Riebeckites is valid Scrabble Word

Is riebeckites a scrabble word?
Official Scrabble Players Dictionary NO
Official Tournament and Club Word List NO
Collins Scrabble Words YES
Is riebeckites valid Words with Friends?
Words with Friends YES

Definitions for RIEBECKITES in dictionary:

Words related to RIEBECKITES

riebeckite18

Similar words containing RIEBECKITE without suffix s

riebeckite18
Find what other words can be done using letters: "riebeckites"
https://scrabble-word.com/finder/riebeckites
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