$80Median
1Sold (12 mo)
$80Last sale
Ramsdellite specimens for sale
1 for sale · $75 USD
5 in the gallery
Ramsdellite is a manganese oxide mineral displaying a typically dark, metallic luster and a granular to crystalline habit. When well-formed, it can form compact, opaque crystals that reveal a subtle internal sheen and a steely gray to black color, reflecting its manganese-rich composition. In specimens, ramsdellite often accompanies other manganese oxides and oxide minerals, and is sometimes found in oxidized zones of manganese-rich hydrothermal deposits.
- Formula
- Mn4+O2
- Rarity
- Common
- Stability
- Stable
- Collector interest
- Moderate Interest
- Classification notes
- Oxide minerals; MnO2 polymorphs including ramdellite and pyrolusite; rutile-type structure
Key characteristics
- Crystal system
- orthorhombic
- Mohs hardness
- 3
- Specific gravity
- 4.72–4.83
- Luster
- metallic, submetallic, dull
- Transparency
- opaque
- Color
- black, gray
- Streak
- black, brown
- Cleavage
- perfect
- Fracture
- uneven
- Crystal habit
- prismatic, acicular, fibrous, granular, massive
Buy Ramsdellite specimens
View all 1Where Ramsdellite is found
Top localities
- Mistake Mine4 specimens
- Sierra County1 specimen
About Ramsdellite
Notable specimens come from the United States, where high-quality material has been documented. Collectors value ramsdellite for its relative rarity compared to more common manganese oxides, its compact to microcrystalline forms, and the occasional well-formed crystal that shows a durable, metallic surface. While individual crystals may be small, the mineral contributes to understanding manganese oxide chemistries and mineral paragenesis in oxidized zones. Its subdued luster and dark coloration make it a distinctive piece for cabinets focused on oxide minerals and manganese-bearing associations.
