SCAPOLITE
Calcium-rich meionite, and sodium-rich marialite form a series of minerals with the group name scapolite. The group occurs as prismatic crystals, and also in granular and massive habits. Scapolite varies, and may be colourless, white, grey, blueish, greenish, yellowish, brownish, pink or violet. It forms in igneous rocks that have been altered from their original basic composition, and in metamorphic rocks, such as high-grade schists and gneisses. Hardness: 5 1/2 - 6