GEHLENITE, noun [from Gehlen, the chimist.] A mineral recently discovered, in the description of which authors are not perfectly agreed. According to the description and analysis of Fuchs, it appears to be a variety of idocrase; but according to the observations of Prof. Clarke, it is probably a new species.
Source: Webster's 1828 American Dictionary ↗ · public-domain · returned verbatim, no AI