Another mineral which contains no oxygen is the well-known fluor-spar.
"Geology"
James Geikie
Where does fluor-spar occur?
"Geology"
James Geikie
Among these black schorl or tourmaline, actinolite, zircon, garnet, and fluor spar are not uncommon; but they are too sparingly dispersed to modify the general aspect of the rock.
"The Student's Elements of Geology"
Sir Charles Lyell