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#WordOfTheDay

botryoidal

/ˌbɒtrɪˈɔɪd(ə)l/
adjective
(chiefly of minerals)
having a shape reminiscent of a cluster of grapes.

Origin
Late 18th century: from Greek botruoeidēs (from botrus ‘bunch of grapes’) + -al.

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The geode cracked open to reveal a bunch of botryoidal agate crystals looking like a cluster of grapes. I'm guessing that might be the origin of the shooter marble known as the "aggie" (which early on was actually made from agate mineral).