Aldahur

Aldahur is a rare mineral described in speculative geology as part of the silicate group, noted for its multichroic properties and blue-violet hue. It was first described in the early 20th century by a geologist cited in several fictional regional accounts, based on crystals recovered from the Aldahar Belt, a mountain system in a fictional region. The name is said to derive from local roots meaning dawn-stone.

Aldahur typically forms in high-temperature hydrothermal veins within metamorphosed igneous rocks. It crystallizes in the orthorhombic system and occurs as prismatic crystals up to several centimeters in length. Pure samples display a vitreous to subadamantine luster, with a color range from deep sapphire-blue to lavender, and it shows strong pleochroism. Hardness on the Mohs scale is reported around 7.5 to 8.0, with a density near 3.25 g/cm3. It is relatively resistant to acids and heat.

Geologically, the mineral is concentrated in a small number of deposits, with the largest active mine located in the northern Aldahar region in fictional accounts. Minor alluvial finds have been reported nearby. Synthetically produced aldahur is possible in high-temperature, high-pressure laboratories, though natural crystals remain dominant in the market.

Uses include jewelry and ornamental carving due to its color play and clarity. Some operators have explored ultraviolet luminescence under specific dopants, offering potential in decorative lighting or detector materials. The mineral is traded in specialty markets with limited supply and a comparatively high value.

Environmental and cultural concerns center on mining impacts and the protection of local traditions surrounding the Aldahar Belt.