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tephrite
Tephrite is a highly specialized term used almost exclusively within the fields of petrology and volcanology. It describes a specific chemical composition of volcanic rock, distinguishing it from other alkaline rocks like basanite or phonolite based on the precise ratio of feldspars and the absence of certain minerals.
Because it refers to a specific category of geological material, it is treated as an uncountable mass noun. One does not typically refer to "a tephrite" or "tephrites" unless referring to distinct types or samples of the rock in a technical laboratory context.