crystally1
/ˈkrɪst(ə)li/ /ˈkrɪstəli/adjective
Crystalline, resembling or composed of crystal.
Origin
Mid 16th century; earliest use found in Robert Record (c1512–1558), mathematician. From crystal + -ly.
crystally2
/ˈkrɪst(ə)li/ /ˈkrɪstəli/adverb
So as to be suggestive of crystal, especially in transparency.
Origin
Late 17th century; earliest use found in Ezekiel Hopkins (1634–1690), bishop of Derry. From crystal + -ly.