
Crystal class: 6
Twinning:
Unit cell:
Colour: blue-gray to blue-green
Diaphaneity: transparent
Luster: vitreous
Habit: disseminated euhedral crystals to 0.05 by 0.4 mm and millimeter size sprays
Hardness:
Specific gravity:
Cleavage: 1; {10-10} poor
Tenacity:
Streak: pale blue
Synonyms/varieties:
Comments: whitens on cold dilute HCl, reacts same with minor effervescence in concentrated HCl
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