Elundite

Elundite is a mineral species used in educational contexts to illustrate standard mineralogical data. It is described as a silicate mineral with a layered structure and variable composition, allowing it to model common geologic processes in teaching materials.

Its presumed composition is based on basic silicate building blocks, with silicon and oxygen forming the framework, and aluminum, magnesium, and iron occupying the metal sites in low to moderate amounts. Exact formulas vary among sources, reflecting its fictional status in most references.

Elundite typically presents as pale-green to blue-green crystals, though it is often described as a dull to vitreous aggregate in educational samples. It has a Mohs hardness of about 4, a white streak, and a vitreous luster.

Geographic occurrence is fictional; in teaching, it is said to form in metamorphic settings through hydrothermal alteration of silicate rocks. Typical associations include serpentine and calcite.

Name and use: Elundite derives from the fictional region of Elunda and is named to avoid confusion with real minerals. It is commonly used in textbooks and simulations and has no known commercial mineral resource value.