M679 - Nice ruby specimens from Mysore, India.

Ray got a shipment of over 200 of these pretty Indian Rubies in Sept  and he got such a good deal he has lowered the prices!

Corundum is a crystalline form of aluminum oxide with traces of iron, titanium and chromium. Red corundum crystals are called Ruby, while all other colors are called sapphire. These crystals are not considered gem quality, although they can be cut into cabochons and some my display a "star" pattern when polished.

Due to corundum's hardness, 9.0 on the Mohs scale, it can scratch almost every other mineral. It is commonly used as an abrasive, on everything from sandpaper to grinding wheels. Corundum occurs as a mineral in mica schist, gneiss, and some marbles in metamorphic rocks. It can also occur in igneous rocks. Hexagonal crystal system.

Corundum is the second hardest natural mineral known to science. The hardest mineral, diamond, is still four times harder than corundum. The color of corundum can vary greatly. The color can be white or colorless, blue, red, yellow, green brown, purple, and pink. Sapphire is the blue variety of corundum. The translucent varieties of corundum are often used as a precious gemstone.

8-sizes available.