The mineral is deposited from low temperature hydrothermal solutions which have come into contact with carboniferous lithologies, releasing methane, such as in graphitic schists or, primarily, from areas surrounding coa
Valid Species (Pre-IMA) 1852
The classic locality occurs in the anthracite deposits of the Doehlener Basin of Freital and Burgk, where clear crystals of up to 2 cm, mostly twinned, are found in association with ca
Link to MinDat.org Location Data.
Named after the British mineralogist, crystallographer and natural philosopher William Whewell (1794-1866), professor of mineralogy at Cambridge.