Microscopic view of different groundmass textures in rocks
By Yellowstone Volcano Observatory
May 2024 (approx.)
Detailed Description
Microscopic view of different groundmass textures in rocks. On the left, this groundmass is a good choice for argon dating, as it consists of abundant interconnected crystals. On the right, the groundmass consists predominantly of glass (black because it does not transmit cross-polarized light) and is a poor choice for argon dating. Photos by Andrew Calvert, 2024.
Sources/Usage
Public Domain.