Home > American Minerals IV – August 26 > MS1643 Dickinsonite-(KMnNa)


Dickinsonite is a phosphate mainly of manganese however containing several other essential cations; it is a member of the arrojadite group (Chopin et al., 2005). Brush & Dana (1878) originally described this species from elsewhere in New England, naming it after Reverend William Dickinson (1835-1899), a mineral collector from Redding, Connecticut. At this locality, the listed arrojadite group species is dickinsonite-(KMnNa) (Smith, 2005).

Dickinsonite here forms a yellowish olive mass, 30 by 18 mm, in pegmatite. In this example, dickinsonite-(KMnNa) formed during initial crystallization of the pegmatite, making it a primary phosphate species. The pegmatite matrix consists mainly of microcline and muscovite with minor quartz and blue (fluor)apatite. This specimen was part of the Charles Trantham (1936-2020) estate.

Price: $75

Item code: MS1643

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