extrusive rock

Scope note: Igneous rock solidified on or near the surface after being ejected explosively or extruded as lava, as contrasted with intrusive rock; characteristically finely crystalline or glassy.

BT [igneous rock by origin]

300011246

extrusive rock

NT10 300011181 dacite
NT10 300011211 rhyolite [+~]
- NT11 quartz porphyry [+~]
  - NT12 elvan
NT10 300011249 lava
NT10 300011253 pyroclastic rock [+~]
- NT11 trass
- NT11 tuff [+~]
  - NT12 peperino [+~]
    - NT13 sperone
  - NT12 santorin
  - NT12 Neapolitan yellow tuff
- NT11 volcanic glass [+~]
  - NT12 pumice (volcanic rock) [+~]
    - NT13 tezontle
  - NT12 obsidian [+~]
    - NT13 marekanite
  - NT12 perlite
  - NT12 tachylite
  - NT12 pumice (pigment)

RT intrusive rock

Castellano roca volcánica
Català roca volcànica

Date of creation: 23-Jun-2025

Accepted term: 23-Jun-2025