Afghanite is a rare sodium, calcium, aluminium and sulphate silicate. This mineral crystallises in the trapezoidal system and is generally found in the form of blue prismatic crystals, often associated with other minerals such as lazurite, sodalite and pyrite. Afghanite crystals are prized for their beautiful intense blue colour and transparency. They are often used in jewellery and are also sought after by mineral collectors for their rarity and beauty.