Ferrobarroisite

Formula:  (CaNa)Fe₅AlFe(Si₇Al)O₂₂(OH)₂

Origin of name:   From ferrous iron (Fe²⁺) and barroisite

Crystal system:   Monoclinic

Crystal class:  2/m

Twinning:

Unit cell: 

Colour:  Bluish green

Diaphaneity:  Semitransparent

Luster:  Vitreous

Habit:  Crystals, prismatic

Hardness:  5 to 6

Specific gravity: 

Cleavage:  3; {110} perfect, {100} and {001} partings

Tenacity: 

Streak: 

Synonyms/varieties:

Comments:   Series with barroisite and with aluminobarrosite