eruptive rock

eruptive rock

[ə′rəp·tiv ′räk]
(petrology)
Rock formed from a volcanic eruption.
Igneous rock that reaches the earth's surface in a molten condition.
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References in periodicals archive ?
This consultation concerns the supply and possibly transport eruptive rocks for the needs of the 5 Departmental Agencies of the layout of the Charente.
The nearest alternative source would have been in the Muntii Gurghiului of Romania, where Roman quarries in eruptive rocks have been reported (Wollman 1974), but these are in Dacia rather than Pannonia and at the time of Diocletian would have lain beyond the confines of the empire.