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 ...

Snowflake obsidian is a form of volcanic glass that features white or grayish “snowflake” shapes made of embedded cristobalite. These pretty patterns are not artificially added as a cheap holiday ...