SCANDINAVIAN MINERALS

Robertsite, Tip Top Mine, Fourmaline, Custer County, South Dakota, USA.
Type Locality.

Robertsite is a secondary phosphate mineral that belongs to the mineral group of mitridatite.
It was discovered in 1974 from the Tip Top mine, Custer County, USA.
Robertsite occurs as minute crystal aggregates.
Our specimen obtained in 1984 shows good brown crystals in a cross section.

Chemical formula: Ca₂Mn³⁺₃(PO₄)₃O₂ · 3H₂O
Additional reading Mindat.org.

All prices are in Swedish currency or US$.
Exchange rate 100:- SEK. (= €10, $9, £12)
No Discount.

This Lot was published in June 2026.

Item: ro. Robertsite, Tip Top Mine, Fourmaline, Custer County, South Dakota, USA. Size: 7x5cm. 138:-SEK. US$14.00.

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