Biotite-bearing gneiss or schist

Gray-blue, coarse-grained, with reflective platy mica and pale quartz/feldspar patches; likely Mohs hardness 2.5–7 depending on the grain, with mica’s excellent basal cleavage and vitreous to pearly luster. The elongate fragment appears foliated, though the photo is insufficient to distinguish schist from gneiss confidently.

Formed when quartz- and feldspar-rich sedimentary or igneous rocks were buried and metamorphosed under moderate to high temperature and pressure. Such rocks are commonly Precambrian to Paleozoic in age, but the specimen’s exact age cannot be determined visually.

Used locally as aggregate, road stone, fill, and sometimes decorative building stone; attractive mica-rich pieces are mainly collector specimens rather than jewelry material.

The shiny flakes are probably biotite or muscovite mica. Blue-gray color may reflect weathering, lighting, or minor amphibole rather than a distinct blue mineral.

Likely identification near 27.0°N, 84.8°E is regionally plausible because Himalayan foreland and nearby upland drainage systems contain transported metamorphic rock fragments. Check for planar foliation, flaky mica, and a streak of pale quartz; a fresh surface and acid test would improve identification.