Fukalite, Spurrite, Parasibirskite, and Oyelite originate from the Fuka Mine in Takahashi, Japan, a locality renowned for rare silicate phases in hydrothermal veins. The specimens feature mineral aggregates and intergrowths directly on matrix, reflecting the site’s characteristic formation environment.
Fukalite is an aluminosilicate, Spurrite a calcium-aluminosilicate, Parasibirskite a titanium phosphate, and Oyelite a complex iron-manganese silicate. This uncommon assemblage illustrates the geochemical diversity and variable conditions between metamorphic and hydrothermal systems.
Collectors value this selection for its well-documented provenance and authentic matrix relationships. The mineral aggregates are abundantly distributed on matrix and offer an attractive display in cabinets or as reference material for teaching and research collections.