tepkides
Tepkides are a term used in geology to describe a class of mineral-like particles embedded in volcanic tephra deposits. They are typically glassy or microcrystalline and may host small mineral inclusions. Tepkides form as fragments of eruptive glass rapidly quenched in the eruption column or on the ground, with secondary alteration that can lead to limited crystallization.
Etymology: The name derives from tephra, the volcanic ejecta, with the suffix -kide used in mineral nomenclature
Occurrence: Tepkides have been reported in tephra-rich deposits worldwide, especially in pyroclastic flows, ash layers, and
Formation and structure: They originate from molten fragments that cool rapidly to a glassy state; subsequent
Physical properties: Tepkides are usually translucent to opaque, colorless to brown, with a glassy luster. The
Classification and status: Tepkides are not universally recognized as formal mineral species in major databases. They