The quality of resembling glass, including transparency, smoothness, or brittleness.
From 'glasslike' (adjective) + the suffix '-ness' (forming abstract nouns of quality). This nested construction (glass → glasslike → glasslikeness) shows how English builds increasingly specific descriptors.
The glasslikeness of certain minerals confused early geologists—they categorized obsidian (volcanic glass) as a type of mineral rather than recognizing it was amorphous and non-crystalline, a debate that shaped how we understand material classification.
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