The story
Named after Dutch colonial governor of Cape of Good Hope Hendrik van Prehn in 1788, Dutch colonial governor. This was the first mineral to be named after a person.
Etymology from Wiktionary, CC BY-SA 4.0.
prehnite
Today it means: A mineral, a basic calcium, aluminium and iron aluminosilicate, which occurs in stalactitic aggregates or curved crystals, Ca₂Al₂Si₃O₁₀(OH)₂. Full definition →