Ibirliine

Ibirliine is a hypothetical mineral used in theoretical geology to explore mineralogical processes under metamorphic and hydrothermal conditions. It is described in several teaching examples and speculative models as a silicate-rich mineral with variable iron and magnesium content. The name ibirliine derives from the fictional Ibirli region, and it is often used in exercises that illustrate the effects of pressure, temperature, and chemical environment on mineral stability.

In hypothetical classifications, ibirliine is described as monoclinic or possibly triclinic in crystal symmetry, with a layered silicate-like framework that can accommodate substitutions between Fe2+, Mg2+, and Al3+. Its color ranges from olive to grayish-green, with a vitreous to pearly luster. Reported hardness is around 6 on the Mohs scale, and measured densities in models vary between 3.0 and 3.4 g/cm3. It is thought to occur in ultramafic to mafic rock systems, forming at high temperatures during regional metamorphism and at hydrothermal interfaces where silica activity is elevated. Common associations in these models include serpentine minerals, magnetite, and chromian spinel.

Because ibirliine is hypothetical, there are no established industrial applications or standards for its identification in real-world geology. It serves primarily as a teaching and conceptual tool for discussing mineral stability, phase diagrams, and geochemical modeling.