Srebrodolskite

Formula: Ca₂Fe₂O₅

Origin of name: for Boris Srebrodolsky, Ukrainian mineralogist

Crystal system: orthorhombic

Crystal class: 2/m 2/m 2/m

Twinning:

Unit cell: 

Colour: brown, yellow, red, black

Diaphaneity: 

Luster: adamantine

Habit: crystals platy grains to 0.1 mm, granular aggregates

Hardness: 5.5

Specific gravity: 4.04

Cleavage: 

Tenacity: 

Streak: grayish brown

Synonyms/varieties:

Comments: soluble in HCl, weakly magnetic