Rubiinit

Rubiinit is a term that has appeared in mineralogical literature to refer to a ruby-rich phase or variety encountered in certain rocks. It is not currently recognized as a distinct mineral species by major reference databases such as Mindat or the International Mineralogical Association, and its usage has varied across publications.

The name rubiinit derives from the word ruby and the mineral-name suffix -ite, reflecting its reported association with ruby (corundum) in some contexts.

Descriptions of rubiinit's composition are inconsistent. Some accounts treat it as an aluminum- and silicon-rich silicate phase with traces of chromium or other coloring elements, while others describe it as a ruby-bearing assemblage rather than a discrete mineral. Because there is no established chemical formula, reported physical properties, including color (red to pink), luster (vitreous), and hardness, vary with sample and description.

Rubiinit has appeared primarily in limited, region-specific publications concerning ruby-bearing metamorphic or igneous rocks. Its ambiguous status has led to cautious interpretation and reporting in the literature.

Because rubiinit is not a formally recognized mineral, information about it is often provisional and may differ between sources. For context on rubies and related minerals, see ruby and corundum.