Rinds, Coatings, and Crusts

Terrestrial processes, most notably weathering, chemical deposition, and desert varnish, can produce rinds, coating, and crusts on rocks. Sometimes these coatings are shiny like meteorite fusion crusts. Meteorite fusion crusts are shiny because they are glassy.

Hematite often precipitates from solution to form forms coatings on other rocks

Here are two views of a thick rind of hematite on a rock (sawn face on right).

A most excellent example of a hematite coating precipitated onto a host rock.