Langite on Matrix | blue crystal, rare mineral specimen from IrelandLangite from Ireland is a rare and attractive copper sulfate hydroxide mineral typically recognized for its soft, sky blue to turquoise coloration and silky, fibrous to platy crystal habit. It most commonly forms as delicate crusts or radiating aggregates in the oxidized zones of copper bearing sulfide deposits, often associated with minerals such as brochantite, malachite, and azurite. Irish occurrences are not among the worlds most prolific, which