Sorosilicate (Si2O7 groups), axinite group
Specific gravity: 3.23 to 3.32
Hardness: 6½ to 7
Colour: Brown, clove-brown, plum blue, pearl grey
Solubility: Insoluble in water, hydrochloric, nitric and sulphuric acid
Plutonic igneous environments
Axinite-(Fe) is found in quartz - calcite
in alpine-type veins, as shear zone mineralisation, especially in high grade metamorphic zones, as hydrothermal metasomatism of
granite or aplite, rarely in
granite pegmatites, and in the
contact zones surrounding
Associated minerals include epidote - clinozoisite, grossular, vesuvianite, ilvaite, hedenbergite, hastingsite, andradite, zoisite, actinolite, datolite, tourmaline, calcite, albite, quartz, danburite, prehnite, titanite, plagioclase, microcline, arsenopyrite, pyrite and zeolites (Dana, HOM).
Rarely, axinite-(Fe) may be replaced by clinochlore - chamosite or clay minerals (Dana).
The type localities is Saint Christophe-en-Oisans, Isère, Auvergne-Rhône-Alpes, France.
At the Belvidere Mountain Asbestos Quarries, Lowell/Eden, Vermont, USA, a specimen has been found with crystals of axinite-(Fe) to 2 cm associated with epidote and chrysotile (R&M 90.6.527).
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