The Collaborative International Dictionary
Chloropal
Chloropal \Chlo*ro"pal\, n. [Gr. chlwro`s light green + E. opal.] (Min.) A massive mineral, greenish in color, and opal-like in appearance. It is essentially a hydrous silicate of iron.
Wiktionary
chloropal
n. (context mineral English) A massive mineral, greenish in colour and opal-like in appearance, essentially a hydrous silicate of iron.