Mineralogy Photography

Axinite-(Fe)

axinite-Fe (1)

Structural info:

axinite-Fe

Name origin: The name “axinite” is derived from the Greek αξίνα (“axina”) for “axe”, in allusion to the common habit of its crystals. In 2008 it was renamed by IMA with suffix “-Fe” for iron dominance in the formula .

Axinite-(Fe) belongs to rare group of calcium aluminum borate silicate minerals. Colour of axinite group minerals vary depending on its exact composition, ussual colours of Axinite-(Fe) are clove-brown, brown, plum-blue or pearl-gray. Colours of other members of axinite group can from lilac to violet and from brown to reddish brown. Axinite is strongly pleochroic, which means it can display several different colors depending on the viewing and lighting angle. Pleochroism only exists in gems with doubly refractive crystals and it is caused by differing absorption of light rays within the crystal. Its crystal system is triclinic, with crystals appearing flat and spatula-shaped. Axinite occurs in low to high grade regionally metamorphosed rocks, contact metamorphic rocks and pegmatites. This mineral is brittle, with cleavege good on {100}, poor on {001} {110} {011} and irregural, chonchoidal fracture. Its streak is white.

This sample shows brown, spaddle like crystals on quartz matrix. It comes from Bor Pit, Dal’negorsk B deposit, Russia. It is valued at approximely 15€.

axinite-Fe (2)

axinite-Fe (3)