Siderite, cassiterite and calcite are all epitaxial on nordenskiöldine (Mindat).
Specific gravity: 4.09 to 4.20
Hardness: 5½ to 6
Colour: Colourless, yellow; colourless in transmitted light
Solubility: Incompletely decomposed by hydrochloric acid
Nordenskiöldine is an extremely rare borate.
At the type locality, Store Arøya, Langesundsfjorden, Larvik, Vestfold, Norway, nordenskiöldine is a very rare mineral in a syenite pegmatite, associated with meliphanite, homilite, zircon, molybdenite, cancrinite, analcime and feldspar (HOM, Mindat, Dana).
At Arandis, Erongo Region, Namibia, nordenskiöldine has been found in a hydrothermal deposit in metasomatised marble, associated with tourmaline, cassiterite, stannite, chalcopyrite, pyrrhotite, siderite and calcite (HOM).
Nordenskiöldine Alters to cassiterite (Mindat).
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