Kahjurite

Kahjurite is a rare silicate mineral described from hydrothermal vein deposits in granitic pegmatites. It was first identified in the late 20th century by mineralogists studying Fe- and Al-rich zonation in late-stage fluids. The name Kahjurite honors the lead discoverer of the type locality.

Composition and structure

Kahjurite has a silicate framework with significant occupancy by iron and aluminum cations, with magnesium and calcium substitutions common in solid solutions. The exact chemical formula varies between samples, reflecting cation substitutions within the crystal structure. Crystallography places it in the monoclinic system, with crystals typically prismatic or tabular and elongated in one dimension. The mineral commonly exhibits a greenish to brownish color, a vitreous luster, and a pale streak. Hardness is rated around 5.5–6 on the Mohs scale, and density ranges roughly from 3.9 to 4.2 g/cm3. Cleavage is generally poor or indistinct.

Occurrence and paragenesis

Kahjurite occurs in hydrothermal veins where late-stage fluids interact with iron- and aluminum-rich rocks. It is frequently associated with quartz, magnetite, chlorite, and other silicate minerals. The mineral forms under relatively low to moderate temperatures during fluid cooling, with its stability linked to the chemical environment of the host rock.

Distribution and status

Kahjurite remains a rare constituent of mineral assemblages worldwide, known mainly from a limited number of localities. It is of interest to collectors and researchers as a diagnostic indicator of specific hydrothermal conditions and as a subject for studies of cation substitution in silicates.

Uses and significance

Kahjurite has no commercial ore value but contributes to the understanding of mineralogy, hydrothermal processes, and solid-solution behavior in silicate systems. It serves as a reference point for identifying Fe- and Al-rich silicate phases in related rocks.