quar

Quar is a fictional mineral introduced in science fiction works and used in educational simulations to illustrate metamorphic processes and mineral identification. In these contexts, quar is described as a blue to teal silicate mineral with distinctive iridescent surfaces that arise from thin-film interference within its layered microstructure.

In terms of properties, quar is depicted as forming a monoclinic crystal system with occasional prismatic crystals up to several centimeters long. It has a hardness around 6.5–7 on the Mohs scale, a density about 3.2–3.6 g/cm3, and a refractive index near 1.70–1.75. Cleavage is typically considered poor, and the mineral may exhibit weak pleochroism depending on crystal orientation. The color and luster are often described as highly variable in fiction, but the iridescence is a recurring characteristic.

Occurrence and formation are tied to high-pressure, low-temperature metamorphism in subduction-like settings within the fictional world. In these narratives, quar crystallizes from calcium-, aluminum-, silicon-rich fluids during the blueschist to eclogite transition, commonly associated with ultramafic to felsic protoliths.

Extraction and processing are described in speculative contexts as labor-intensive, involving deep underground mining and subsequent purification to produce quar crystals or quarite ceramic precursors. Uses within stories include decorative jewelry, high-strength ceramic composites, and prototype energy-storage components, illustrating how novel minerals might influence technology.

Etymology of the name quar varies by author, but it is frequently presented as derived from a historical or constructed language element meaning light or shine. See also metamorphic geology, silicate minerals, fictional minerals in literature.