Olivenite is a mineral that belongs to the arsenate mineral group. It is a rare and distinctive copper-arsenate mineral that typically occurs in the oxidized zone of copper-rich ore deposits. The mineral's name is derived from its olive-green color, which is one of its most distinguishing features. Olivenite has a chemical formula of Cu2(AsO4)(OH), which indicates its composition of copper, arsenic, oxygen, and hydroxide ions.
Physically, olivenite is characterized by its prismatic or acicular crystal habit, which often forms fibrous or granular aggregates. It has a vitreous or somewhat resinous luster, and its green color can vary from a pale olive to a deeper, more intense green hue. Olivenite exhibits a varied hardness level, ranging from 3 to 3.5 on the Mohs scale, making it relatively soft.
This mineral is found in various locations around the world, such as Germany, France, Scotland, Chile, Namibia, and the United States. It is commonly associated with other copper minerals, such as malachite and azurite, as well as other arsenate minerals.
Due to its vibrant color and rarity, olivenite is highly sought after by mineral collectors. Its eye-catching appearance, combined with its characteristic green hue, makes it an attractive addition to mineral collections. However, it is important to handle olivenite with care as it contains arsenic, which can be toxic if ingested or inhaled.
