One variety of this mineral has a shade known as Kashmir blue, and another variety has a shade called pigeon's blood.
Synthetic varieties of this mineral were made by Auguste Verneuil using the flame-fusion process. Asterism in this mineral is caused by the inclusion of rutile. One variety of this mineral has a shade known as Kashmir blue, and another variety has a shade called pigeon's blood. The material emery consists of magnetite and this mineral. Aluminum oxide occurs naturally in large deposits as this mineral, which has a value of nine on the Mohs scale of hardness. For 10 points, name this mineral whose transparent varieties, such as sapphire and ruby, are used as gems.
Synthetic varieties of this mineral were made by Auguste Verneuil using the flame-fusion process.
{corundum}