Noun
Black tourmaline.
Source: Webster's dictionaryAt the time it was not realised that schorl and tourmaline were the same mineral (it was only about 1703 that it was discovered that some colored gems weren't zircons ). Source: Internet
Dravite forms multiple series, with other tourmaline members, including schorl and elbaite. Source: Internet
Elbaite tourmalines are allochromatic, deriving most of their color and magnetic susceptibility from schorl (which imparts iron) and tsilaisite (which imparts manganese). Source: Internet
Magnetism Opaque black schorl and yellow tsilaisite are idiochromatic tourmaline species that have high magnetic susceptibilities due to high concentrations of iron and manganese respectively. Source: Internet