None of the research I did has proven to be fruitful. What I have found:
multiple studies regarding what mixing goethite into cement does to the compressive strength of that cement
multiple studies regarding the compressive strength of rocks and ores that happen to have some goethite or magnetite in them, alongside other minerals
a few studies regarding the usage of magnetite in biomedical implants when combined with other materials
multiple studies regarding how goethite effects the mechanical properties of soil, which only mention the mechanical properties and compressive strength of the soil, and not of its individual components
no studies or sets of information that actually tell me what the compressive strength of goethite is
Does anybody know what the compressive strengths of goethite and magnetite are, or have a reliable source of information that I can use to find out?