Roquesite is a mineral belonging to the pyrite group and has the chemical formula CuInS₂. It is a rare sulfide mineral that typically occurs in veins associated with hydrothermal ore deposits. Named after its discovery location at the Roques mine in Ariège, France, Roquesite is an important source of indium, which is used in various technological applications.
Physically, Roquesite crystals are usually found in granular or massive forms, but can also be encountered as small prismatic or tabular crystals. Its color ranges from silver-gray to metallic yellow, with a bright metallic luster. The mineral is relatively soft, with a Mohs hardness rating of 3.5 to 4, and its specific gravity varies between 4.6 to 4.8.
One characteristic feature of Roquesite is its rich indium content, which contributes to its economic significance. Indium is primarily utilized in electronic devices, including liquid crystal displays (LCDs) and touchscreens, as well as in solar panels and semiconductor technology.
Geologically, Roquesite is formed in hydrothermal systems associated with copper and tin deposits. It occurs as a secondary mineral within these ore deposits, owing to the precipitation of copper and indium-rich fluids. Roquesite is often found alongside other minerals such as pyrite, chalcopyrite, sphalerite, and cassiterite.
Overall, Roquesite is a valuable mineral due to its indium content and its association with other economically significant minerals. Its unique properties make it a sought-after resource in various industrial sectors, particularly in the advancement of electronic and energy technologies.
