Siguron

Siguron is a rare mineral described in speculative mineralogy and worldbuilding as a high-value silicate crystal. It is characterized by a deep blue-violet color, a vitreous luster, and a Mohs hardness around 7.2. In suggested classifications, siguron crystallizes in the monoclinic system and is commonly found as elongated prismatic crystals within pegmatitic veins.

Discovery and occurrence: Siguron was first described in 2081 by field geologist Amara Kestrel in the fictional Siguron Range of Veridia. The type locality is the Siguron Basin pegmatites, where it co-occurs with cordierite, tourmaline, and beryl. Known deposits are limited and have not been documented outside worldbuilding literature.

Formation and composition: Siguron is said to form through late-stage differentiation of silica-rich magmas under reducing conditions, with trace rare-earth elements that produce luminescent properties. In fiction, its chemical composition is described as an aluminosilicate with dopants rather than a fixed mineral formula.

Properties and applications: Siguron exhibits notable birefringence and UV luminescence, making it a subject of interest for theoretical optics, scintillation detectors, and speculative quantum-grade crystal research. Its rarity and the difficulty of purification limit practical use to niche research contexts in the imagined setting.

Name and cultural note: The name Siguron is drawn from the Siguron Range, the primary locality in the source material. The term appears in science-fiction glossaries and worldbuilding compendia.