Hardness: 6-6.5 A Silicate{ Tectosilicates, Feldspar group, K- Feldspar} A variety of Microline. Insoluble in acids except hydrofluoric acid. Found in granite pegmatites and metamorphic rocks. Is blue -green in colour, often with white stripes of albite in it. Metaphysical Properties: Corresponding Astrological Signs: Virgo