The beautiful prehnite gemstone cabochon with inclusions shown here is 21mm long.
Prehnite contains calcium and aluminium. It is the first mineral to be named after someone, and was initially discovered in 1789 in Haslach, Harzburg and Oberstein, Germany. It was named for Colonel Hendrik Von Prehn (1733–1785), commander of the military forces of the Dutch colony at the Cape of Good Hope from 1768 to 1780.
Prehnite is thought to be a protective stone. It is believed to be helpful in the healing of gout, anemia and kidney problems, and in toxin removal, stimulating the metabolism as well as regenerating the body.
I used this cabochon to create this custom piece: