
1) Cubic mineral 2) Iron mineral
Found on
https://www.crosswordclues.com/clue/franklinite

Franklinite is an oxide mineral belonging to the normal spinel subgroup`s iron (Fe) series, with the formula ZnFe3+2O4. As with another spinel member magnetite, both ferrous (2+) and ferric (3+) iron may be present in Franklinite samples. Divalent iron and/or manganese (Mn) may commonly accompany zinc (Zn) and trivalent manganese may substitute f....
Found on
http://en.wikipedia.org/wiki/Franklinite

• (n.) A kind of mineral of the spinel group.
Found on
http://thinkexist.com/dictionary/meaning/franklinite/

(from the article `magnetite`) ...rocks and in granite pegmatites, stony meteorites, and high-temperature sulfide veins. The magnetite series also contains magnesioferrite ...
Found on
http://www.britannica.com/eb/a-z/f/57
Frank'lin·ite noun (Min.) A kind of mineral of the spinel group.
Found on
http://www.encyclo.co.uk/webster/F/72

Franklinite is a mineral found in Franklin, New Jersey, and used as an ore of zinc and manganese. With minor exceptions, the mineral is confined to Franklin, New Jersey. It has the formulae (Zn,Mn,Fe)(Fe,Mn)2O4 and a relative hardness of 7. Franklinite exhibits increased magnetism when it is heated.
Found on
http://www.probertencyclopaedia.com/browse/HF.HTM

a mineral of the spinel group, an oxide of zinc, manganese, and iron, occurring in black octahedral crystals or in masses: formerly mined for zinc.
Found on
https://www.infoplease.com/dictionary/franklinite
No exact match found.