Conglomerate

Mohs hardness varies widely depending on clast composition and matrix binder (typically 3-7). Displays a distinct clastic texture with rounded to sub-rounded pebbles set within a finer matrix. Luster ranges from dull to earthy. Colors vary widely according to included rock fragments, commonly showcasing shades of green, gray, brown, and cream.

Forms from the lithification of rounded gravel and pebble deposits, typically accumulated in high-energy aqueous environments such as fast-flowing rivers, alluvial fans, or ocean beaches where wave action wears down sharp fragment edges over geological time.

Utilized mainly in construction as coarse aggregate, decorative building stone, landscaping gravel, or polished interior slabs. Unbound deposits serve as road base material.

The degree of clast roundness in conglomerate serves as a key indicator of geological transport distance; the more rounded the pebbles inside, the further they traveled before burial and cementation.

Identified by prominent, visible rounded rock fragments (larger than 2mm) cemented in a fine-grained matrix. Widely found in ancient riverbeds, alluvial basin deposits, and mountain front formations globally.