Portal:Minerals/Did you know/15

Leonite perched on a matrix of halite

• ... that leonite (pictured) has been found on Mars?
• ...that crystals of Paulingite, a rare zeolite mineral found in vesicles in the basaltic rocks from the Columbia River, form a perfect clear rhombic dodecahedron?
• ... that abernathyite is both fluorescent and radioactive and is named for the mine operator who discovered it?