tolermur

Tolermur is a fictional mineral commonly used in worldbuilding, science fiction, and fantasy settings. It is described as a dense, iridescent silicate that forms under high-temperature metamorphic conditions. As a non-real mineral, there is no single canonical description; depictions vary by author, but tolermur is generally portrayed as rare and valuable, with properties enabling unusual technological or magical effects in its fictional universes.

In most in-world accounts, tolermur crystallizes in a crystalline habit that includes prismatic or blocky forms, with a surface that shows vivid sheen or color-shifting iridescence. Commonly cited physical properties include a hardness around 7 on the Mohs scale, a high refractive index, and a dense, durable structure. Its luster ranges from adamantine to submetallic, and cleavage is weak or absent, making it difficult to break. The mineral is typically colorless to pale green or blue in ordinary light, with color effects becoming pronounced when viewed in reflected light.

Tolermur is said to occur in ultrametamorphic belts and is often associated with garnet, spinel, or cordierite in the fiction. Type localities and origin stories vary, but many fictional geologies place tolermur in the Toleren region or mountains, which some authors credit for the name.

In cultural contexts, tolermur is valued for jewelry and for use in advanced devices in various works. It is sometimes described as having special conductive or energetic properties, making it a sought-after component for arcane artifacts or sci-fi energy systems. Because tolermur is a construct of fiction, real-world science has no verified analogue.