What's the difference between bloodstone and chalcedony?

Bloodstone

Definition:

• (n.) A green siliceous stone sprinkled with red jasper, as if with blood; hence the name; -- called also heliotrope.
• (n.) Hematite, an ore of iron yielding a blood red powder or "streak."

Example Sentences:

Chalcedony

Definition:

• (n.) A cryptocrystalline, translucent variety of quartz, having usually a whitish color, and a luster nearly like wax.

Example Sentences:

• (1) The free silicic oxide is presented by low-temperature crystobalite and quartz, more rarely opal and chalcedony.