It is almost pure silica (around 98%) with very few impurities

This specimen is great as teaching tools in the home or in the classroom

Product ID: HLGY12022  (Appraised at $ 720

Weight: 245

Color: Apple Green

Prehnite Crystal Cluster | 82 grams | Mumbai, India Martian It is almost pure silicaPrehnite can form prismatic, tabular, or pyramidal crystals, but usually occurs in botryoidal, reniform, stalactitic, granular, or compact habits. It is usually green in colour, but may be white, colourless, yellow, or gray. It has a colourless streak. Prehnite is transparent to translucent, with a vitreous to pearly luster. It forms in cavities in basaltic lavas. This spectacular blue green specimen will be a start in your collection. Prehnite is