The text attempts to heighten the description of celestial luxury but invents a chemical and physical impossibility.
Surah 76:15-16:
"...And cups of crystal—crystal of silver, the measure of which they have determined precisely." (In Arabic: Qawareera min fiddah)
The Scientific Error:
The Arabic text describes vessels that are literally "glass/crystal made of metallic silver." Glass (an amorphous silicate structure) and silver (a transitional metallic element) are entirely distinct materials with mutually exclusive atomic properties. Metal cannot simultaneously be transparent, brittle silicate glass while remaining metal. This linguistic blending reveals a human author trying to sound profoundly poetic while violating the foundational laws of material science and chemistry.