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A basic or basalt glass
Answer for the clue "A basic or basalt glass ", 9 letters:
tachylite
Word definitions for tachylite in dictionaries
Wikipedia
Word definitions in Wikipedia
Tachylite (also spelled tachylyte) is a vitreous form of basaltic volcanic glass . This "glass" is formed naturally by the rapid cooling of molten basalt. It is a basic type of igneous rock that is decomposable by acids and readily fusible. The color is ...
Wiktionary
Word definitions in Wiktionary
n. (alternative form of tachylyte English)
WordNet
Word definitions in WordNet
n. a basic or basalt glass