Formula: Ca2(Fe,Al)MnMn3Zn2Si2O10(OH)8
Origin of name: From locality, Franklin Furnace is the old name for Franklin, New Jersey
Crystal system: Monoclinic
Crystal class: 2
Twinning:
Unit cell:
Colour: Dark brown
Diaphaneity:
Luster: Vitreous
Habit: Thin platy crystals to 0.3mm
Hardness: 3
Specific gravity: 3.66
Cleavage: 1; {001} perfect
Tenacity:
Streak: Brown
Synonyms/varieties:
Comments:
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