8btadis ((HEMATITE pseudomorph after MAGNETITE)), $10 MINIMUM BID, Payun Volcano, Altiplano de Payun Matru, Mendoza, Argentina, 5.3 x 3.3 x 1.6 cm, Miniature | |
Fine elongated octahedral crystals at right angles to the main crystal resembling the herringbone twinning of certain silver and copper specimens. |