Hydromagnesite : Mg5(CO3)4(OH)2·4H2O
Artinite : Mg2(CO3)(OH)2·3H2O
As recorded:
Todt Hill Serpentinite, Staten Island, New York City, New York, USA
6cm x 4cm x 3.5cm
weight: 66g
Photo added to mindat.org
“Chunk of serpentinite with balls of hydromagnesite and radiating needles of artinite. From an old collection.”
Harold Moritz - 17th December 2015
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