Bloodstone is an opaque to translucent variety of chalcedony quartz.
More specifically, it is classified as a variety of microcrystalline quartz.
Bloodstone is characterized by its dark green color and the presence of red, blood-like inclusions, which is how it earned its descriptive gemstone name.
Bloodstone is also known as ‘heliotrope’ and ‘blood jasper’.
Bloodstone was once the original birthstone for March, but it was later replaced by aquamarine. Today, bloodstone is still an alternative birthstone for March and it is the zodiacal stone for Aries.