hartiten.

/ˈhɑːtʌɪt/Etymology: < hart n. + -ite suffix1.
Mineralogy.
1865 H. Watts III. 14 Hartite, another fossil resin from the lignite of Oberhart. Olblique prisms belonging to the monoclinic system.
This entry has not yet been fully updated (first published 1898; most recently modified version published online June 2018).