$400Median
6Sold (12 mo)
$400Last sale
Groutite specimens for sale
8 for sale · $250–$725 USD
8 in the gallery
Groutite is a manganese oxide hydroxide mineral that forms as tabular or needle-like crystals and earthy masses. It typically displays a brown to reddish-brown color and a dull to pearly luster, often occurring in fracturing and oxidation zones of manganese-rich ore deposits. Associated minerals can include other manganese oxides and secondary manganese carbonates, with notable habits seen as fibrous, acicular, or platy aggregates. The mineral is most often discovered in secondary enrichment environments where groundwater has altered primary manganese minerals, yielding crusts and botryoidal aggregates that collectors value for texture and color.
- Formula
- MnO(OH)
- Rarity
- Rare
- Stability
- Moderately Stable
- Collector interest
- Moderate Interest
- Classification notes
- Manganese oxide/hydroxide; Oxide/hydroxide mineral, Strunz 04.DA
Buy Groutite specimens
View all 8Where Groutite is found
Top localities
- Robert Mine, Cuyuna North Range, Crow Wing County8 specimens
- Minnesota4 specimens
- N'Chwaning I Mine1 specimen
About Groutite
Significant specimens have been found in North American and European localities, with notable examples reported from the United States, Canada, Germany, and South Africa. Collectors seek groutite for its distinctive brown hues, unusual fibrous or tabular forms, and its role in the broader manganese-oxide suite. While not among the most famous mineral species, groutite provides interesting crystallography and surface features that appeal to those building a focused collection of manganese oxides and secondary minerals. Its modest luster and varied habit make it a practical addition for display alongside related Mn oxides and secondary minerals.
