1. Plural of mica; a group of silicate minerals that split into thin, transparent or translucent sheets and are used in electrical and thermal insulation.
Usage: Typically used in technical or scientific contexts; Mica is a mass noun, but 'micas' refers to multiple types or samples of mica

Examples

• The geologist identified several different micas in the rock sample.
• Micas are valued in the electronics industry for their insulating properties.
• The sparkle in the granite came from flakes of micas reflecting light.
• Industrial applications of micas include use in cosmetics and paints.
• Different micas have varying thermal and electrical resistance characteristics.