HUGE Extremely Rare Polyhedral Agate - Brazil (1970s) Prehnite is a variation of

Prehnite is a variation of a silicate mineral that rarely forms individual crystals

relaxation

Considered a grounding stone

Chemical Formula: Ca3SO4Al2F8(OH)2 · 2H2O

Tooth Size: 5

HUGE Extremely Rare Polyhedral Agate - Brazil (1970s) Prehnite is a variation ofTo have an agate specimen similar to this in your collection is something special, to say the least. Most of these agates that have found their way on the market have either been gobbled up by private collectors or cut into many slices to maximize profit. Do not miss your chance at such a rare mineral specimen! Unlike many of the other specimens in our galleries, this piece has very defined crystal formations in the center! Size: 5. 3 x 5. 3 x 2. 1