ҮНЭТ ЭРДЭНИЙН ЧУЛУУ | Natural history museum of Mongolia
This gemstone is made of alumina (Al 2 O 3) is a grade 1 gemstone. Available in translucent, blue-pink to indigo-blue. It is one of the hardest gemstones with a hardness of 9, similar to ruby, and is found in syenite, pegmatite, and high-grade metamorphic rocks of the same origin.