How many letters does the top answer for “a popular name for mica, especially when in thin sheets.” have?

The most common answer is isinglass (9 letters).

Crossword clue: a popular name for mica, especially when in thin sheets.

1 answer found in Letterora's clue database (Wikidata facts, Open Trivia DB, WordNet and Webster definitions — all licensed sources).

isinglass 9 letters web-def

any of various minerals consisting of hydrous silicates of aluminum or potassium etc. that crystallize in forms that all