流りゅう紋もん岩がん

りゅ

う

も

ん

が

ん

Meanings

1

noun

rhyolite

A fine-grained volcanic rock, often with flow banding; the Japanese name literally means 'flow-pattern rock'.

current, a sink, flow

紋family crest, figures

岩boulder, rock, cliff

安あん山ざん岩がん
Andesite, another volcanic rock with intermediate silica content, while rhyolite is high in silica.
玄げん武ぶ岩がん
Basalt, a dark volcanic rock with low silica content, contrasting with the light-colored, silica-rich rhyolite.

From 流 (flow) + 紋 (pattern) + 岩 (rock), referring to the flow banding often seen in this rock type.