In addition to the magnetite which forms both massive lodestone and crystals, the complex is strewn with odd and rare minerals, and is the type locality for five mineral species.
en.wikipedia.org It occurs associated with quartz, siderite, stilpnomelane, greenalite and magnetite.
en.wikipedia.org It largely consists of the mineral corundum (aluminium oxide), mixed with other species such as the iron-bearing spinels, hercynite, and magnetite, and also rutile (titania).
en.wikipedia.org Typical associated minerals include hausmannite, galaxite, braunite, pyrolusite, coronadite, hematite and magnetite.
en.wikipedia.org They consist of black, medium- to coarse-grained, olivine-rich basalt that contains plagioclase, olivine, clinopyroxene, magnetite-ilmenite, and biotite.
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