Kelsenin
Kelsenin is a fictional mineral used in geology education to illustrate concepts of mineral classification, crystallography, and chemical substitution in silicate networks. In most teaching formulations, Kelsenin is described as a blue monoclinic aluminosilicate with a layered tetrahedral framework and moderate hardness. It is not a naturally occurring mineral; rather, it appears in textbooks and classroom demonstrations as a hypothetical example to explore structure–property relationships.
Etymology and naming: The mineral is named in honor of the fictional mineralogist Dr. Kelsen, who is
Educational role: Kelsenin serves as a controlled model for teaching crystal systems, coordination, cleavage, and optical