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Prehnite was the first mineral to be named after a person: its discoverer, Dutch Colonel Hendrik Von Prehn. Von Prehn discovered the stone in South Africa in 1774. Prehnite is...

Australian Green Opal is a variety of Common Opal which is a mixture of Opal and nontronite. Common Opal is generally opaque, without the play of color present in more...

Prehnite was the first mineral to be named after a person: its discoverer, Dutch Colonel Hendrik Von Prehn. Von Prehn discovered the stone in South Africa in 1774. Prehnite is...

Prehnite was the first mineral to be named after a person: its discoverer, Dutch Colonel Hendrik Von Prehn. Von Prehn discovered the stone in South Africa in 1774. Prehnite is...

Chrysocolla, a hydrous copper silicate, is often mistaken for turquoise due to its rich blues and blue-greens. It often also occurs with colors of rust, copper, black, white and reddish...

Chrysocolla, a hydrous copper silicate, is often mistaken for turquoise due to its rich blues and blue-greens. It often also occurs with colors of rust, copper, black, white and reddish...

Chrysocolla, a hydrous copper silicate, is often mistaken for turquoise due to its rich blues and blue-greens. It often also occurs with colors of rust, copper, black, white and reddish...

Chrysoprase is a bright apple green, translucent stone, whose color often caused ancient jewelers to confuse it with Emerald. A cryptocrystalline Chalcedony, its brilliant color comes from the presence of...

African Green Opal is a form of Common Opal, an opaque stone that does not display the play of color seen in more precious Opals. It does have the distinctive...

Unakite is a granite composed of pink Feldspar and Epidote, creating a beautiful blend of pink and green in mottled patterns. The colors in this stone can range from pistachio...

African Green Opal is a form of Common Opal, an opaque stone that does not display the play of color seen in more precious Opals. It does have the distinctive...

Lava is rock from the molten center of the earth, once spewed through fractures in the planetary crust or from a volcanic eruption. Once cooled, the resulting rock is dark...

Lava is rock from the molten center of the earth, once spewed through fractures in the planetary crust or from a volcanic eruption. Once cooled, the resulting rock is dark...