Volcanic bomb
Rock
Also called Lava bomb, Spindle bomb, and Bread-crust bomb
About it
A blob of lava over 64 mm across, thrown from a vent and shaped in flight: often spindle-shaped with twisted ends, or with a cracked bread-crust skin. Collected from cinder cones in Arizona, Hawaii, and the Eifel, Germany.
- Type
- Rock (igneous)
- Group
- Igneous (pyroclastic)
- Lustre
- dull
- Colours
- black, dark grey, red-brown
- Transparency
- opaque
Typical values: real specimens vary. For more, see mindat.org.