Refractive index (RI) is one of the most important optical properties used in mineralogy and gemology. It measures how...

The optical properties of minerals describe how minerals interact with visible light. These properties include color,...

Radioactive minerals are naturally occurring minerals that contain unstable radioactive elements such as uranium (U),...

Sapphire is one of the world's most famous gemstones and a variety of the mineral corundum. Although blue sapphire is...

Ruby is one of the most famous and valuable gemstones in the world. It is the red variety of the mineral corundum and...

Apatite is one of the most important phosphate minerals on Earth and serves as the primary source of phosphorus used...