BIXBYITE (Mn,Fe)2O3 (cubic) . Black cubic crystal in rhyolite . Thomas Range, Juab County, Utah . 方鐵錳礦為一錳鐵氧化礦物，黑色正六面體，金屬光澤，硬度 6∼6.5， 產於流紋岩的間隙，與黃玉，石榴石等共生．
礦名來源：Named after the American mineralogist, M. Bixby.

經典名礦欣賞．２．３．４．５
NO.180