8 words for ACGIOSTX 1-letter words

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1 letter (8)

a c g i o s t x
Form of quartz with coloured bands
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Hint 1 meaning
A semipellucid, uncrystallized variety of quartz, presenting various tints in the same specimen. Its colors are delicately arranged in stripes or bands, or blended in clouds.
Hint 2 anagram
GETAA
Hint 3 another clue
CERTAIN BRAIN SIZE
6 +1

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