Pronunciation: [kˈɑːstənˌa͡ɪt] (IPA) 
Karstenite is a mineral that belongs to the serpentine group. Its chemical formula is Mg_6Cr_2CO_3(OH)_16·4H_2O. The word "Karstenite" is spelled with a "k" at the beginning instead of a "c." This is because the word is named after the German chemist and mineralogist Abraham Gottlob Werner's assistant, Johann Carl Ludwig Karsten. The pronunciation of Karstenite is kɑː(r)stənaɪt, with the stress on the second syllable.
Karstenite is a rare mineral that belongs to the oxalate mineral group. It is named after a renowned German mineralogist, Dr. William Albert Karsten. Karstenite is typically found in oxidized manganese deposits and forms as a secondary mineral. It is often associated with other minerals such as pyrolusite, quartz, bementite, and rhodochrosite.
In terms of physical characteristics, karstenite is usually identified as small, dense, and tabular crystals. It is commonly colorless or white, sometimes displaying a pale yellow or green tinge. The crystal structure of karstenite is monoclinic, and it is known for its brittle nature due to its perfect cleavage. It has a Mohs hardness of around 2-3.
Chemically, karstenite is composed of hydrated calcium manganese oxalate, with the chemical formula CaMn2+2(C2O4)2·2H2O. It has a relatively high density, often weighing more than three times that of water. Karstenite is also known for its fluorescent properties, sometimes emitting a bright green or yellowish light under ultraviolet radiation.
Due to its rarity and limited occurrence, karstenite has mostly been studied for its mineralogical significance. Its crystallographic and physical properties have been valuable in understanding mineral formation processes and furthering research in the field of crystallography. Despite its limited practical applications, karstenite remains a sought-after mineral among collectors and enthusiasts.
The word "Karstenite" was named after the German chemist and mineralogist, Adolph Friedrich Karsten (1817-1907). Adolph Karsten was known for his contributions to the field of crystallography and mineralogy. In 1877, the Russian mineralogist Vasily Popov discovered a new mineral and named it in honor of Adolph Karsten as "Karstenite" to recognize his significant contributions to the field.
