Opal is one of the most unique gemstones in the world, famous for its dazzling flashes of color known as...

Emerald is one of the world's most famous and valuable gemstones. It is the green variety of the mineral beryl and is...

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

Luster is one of the most useful physical properties used in mineral identification. It describes how light reflects...

Color is often the first characteristic people notice when examining a mineral. However, color alone is not always...

Mineral texture refers to the appearance, arrangement, size, and relationship of mineral grains or crystals within a...