Prehnite
Prehnite (also known as Grapestone or Grape Stone) was the first mineral to be named after someone. H. Von Prehn discovering Prehnite in 1774 at the Cape of Good Hope in Africa. Prehnite is often a waxy bright green crystal, resistant to pressures and scratching. It is composed of aluminum, calcium and silicon.
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Prehnite Chip Beads
Prehnite Gemstone Chip Beads 5x8mm (~160pce Strand) ~80cm Strand.$4.95