HOURGLASS MATERIAL Crossword Clue

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Crossword Puzzle Infos
The term 'hourglass material' is often used to refer to SAND, which is a granular material composed of finely divided rock and mineral particles. SAND is usually found in the form of quartz, but can also be made up of other minerals such as feldspar, mica, and olivine. SAND is an important component of many construction materials, and is also used in the manufacture of glass and ceramics.
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