Prehnite
“Translucent green grape clusters”
Prehnite is a calcium aluminum silicate mineral that typically forms botryoidal (grape-like) clusters in a distinctive pale green to yellow-green color. It was the first mineral to be named after a person — Colonel Hendrik Von Prehn, who brought specimens from South Africa to Europe in 1788.
calcium aluminum silicate hydroxide (Ca₂Al(AlSi₃O₁₀)(OH)₂)
Brandberg (Namibia), Northern New Jersey (USA), Pune region (India), Mali, Malmberget (Sweden), New South Wales (Australia)
6-6.5
Prehnite holds the distinction of being the very first mineral named after a person in recorded history, setting a naming tradition that continues to this day.
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