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Named for the magnesium content in the composition and for its relationship to hastingsite. Magnesiohastingsite is an uncommon mineral that is found in alkaline basalts, in andesites, latites, tephrites, and tuffs, and in carbonatites. Localities include Austria, the Czech Republic, Germany, Sweden, Russia, Greenland, Canada, the United States, and Zimbabwe.

Ref. Handbook of Mineralogy, Anthony et al (1995) and MSA at http://www.handbookofmineralogy.org/pdfs/magnesiohastingsite.pdf

Magnetite is an old term that is possibly in reference to Magnesia in Greece which was a site for lodestone. Magnetite is a common mineral with thousands of localities worldwide. It is “a common accessory mineral in igneous and metamorphic rocks in which magmatic segregations or contact metamorphism may produce economically viable deposits [as well as] in sedimentary banded iron formations, [as] a biogenic product, [and in] important detrital deposits.” Magnetite, as one can determine from its name, is highly magnetic.

Ref. Handbook of Mineralogy, Anthony et al (1995) and MSA at http://www.handbookofmineralogy.org/pdfs/magnetite.pdf