Formula: Ca9B26O34(OH)24Cl4.13H2O
Origin of name: for Gordon Pringle, Canadian mineralogist
Crystal system: triclinic
Crystal class: 1
Twinning:
Unit cell:
Colour: colourless to pale yellow
Diaphaneity:
Luster: vitreous
Habit: platy to prismatic subhedral to anhedral grains to 2 mm, aggregates to 4 mm
Hardness: 3 to 4
Specific gravity: 2.21
Cleavage: 1; {110} good
Tenacity:
Streak: white
Synonyms/varieties:
Comments: dimorphous with ruitenbergite
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