Potential answers for "Mineral in glassmaking"

⭐⭐⭐⭐ FELDSPAR
⭐⭐⭐ SILICA
⭐⭐ STHELENS
⭐⭐ HELENS
⭐⭐ FRIT
⭐⭐ POTASH
⭐⭐ SAND
⭐⭐ FIRINGS

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