[6] Ferrogedrite exists in low temperature, high pressure contact metamorphic geologic settings[7] and remain stable up to 600 °C-800 °C due to its iron content.

The M4 site is the most important for classification[8] housing the largest cation and causing behavior similar to monoclinic amphiboles.

[7] A low-temperature solvus in the mineral causes exsolution changing the chemistry of a specimen[9] resulting in confusing variations and close peaks in the diffraction pattern due to overlapping of phases.

The Fe2+ are smaller cations in the M4 site than monoclinic amphiboles rich in Na and Ca and results in weakness under pressure.

[13] Ferrogedrite is identified optically by its distinct cleavage and twinning with angles wider (650 and 1330)[14] than its counterparts, its dark-green to brown rims.