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Selenite is a crystal formed from the mineral gypsum, which comes in many forms and color variations, but has been used historically to describe th...

Selenite is a crystal formed from the mineral gypsum, which comes in many forms and color variations, but has been used historically to describe th...

Sapphires are precious gemstones, but unlike rubies, they come in a rainbow of colors besides red! They are all varieties of the mineral corundum,...

Petrified Wood Agate is formed from the petrifaction process of primeval trees over the course of many years. Petrification occurs when the wood is...

An iron oxide-hydroxide mineral, Lepidocrocite forms when iron-containing substances rust underwater. It is commonly found in the weathering of pri...

Essentially a volcanic glass, Obsidian ranges in color from opaque black, to green, brown, mahogany, black with rainbow colors, black with snowflak...

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, th...