Romanèchite
A variety of Minerals
What is Romanèchite?
Romanèchite ((Ba,H2O)2(Mn,Mn)5O10) is the primary constituent of psilomelane, which is a mixture of minerals. Most psilomelane is not pure romanechite, so it is incorrect to consider them synonyms. Romanèchite is a valuable ore of manganese, which is used in steelmaking and sodium battery production. It has a monoclinic crystal structure, a hardness of 6 and a specific gravity of 4.7-5. Romanèchite's structure consists of 2 × 3 tunnels formed by Mn oxide octahedra. It is associated with hematite, barite, pyrolusite, quartz and other manganese oxide minerals. It has been found in France, Germany, England, Brazil, India, and various parts of the United States, including Arizona, Virginia, Tennessee and Michigan, and sites throughout the Appalachian Valley and Ridge.
Optical Properties
- Optical Character
- Biaxial positive or negative
Market Value Factors
Pricing varies for every rock and mineral, so use these universal factors to gauge Romanèchite before comparing listings or appraisals.
Size & Weight
Larger, intact specimens usually command higher prices.
Rarity & Demand
Scarce material or popular varieties sell at a premium.
Condition & Finish
Chips, repairs, and heavy wear lower value; clean prep helps.
Treatment & Provenance
Untreated specimens with documented locality are prized.
Romanèchite Localities Map
See where Romanèchite is found with a localities map, collecting zones, and geology context. Generate a sample map preview below.
Quick Facts
Physical Properties
- Color
- Greyish black, black
- Hardness (Mohs)
- 5 - 6
- Streak
- Black, brown
Chemical Properties
- Chemical Formula
- (Ba,H2O)2(Mn4+,Mn3+)5O10
- Elements
- Ba, H, Mn, O
Also Known As
Identify Romanèchite Instantly
- Snap a photo, get instant results
- 6,700+ rocks, minerals & crystals
- Discover collecting spots near you
Romanèchite FAQs
How do I identify Romanèchite?
Romanèchite can be identified by its hardness of 5 - 6 on the Mohs scale, Greyish black color. Look for these key characteristics when examining specimens.
What color is Romanèchite?
Romanèchite typically appears in Greyish black, black. Color can vary depending on impurities and formation conditions.
How hard is Romanèchite?
Romanèchite has a hardness of 5 - 6 on the Mohs scale. This gives it moderate hardness.
%252FAbenakiite-(ce)-01.jpg&size=small)
