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Hydromagnesite
Type Locality
Castle Point, Hoboken, Hudson Co., New Jersey, USA
Mineral Data
Mg
5
(CO
3
)
4
(OH)
2
·4H
2
O
Strunz:
5.DA.05
Physical Properties
Crystal System:
Monoclinic
Hardness:
3.5
Tenacity:
brittle
