Rajatises

Rajatises are a group of mineral aggregates characterized by a silvery luster, thin tabular sheets, and an iridescent surface. They form seam-like layers within metamorphic rocks and are notable for their reflective laminae.

The name derives from rajata, a word for silver in several languages, adapted by early mineralogists who cataloged the deposits. The plural form rajatises is used for the mineral family.

Chemically, rajatises are complex silicates that include silver-bearing sulfides, with trace copper and nickel. They typically crystallize as flat plates, have a Mohs hardness near 4–5, and range in color from pale gray to bright silver.

Formation occurs through metasomatic and hydrothermal processes associated with late-stage magmatic activity. They are found in narrow belts adjacent to granitic intrusions and commonly occur as seams within schists and phyllites.

Uses are mainly decorative and as study specimens. Their brittleness and laminar habit limit industrial use, but they can serve as indicators of related hydrothermal systems in exploration.

First described in the early 22nd century by mineralogists Clara Mendez and Hiro Tanaka, rajatises have since prompted further localities and analytical work.