klinohumit

Klinohumite is a rare silicate mineral with the chemical formula (Mg,Fe)9(Si4O16)(OH)2. It belongs to the humite group of minerals, which are characterized by their layered structure and the presence of hydroxyl groups. Klinohumite is known for its distinctive monoclinic crystal system and its association with metamorphosed carbonate rocks, particularly those rich in magnesium and iron.

The color of klinohumite can vary widely, ranging from pale yellow to reddish-brown and dark brown, depending on the iron content. It typically occurs as small, often prismatic or tabular crystals, and can also be found in granular or massive forms. The hardness of klinohumite is generally between 5.5 and 6 on the Mohs scale, and it possesses a vitreous to greasy luster. Its specific gravity is around 3.2 to 3.3.

Klinohumite is found in various geological settings worldwide, often as a minor constituent in metamorphosed marbles, skarns, and some high-temperature hydrothermal deposits. Notable occurrences include those in the Siberian platform, the Alps, and parts of the United States. Due to its rarity and often small crystal size, klinohumite is not a commercially significant mineral, but it is of interest to mineral collectors and researchers studying metamorphic petrology and mineral chemistry. Its presence can provide insights into the P-T conditions under which the host rocks were formed.