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Jahnsite-(CaMnMg)

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CSL134072

Jahnsite-(CaMnMg)

Type Locality

Description Tabs

Description
Locality: 
Tip Top Mine, Fourmile, Custer County, South Dakota, United States of America
Size Range: 
Thumbnail (1-3cm)
Size: 
1 × 0.8 × 1.2 cm
Description

Rare Ca-Mn-Mg-Fe bearing phosphate mineral from the famous pegmatite locality Tip-Top Mine, South Dakota. It forms tiny brown tabular crystals with dark green-black rockbridgeite, pinkish hureaulite and some other phosphate minerals.

Mineral Data
What's on the rock

Jahnsite-(CaMnMg)

Formula: 
{Ca}{Mn2+}{(Mg,Fe2+)2}{Fe3+2}(PO4)4(OH)2·8H2O
Strunz: 
8.DH.15
Hardness: 
4.0
Streak: 
White
Type Locality: 
Tip Top Mine (Tip Top pegmatite), Fourmile, Custer District, Custer Co., South Dakota, USA
Loranth Minerals

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