Datuminas

Datuminas are a group of rare silicate minerals characterized by a hydrated aluminum silicate framework with trace iron and magnesium. They are notable for their pale green to colorless crystals and for emitting a weak blue fluorescence under ultraviolet light. The minerals were first described in the late 20th century and have since been the subject of limited but ongoing study in metamorphic geology.

The name Datuminas was proposed to reflect the minerals’ role in documenting metamorphic histories through mineralogical data. The type locality is the Kibara belt in Central Africa, where the first specimens were collected from high-grade schists adjacent to quartz veins. The holotype specimen is deposited in the National Museum of Natural History, where it is kept for reference and comparative studies.

Physical properties of Datuminas include a Mohs hardness around 6.5 to 7, a vitreous luster, and transparent to translucent crystals. They crystallize in the monoclinic system and typically form tabular to prismatic habits. Cleavage is imperfect, and the refractive indices are moderate, giving them a distinctive, subtle optical character under reflected light.

Occurrence and geology: Datuminas occur in regional metamorphic rocks, especially in quartz-rich schists and compact veins where hydrothermal processes have altered the surrounding minerals. They are commonly associated with garnet, staurolite, and muscovite, and they form under conditions of elevated temperature and pressure.

Use and research: Due to their rarity, Datuminas are mainly of interest to mineral collectors and researchers. Their photoluminescent properties and stable composition make them candidates for study in optical and crystallographic contexts, though practical applications remain speculative.