Definitions

1. noun

A type of volcanic glass or obsidian, particularly one that is high in metal oxides, often with a distinctive greenish color.

“The geologist studied the felsophyre deposits to understand their geological history.”

2. noun

A type of glass or obsidian with a high concentration of metal oxides, often forming in volcanic regions.

“The museum displayed a collection of felsophyre samples from around the world.”