Prehnite is a green mineral that can range from pale to cloudy green.
It often forms in masses or botryoidal (grape-like) clusters and may contain distinctive inclusions.
Inclusions in prehnite are often epidote, but tourmaline and amphibole are also common.
Prehnite forms in cavities within volcanic rocks, often alongside minerals like quartz and zeolites, which are known for their ability to absorb water and other molecules.
Prehnite, which is mainly used as a gemstone, is prized for its attractive green colour and smooth texture.
Prehnite crystals (tumbled stones) are popular with collectors and can be used for their metaphysical healing properties.
Pietersite
