Liroconite is a complex mineral: Hydrated copper aluminium arsenate hydroxide, with the formula Cu O mineral, colored bright blue to green, often associated with malachite , azurite. It is quite soft, with a Mohs hardness of 2 - 2.5, and has a specific gravity of 2.9 - 3.0.
It was first identified in 1825 in the tin and copper mines of Devon and Cornwall, England. Although it remains quite rare it has subsequently been identified in a variety of locations including France, New Jersey
The type locality for Liroconite is Wheal Gorland in the United Kingdom.
It occurs as a secondary mineral in copper deposits in association with olivenite , clinoclase, malachite