Where is Manganese Dendrites found?
Manganese oxides
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Open the appManganese Dendrites occurs in specific geological environments. Knowing where to look, and in what kind of rock, is the difference between going home empty-handed and finding a great specimen.
Where to find Manganese Dendrites
Worldwide
Manganese dendrites are common and can be found in sedimentary rock formations globally, wherever manganese-rich groundwater has permeated porous or fractured rocks. Notable occurrences include limestones in the United States (e.g., Kansas, Missouri), sandstones in various regions, and shales.
Limestone quarries and outcrops
Often observed on exposed surfaces of limestone, particularly in areas with historical or ongoing groundwater flow.
Sandstone formations
Can be found on bedding planes and fracture surfaces within sandstones.
Collecting tips
- Look for host rocks. Focus on sedimentary rocks like limestone, sandstone, and shale. Examine exposed surfaces, especially those that have been subjected to weathering.
- Examine fracture surfaces and bedding planes. Dendrites preferentially form along these pathways where fluids can easily penetrate.
- Distinguish from true fossils. Manganese dendrites lack cellular structure or organic remains. They are purely mineralogical formations. A magnifying glass can help differentiate.
- Check for black or dark brown patterns. The characteristic color is a key indicator. The patterns are typically flat against the rock surface.
Quick Check
- Color:
- Black to dark brown
- Luster:
- Dull to earthy
- Streak:
- Black to brownish-black
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