A green gemstone (variety of chalcedony) with red spots or veins of iron oxide, resembling blood on stone.
Compound of blood and stone, named for the distinctive red markings on the green mineral that resemble blood spots; also called heliotrope (from Greek for 'sun-turner').
Medieval people believed bloodstone had magical healing powers because of its appearance—they thought the red marks in the stone were actual drops of blood from martyrs, making it a holy and powerful amulet.
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