fire obsidian (English, noun)
expansion: fire obsidian (countable and uncountable, plural fire obsidians)
Senses:
topics: chemistry
geography
geology
mineralogy
natural-sciences
physical-sciences
glosses: A rare variety of relatively clear volcanic glass that produces a vibrant color-reflectance caused by the inclusions of magnetite nanoparticles.
tags: countable
uncountable
Forms:
form: fire obsidians
tags: plural