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Prehnite

Prehnite is a relatively rare mineral that is typically found in shades of green, yellow, or white. It was first discovered in South Africa in the late 18th century and was named after Colonel Hendrik Von Prehn, a Dutch mineralogist who was instrumental in its discovery.

Prehnite is composed of calcium, aluminum, and silicon, and is typically found in volcanic rocks and hydrothermal veins. It is often associated with other minerals such as apophyllite, zeolites, and calcite.