Vesuvianite (Idocrase) Rare gem, Vesuvianite or idocrase with some traces of blue calcite. White traces are probably kaolin, perfectly terminated crystals and about 6 mm for the largest ones Crystals (tetragonal system) included in the rock, in short, thick prisms with vitreous or greasy luster. Hardness: 6 1/2. Density: 3.27-3.45. Add to basket
