<--- 4 mm--->
Shigaite
[AlMn
2+
2
(OH)
6
]
3
(SO
4
)
2
Na(H
2
O)
6
[H
2
O]
6
Homer Mine, iron Co., Michigan, U.S.A
[Penax K-7 + NY-1S + Meiji EMF-2P/10
Software: Helicon Focus Pro]