A type of feldspar mineral with extremely fine, submicroscopic layers of alternating compositions that cannot be seen under an ordinary microscope.
From Greek 'kryptos' (hidden) + 'perthite' (a feldspar rock with visible layering). Geologists named it for its hidden structure, distinguishing it from regular perthite which shows visible banding.
Cryptoperthites are hidden geological puzzles—the layers are so incredibly thin that early geologists couldn't even see them existed, only discovering them after electron microscopes were invented!
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