8btadr ((HEMATITE pseudomorph after MAGNETITE)), $10 MINIMUM BID, Payun Volcano, Altiplano de Payun Matru, Mendoza, Argentina, 2.4 x 1.7 x 1.3 cm, Thumbnail | |
Fine elongated octahedral crystals with sharp well formed edges at right angles in all three axis forming a corner the herringbone twinning of certain silver and copper specimens. Neat lustrous thumbnail sized specimen. |