baaspinge

Baaspinge is a rare mineral described in contemporary mineralogy literature. It is a barium-rich silicate that crystallizes in the hexagonal system and forms prismatic crystals that can reach several centimeters in length. The name combines the regional toponym Baasp with the local suffix -spinge, interpreted as a mark of shine in the area where the mineral was first identified.

Composition and structure are typically given as a boron- or silicon-rich barium silicate with traces of iron, manganese, and titanium. The crystal framework consists of SiO4 tetrahedra arranged in a three-dimensional network, with large interstitial sites occupied by barium ions. This arrangement contributes to the mineral’s notable optical anisotropy and color variation.

Occurrence and geology: Baaspinge forms in high-grade metamorphic rocks, particularly in granulite to eclogite facies environments, where dehydration and partial melting occur under elevated temperature and pressure. It is often found in association with garnet, kyanite, and cordierite and is typically isolated to localized pockets within metamorphic belts.

Physical properties and color: The mineral color spans from olive-green to pale amber, with strong pleochroism in many samples. It has a vitreous luster, a Mohs hardness of about 6–6.5, and a specific gravity near 3.4–3.8. Crystal habit is predominantly prismatic, with well-formed terminations in some specimens.

Uses and significance: Due to its rarity and aesthetic appeal, baaspinge is primarily of interest to collectors and gem enthusiasts. It is seldom mined commercially, and legal or environmental protections can limit excavations. In research contexts, baaspinge has been studied for crystallography, formation conditions, and potential optical applications, though it has no broad industrial use.

See also: List of minerals, Silicate minerals, Barium minerals.