Item talk:Q41375
From geokb
Mindat Description
A coal with greater than 90% carbon content dry ash free and less than 14% volatiles
Geoscience Ontology Description
Coal that has vitrinite mean random reflectance greater than 2.0% (determined in conformance with ISO 7404-5). Less than 12-14 percent volatiles (dry, ash free), greater than 91 percent fixed carbon (dry, ash free basis). The highest rank coal; very hard, glossy, black, with semimetallic luster, semi conchoidal fracture.
