Sentence:  Do you enjoy the amber glow seen through the isinglass window of a wood stove? ... <WSD>"Muscovite</WSD>" (colorless, white, or pale red or green) mica is also commonnb...; it was named for "Moskva" (Moscow), where much of Europe's mica was mined. Isinglass, mentioned above, consists of thin, transparent sheets of <WSD>muscovite</WSD>. 
Meaning of the word marked with <WSD> tags:  A pale brown mineral of the mica group, being a basic potassium aluminosilicate with the chemical formula KAl<sub>2</sub>(Si<sub>3</sub>Al)O<sub>10</sub>(OH,F)<sub>2</sub>; used as an electrical insulator etc.