Save this article to read it later. Find this story in your account’s ‘Saved for Later’ section. Until recently, I only thought of carnelian as the stone in the Hellenistic relics at the Metropolitan ...

Carnelian is a variety of quartz mineral. It forms in a variety of environments, including sedimentary, igneous, and metamorphic rocks. It is known for its translucent to opaque orange or ...

The world is a boundless treasure filled to the top with surprises that extend far and wide beyond rock and earth. Buried deep within its crust are gemstones nature’s masterpieces of art which have ...