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Mineralpedia Details for Dickinsonite

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Dickinsonite

Dickinsonite

Now considered a synonym of Dickinsonite-(KMnNa), this mineral was named after Reverend John William Dickinson of Connecticut, USA who was an early collector of Branchville minerals where the mineral gets its type locality from the Fillow quarry in Branchville, Connecticut. Dickinsonite is a rare mineral that can be found in additional USA localities including here in the Black Hills of South Dakota at the Nickel Plate mine, as well as in Rwanda, Namibia, the Czech Republic, and Australia. Associated minerals at the type locality include eosphorite, triploidite, lithiophilite, rhodochrosite, eddingite, and fairfieldite.

Ref. Handbook of Mineralogy, Anthony et al (1995) and MSA at http://www.handbookofmineralogy.org/pdfs/dickinsonite.pdf

Formula
KNa4Ca(Mn2+,Fe2+)14Al(PO4)12(OH)2 
Crystal System
Monoclinic 
Crystal Habit
Foliated, Micaceous 
Cleavage
Perfect, None, None 
Luster
Vitreous - Pearly 
Color
brownish green, green, yellow green 
Streak
white 
Class
Monoclinic - Domatic 
Fracture
Brittle - Uneven 
Hardness
3.5-4 
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Dickinsonite from Branchville, Fairfield Co., Connecticut, United States

Dickinsonite
            from Branchville, Fairfield Co., Connecticut, United States

Dickinsonite is a memebr of the Arrojadite series, which is typically a bottle green color. This specimen has embedded crystals, some in radial patterns and is probably associated with Hureaulite.

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Dickinsonite from Lithium Corp. of America mine, Gaston Co., North Carolina, United States

Dickinsonite
            from Lithium Corp. of America mine, Gaston Co., North Carolina, United States

Bottle green platy crystals (probably flattened along a seam) to 1mm.

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