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Johnwalkite

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Johnwalkite

Type Locality

Description Tabs

Description
Locality: 
Champion Mine, Keystone, Pennington County, South Dakota, United States of America
Class: 
Single Crystal
Size Range: 
Micromount (under 1cm)
Size: 
0.05 × 0.05 × 0.05 cm
Description

Brown single crystal aggregate of the extremely rare K-Mn-Nb phosphate mineral johnwalkite from the type and only known locality worldwide in Southdakota.

Don't miss the opportunity to get this extreme rarity almost never seen in the mineral market.

Ex Vandenbroucke Museum collection from Waregem, Belgium.

No duplicates available

Mineral Data
What's on the rock

Johnwalkite

Formula: 
K(Mn2+,Fe2+,Fe3+)2(Nb5+,Ta5+)(PO4)2O2·2(H2O,OH)
Strunz: 
8.DJ.05
Hardness: 
4.0
Type Locality: 
Champion Mine, Keystone, Keystone District, Pennington Co., South Dakota, USA

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