Mineral deposits can create markings that look like forests or mountains, and experts say each stone is distinctive.

Moroccan agates from Sidi Rahal occur within Triassic basaltoids as lens-shaped specimens in sizes up to 25 cm. Their coloration and internal structure are quite specific and characteristic for this ...

The finest-quality fire agates can rival Australian black opal. Because they are a form of chalcedony quartz, fire agates are also more durable than opal, making them suitable for virtually any ...

this banded variety of chalcedony has been revered for its ability to balance, protect, and transform. In this comprehensive ...

T hundereggs look like regular rocks from the outside, but contain intricate and colorful mineral patterns inside — often ...

The Bible makes many references to jewels and precious stones. This is not so surprising, since in every civilisation gemstones have been highly prized and sought after. There are many gemstones and ...