Moss agate (also called mocha stone) is a semi-precious gemstone formed from silicon dioxide.

In place of genteel white clapboard or ivy-covered brick on plots with wide side yards, houses of mocha stone or battleship gray stucco now predominate.

Other types of pseudofossils are kidney ore (round shapes in iron ore) and moss agates, which look like moss or plant leaves.

In early years astronomy and natural history, especially botany, engaged much of his attention; he became an enthusiastic worker at the microscope, studying the structure of shells, corals, moss agates, and flints.

Moss agate (also called mocha stone) is a semi-precious gemstone formed from silicon dioxide.

In place of genteel white clapboard or ivy-covered brick on plots with wide side yards, houses of mocha stone or battleship gray stucco now predominate.