Pseudofulgurita El Rosario: Un agregado vítreo exótico en el Estado de Hidalgo

Luis Enrique Ortiz Hernández^1,2 e Israel Hernández Pérez³

¹Consejo de Recursos Minerales, Gerencia de Investigación Aplicada. Blv. Felipe Ángeles s/n km 93.5 Col. Venta Prieta, C.P. 42080, Pachuca, Hgo.
²Sección de Estudios de Posgrado e Investigación IPN, ESIA-Unidad Zacatenco. Ed. No. 12, 3er. Piso, Apdo. Postal 75-136, México, D.F.
³Consejo de Recursos Minerales, Gerencia de Geofísica. Blv. Felipe Ángeles s/n km 93.5 Col Venta Prieta, C.P. 42080, Pachuca, Hgo.

 Abstract

El Rosario pseudofulgurita (6.475 kg) and other small vitreous fragments, were recovered May 21st, 1995, in Ejido El Rosario, near Tepatepec, Hidalgo state (99" 05' N and 20° 15' S). A brecciated and tubular structure formed by a green siliceous and aliminous glass with n> 1.537 and a specitie gravíty of 2.548 are the characteristics of the biggest fragment. It ¡nclude gray metalic spheres of silicides, and rare clinopyroxene microcrysts. In the scoriaceous part surrounding the glass, were identified silica polymorphs (quartz, tridimite and cristobalite), plagioclase, portlandite, calcite and calcic hydroxides.

Whole-rock analysis of both glassy and scoriaceous phases show SiO₂ and Al₂O₃ enrichment, and Na₂ K₂O₁, CaO, FeO y TiO₂ contents that represent the whole chemical composition of the argillaceous and silty precursor soil. El Rosario pseudofulgurite was produced when a broken high-power line (13,000 volts) fell to the ground.

Keywords: Pseudofulgurite. mineralogical characterization, chemical composition, Hidalgo state, Mexico.