Holly has a degree in Medical Biochemistry from the University of Leicester. Her scientific interests include genomics, personalized medicine, and bioethics.View full profile Holly has a degree in ...

Obsidian is a popular crystal, prized for its deep black colour and glassy texture. It's formed from volcanic lava that cools rapidly, resulting in its smooth, often shiny appearance. Color and ...

There is a chunk of black obsidian along my yard path, and the blackness is intense, especially on a rainy day. The stone is igneous and comes from a volcanic origin, spewed from the depths by a ...