In geology or mineralogy, describing a material that has an uncertain or unclear crystalline structure; crystallinity that is questionable or difficult to determine.
From Latin 'dubius' (doubtful) combined with 'crystalline' (having the structure of crystals). A technical term created by combining established scientific vocabulary to describe ambiguous mineral properties.
Geologists use this term when they're looking at rocks under a microscope and can't quite tell if something *is* crystalline or just looks crystalline—it's basically admitting uncertainty in a very precise, scientific way.
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