Top panel: AKARI/IRC spectrum of LEDA 1712304 shown together with the best-fit model (model 7; red solid line). Bottom panel: close-up view of the fitting results of the 10 μm silicate absorption feature with various spectral models and the residuals normalized by the errors. Black, purple, blue, green, orange, brown and red solid lines show the astronomical silicate (model 1), amorphous olivine (Mg_2xFe_2−2xSiO₄, x = 0.5; model 2), amorphous olivine (x = 0.4; model 3), a combination of the amorphous olivine (x = 0.5) absorption and absorption-free emission component (model 4), the porous amorphous olivine (x = 0.4; model 5), the 1 μm-sized amorphous olivine (x = 0.4; model 6) and a mixture of the porous amorphous olivine (x = 0.4) and the crystalline pyroxene (model 7), respectively.