Felsisk

Felsisk is a fictional mineral in fantasy literature and world-building guides. It is described as a silica-rich, glassy stone, typically pale yellow to pale green, with a translucent appearance. It is valued as a decorative material and for inlays.

Chemically, Felsisk is presented as silicon dioxide with trace aluminosilicates. Typical descriptions assign it Mohs hardness 6.5–7, density around 2.7 g/cm3, and a vitreous luster. Color variations arise from iron, titanium, or other trace elements.

It forms in pegmatitic veins within granitic plutons and in felsic volcanic contexts. It is commonly found with quartz, feldspar, and mica. Deposits are usually small but high-quality, making selective mining important.

Uses and culture: In-world, Felsisk is carved into seals, jewelry, and decorative panels. Some cultures attribute protective or magical properties to it, though these beliefs are lore rather than science. Production is typically organized by artisan guilds.

Etymology: The name derives from felsic rock roots and a fictional suffix common in the setting; it is not a real mineral.