Zodacite

Formula: Ca₄MnFe₄(PO₄)₆(OH)₄.12H₂O

Origin of name: for Peter Zodac (1894-1967), founder and editor of Rocks and Minerals magazine

Crystal system: Monoclinic

Crystal class: m or 2/m

Twinning:

Unit cell: a = 10.152 Å, b = 24.14 Å, c = 6.308 Å, β=91.14°

Colour: Light to medium yellow, colourless

Diaphaneity: Transparent

Luster: Vitreous

Habit: crystals 0.1 to 0.2 mm, in radial aggregates

Hardness: 4

Specific gravity: 2.68

Cleavage: 1; probably {010} good

Tenacity: 

Streak: Yellow white

Synonyms/varieties:

Comments: Mn and Fe analogue of montgomeryite