Sugilite is a rare cyclosilicate that occurs in a range of vivid colors including deep purple, red to violet, magenta to purple, pink and pale lila...

Sieber agate is not a true agate but rather a glassy, dark blue-grey or green copper slag that formed during ancient copper smelting in Germany, sp...

Mica is a mineral name given to a group of minerals that are physically and chemically similar. They are all silicate minerals, known as sheet sil...

Discovered in Greenland in the late 1890's, hackmanite is named for Finnish geologist Victor Hackman. It is a rare occurrence to find gem-grade hac...

Heliodor is a yellow, greenish yellow, or golden-yellow color of the mineral beryl. The yellowish colors of heliodor are usually caused by small am...

Hypersthene is often categorized as enstatite or ferrosilite, but its identity is complicated. Pure enstatite contains no iron, and pure ferrosilit...

Glacierite, also known as Blue Ice Glacierite or Blue Ice Nakaurite, is a rare, newly discovered mineral from Indonesia that is an accidental bypro...

Biotite is a name used for a large group of black mica minerals that are commonly found in igneous and metamorphic rocks. These include annite, phl...

Thulite is the naturally occurring pink variety of the mineral Zoisite. It can range in color from pale pink to deep rose or even rusty red tones d...

Moonstone naturally occurs in a broad spectrum of colors, but is most commonly associated with white, gray and peach. It's soft chatoyancy is remin...

Garnets are a group of silicate minerals that have been used since the Bronze Age as gemstones and abrasives. All species of garnets possess simila...

Diopside is a calcium and magnesium silicate mineral. It is transparent or translucent, and can display a nearly emerald green color due to the pre...

Boulder Opal is a golden-brown to dark brown stone, displaying these colors in patterns of parallel bands. It is considered a precious Opal, and fo...

Diamond is a rare, naturally occurring mineral composed of pure carbon. Although most people think of diamonds as colorless, they actually occur i...