A feldspathic mineral or a type of feldspar lacking the ordered crystal structure of true orthoclase.
From Greek 'an-' (without) + 'orthos' (correct/straight) + '-ose' (mineral suffix). Used in mineralogy to describe feldspars with atypical crystalline arrangements.
The naming of minerals often captures the order (or lack of it) in their atomic structure—'anorthose' is literally calling out a mineral for being 'not right,' which is exactly how scientists think about crystal structures.
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