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Meaning of keystoneite | Babel Free

Noun CEFR C1

Definitions

A hexagonal-dipyramidal mineral containing hydrogen, iron, magnesium, nickel, oxygen, and tellurium.

CEFR level

C1

Advanced
This word is part of the CEFR C1 vocabulary — advanced level.

See also

Keystoner Keystones keystore keystream keystring keystrip