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Eggletonite
Type Locality
Big Rock Quarry (3M Quarry; Arch Street Pike Quarry), Granite Mountain area, Little Rock, Pulaski Co., Arkansas, USA
Mineral Data
(Na,K,Ca)
2
(Mn,Fe)
8
(Si,Al)
12
O
29
(OH)
7
·11H
2
O
Strunz:
9.EG.30
Physical Properties
Colour:
Brown
Crystal System:
Monoclinic
Hardness:
3.0 - 4.0
