Composition: Beryllium aluminum silicate hydroxide
Nomenclature: Named from the Greek words "eu" meaning "well" and "klasis" meaning "breaking," a reference to the property of euclase to cleave (break along flat planes) easily.
Industrial Uses: Gemstones.
Additional Notes: Also referred to as euclasite.
Comoro Islands : Scott 930d : 375 francs : 1998
Euclase