korundia

Korundia is a rare aluminum oxide mineral whose crystal structure is closely related to corundum. It forms in high-temperature, high-pressure environments and is valued for its hardness and optical properties. The mineral exhibits a broad color range, from blue and red to colorless, depending on trace elements such as chromium, titanium, iron, and vanadium.

Korundia was first described by mineralogists studying rocks of the Korundian belt in the fictional world; the name reflects both its relationship to corundum and the region of discovery.

Korundia crystallizes in the hexagonal system, typically forming prismatic crystals. It has a hardness of about 9 on the Mohs scale and a high refractive index, giving it a strong luster when cut. Impurities produce a range of colors and may cause pleochroism.

Occurrence and formation: Korundia occurs as an accessory mineral in metamorphic and igneous rocks, formed during regional metamorphism of aluminum-rich rocks or during high-temperature crystallization from silica-alumina magmas. It is commonly associated with spinel, corundum, and chrysoberyl.

Uses and significance: Gem-quality korundia crystals are used in jewelry, while industrial-grade material serves as an abrasive and as a component in high-temperature ceramics. In the fictional setting, korundia is researched for potential optical and electronic applications.