Reddingite

Formula: Mn₃(PO₄)₂.3H₂O

Origin of name: after locality Redding township, Fairfield County, Connecticut, USA

Crystal system: orthorhombic

Crystal class: 2/m 2/m 2/m

Twinning:

Unit cell: a = 9.49 Å, b = 10.08 Å, c = 8.70 Å

Colour: pinkish to yellowish, white, colourless, reddish brown to dark brown

Diaphaneity: 

Luster: vitreous to resinous

Habit: crystals octahedral or tabular, in parallel groups, massive, granular, coarse fibrous

Hardness: 3 to 3.5

Specific gravity: 3.23

Cleavage: 1; {010} poor

Tenacity: 

Streak: 

Synonyms/varieties:

Comments: series with phosphoferrite