fel·site 
(fĕlsīt′)
(fĕlsīt′)n.
A fine-grained, light-colored igneous rock, composed chiefly of feldspar and quartz.
[FELS(PAR) + -ITE1.]
fel·sitic (-sĭtĭk) adj.
- impenitence
- impenitent
- impenitently
- imperative
- imperatively
- imperativeness
- imperator
- imperatorial
- imperceptibility
- imperceptible
- imperceptibleness
- imperceptibly
- imperceptive
- imperceptiveness
- imperceptivity
- impercipient
- imperfect
- imperfect fungus
- imperfection
- imperfective
- imperfectly
- imperfectness
- imperforate
- imperia
- imperial