phlogopite: a brown form of mica consisting of hydrous silicate of potassium and magnesium and aluminum
mica: any of various minerals consisting of hydrous silicates of aluminum or potassium etc. that crystallize in forms that allow perfect cleavage into very thin leaves; used as dielectrics because of their resistance to electricity
glottis: the vocal apparatus of the larynx; the true vocal folds and the space between them where the voice tone is generated