A pale yellow or white mineral containing lithium, aluminum, phosphorus, and fluorine, often used as a source of lithium for batteries and medications.
From Greek 'amblys' (dull) + 'gonia' (angle), named in the 1820s because its crystal angles appeared obtuse or blunt under magnification. The term reflects how early mineralogists named stones based on their visual properties.
Amblygonite became economically important in the 20th century when lithium demand skyrocketed—today it's quietly powering your phone's battery. The word's Greek roots show how scientists 200 years ago were literally describing what they saw with magnifying glasses before understanding the atomic structure.
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