Heliotrope or blood-stone, as this variety is commonly called, is a
dark-green quartz, translucent to opaque, and covered with small red
spots or blood-colored blotches, from which the stone derives the name
of blood-stone.
This stone has long been used for seal and signet purposes, and many
fine intaglios and cameos carved in blood-stone are in existence.
Bucharia, Tartary, Siberia, East India, China, the island of Rum in the
Hebrides, the United States, and Canada are some of the places where
the heliotrope is found.