sementitt

Sementitt is a naturally occurring mineral with the chemical formula Fe(OH)2. It belongs to the hydroxide group of minerals and is characterized by its iron content. Sementitt is known to be a relatively rare mineral. Its formation is typically associated with low-temperature hydrothermal environments and often found in association with other iron-bearing minerals.

The mineral appears as a white to pale yellow substance in its pure form, though impurities can cause it to exhibit various shades of gray or brown. Sementitt is soft and has a relatively low density. It is typically found in crystalline form, often as small, flaky aggregates or as a powdery coating.

Sementitt's primary occurrence is within sedimentary rocks, particularly in iron-rich formations. It can also be found in metamorphic rocks that have undergone alteration processes. Its presence can be an indicator of specific geological conditions, such as reducing environments where ferrous iron is stable. While not economically significant, its study contributes to understanding mineral genesis and the geochemistry of iron in the Earth's crust.