sandstone
sandstone:
1. tōfus or tōphus (generic term applied to various kinds of sandy, friable rock: according to Conington [Virg. G. 2, 244], a sort of volcanic sandstone: cf. Vitr. 2, 7, init.: sunt etiam alia genera plura, uti in Campania ruber et niger tophus): Plin. 17, 3, 4.
2. carbuncŭlus (a particular kind of sandy stone): cf. Vitr. 2, 7, extr.: nonnullis locis procreatur id genus arenae, quod dicitur carbunculus. (Kr. gives saxum arenaceum, but without authority: lapis arenarius occurs, Serv. Virg. G. 2, 348.)
1. tōfus or tōphus (generic term applied to various kinds of sandy, friable rock: according to Conington [Virg. G. 2, 244], a sort of volcanic sandstone: cf. Vitr. 2, 7, init.: sunt etiam alia genera plura, uti in Campania ruber et niger tophus): Plin. 17, 3, 4.
2. carbuncŭlus (a particular kind of sandy stone): cf. Vitr. 2, 7, extr.: nonnullis locis procreatur id genus arenae, quod dicitur carbunculus. (Kr. gives saxum arenaceum, but without authority: lapis arenarius occurs, Serv. Virg. G. 2, 348.)