Formula: (Ba,K,Pb)Na3(Ca,Sr)(Fe,Mg,Mn)14Al(OH)2(PO4)4
Origin of name: for Pietro Sigismund, Italian mineral collector
Crystal system: monoclinic
Crystal class: 2/m
Twinning:
Unit cell:
Colour: grayish green
Diaphaneity:
Luster: greasy
Habit: imperfect to elongated crystals forming mass 4 cm across
Hardness:
Specific gravity:
Cleavage: 2; possibly
Tenacity:
Streak: white
Synonyms/varieties:
Comments: only one specimen known. Redefined as Arrojadite-(BaFe)
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