Banded Quartzite or Gneissic Pebble

Hardness: 7 (Mohs scale), Color: White with grey/black bands, Luster: Dull to waxy, Crystal Structure: Microcrystalline, Cleavage: None, Specific Gravity: 2.6-2.7. It is water-worn and smoothed.

Formed through high-grade regional metamorphism of sandstone (quartzite) or igneous parent rocks (gneiss). The banding result from intense pressure and heat causing mineral segregation. These pebbles are typically found in glacial till, riverbeds, or beaches after millions of years of erosion.

Primarily collected as a decorative garden stone, landscape material, or beach pebble. Harder specimens are used as abrasives or in construction aggregate.

The smooth, rounded shape of this specimen indicates it has spent a significant amount of time being tumbled by water or glacial ice. The dark bands are likely composed of minerals like biotite, hornblende, or magnetite.

Identify in the field by its hardness (it will scratch glass) and distinct, non-random layering. Common in areas with a history of glaciation or near ancient mountain ranges.