An iron manganese phosphate, typically dark green to blackish, often fibrous. It's a grounding stone promoting strength and perseverance.
Greenish-Black, Dark Green, Olive Green, forms fibrous or radiating masses
Rockbridgeite is classified as a minerals mineral which typically crystallizes in the orthorhombic system. Its chemical formula is Fe2+Fe3+4(PO4)3(OH)5. Common crystal habits include euhedral crystals rare; typically fibrous in crusts, botryoidal and drusy masses.