Zunyite: Gemstones Information

Zunyite is Al13Si5O20(OH,F)18Cl and forms fine transparent colourless or grey or pale brown tetrahedral or pseudo-octahedral crystals of the cubic system with hardness 7 and SG 2.87–2.90. The RI is 1.592–1.600. Some specimens may show a strong red fluorescence under UV. Zunyite occurs in highly aluminous shales and hydrothermally altered volcanic rocks.Large crystals are found in the Dome Rock Mountains,