R878

Sample ID R878 • Cabinet B

Rhyolite "thunder egg"

9cm W x 5.9cm H x 4.2cm D • 238g
Sample TypeRockRock QualityIgneousRock TypeExtrusive
CompositionFelsicTextureColor IndexReddish
Clast SizeAcid ReactionMohs Hardness 7

Rough light and dark exterior, polished smooth glassy reddish brown interior sphere with white at the center.