👉 Dungannonite is a type of mineral that is commonly found in the Northern Hemisphere. It is a blue-green to greenish-blue crystal with a hardness of about 4-5 on the Mohs scale and has a refractive index of 1.62. The name "dungannonite" comes from the Irish town of Dungannon, which is known for its rich mining industry. This mineral was first described in 1890 by German geologist Hans L