Axinite

axinite

axinite-(Fe)

axinite-(Mg)

axinite-(Mn)

Images

Axinite represents three minerals:
Axinite-(Fe) Ca4Fe2+2Al4[B2Si8O30](OH)2
Axinite-(Mg) Ca4Mg2Al4[B2Si8O30](OH)2
Axinite-(Mn) Ca4Mn2+2Al4[B2Si8O30](OH)2
All of these are sorosilicates (Si2O7 groups) and members of the axinite group

Localities

At Heng Fa Chuen, Hong Kong Island, Hong Kong, China, axinite occurs in a pegmatite at the Chai Wan MTR (Mass Transit Railway) railway depot, just southeast of the Heng Fa Chuen MTR station, adjacent to the eastern entrance of the MTR railway tunnel. The pegmatite cavity occurs in medium-grained granite almost completely devoid of biotite. About 20 m away the contact of granite with pyroclastic rocks is exposed. The pegmatite cavity is about 40 cm wide and contains axinite, K-feldspar, milky quartz and muscovite (Geological Society of Hong Kong newsletter 2.1.9).

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