670 Carat Natural Botryoidal Bubbly Green Prehnite Balls Cluster Mineral Gemstone Crystal Geode Rough Specimen - Mali, Africa

All our minerals and crystals are carefully measured with digital measuring instruments that provide the high accuracy of numbers/values!

• You will receive exactly this Green Prehnite Cluster - 67mm x 64mm x 37mm / 2 5/8 x 2 1/2 x 1 7/16 Inches; 134g / 4.7 oz / 670 Carat (see photo, the photos are taken under bright light, stand not included)!
• Prehnite is a translucent to transparent gem-quality hydrated calcium aluminum silicate. It was the first mineral to be named after an individual, and it was also the first mineral to be described from South Africa. Named in 1788 by Abraham Gottlieb Werner in honor of the Dutch Colonel, Hendrik von/van Prehn, who is credited with discovering the mineral in 1774 at the Cape of Good Hope in South Africa.
• Prehnite forms in both odd and distinct formation habits. It most often occurs as rounded or bubbly crystal masses, and commonly forms odd-shaped epimorphs after Anhydrite, Glauberite, and Laumontite. These epimorphs are remarkable for having hollow centers of a dissolved early-stage mineral. Elongated Prehnite formations are almost always rounded at the head and resemble fingers, and they are affectionately called "Prehnite Fingers" by collectors.
• Chemical Formula: Ca2Al2Si3O12(OH); Color: Light green, dark green, mint-green, yellowish-green, brownish-green, and bluish-green. Rarely brown, yellow, orange, pink, gray, white, or colorless. Hardness: 6 - 6.5; Specific Gravity: 2.8 - 3.0.
• (The above information is provided solely for informational purpose. Kindly note that all stones are offered for decorative purposes only. Please, handle your stones with great care, do not grind or crumble them, do not dip or add them into your food or drink, do not use any parts of them in any elixirs, potions, lotions etc. Always make sure you wash your hands before and after working with your crystals.)