$350Median
7Sold (12 mo)
$450Last sale
Romanechite specimens for sale
5 for sale · $350–$3,653 USD
13 in the gallery
Romanechite is a mineral that belongs to the hydromanganate family and forms as monoclinic to layered aggregates. It typically presents as brown to black crystals or masses with a metallic to dull lustre and a somewhat radiating habit. The mineral’s structure accommodates manganese in mixed valence states, contributing to its characteristic color and sheen, and it often occurs in association with other manganates and oxides in oxide-rich hydrothermal and secondary oxidation zones.
- Formula
- (Ba,H2O)2(Mn4+,Mn3+)5O10
- Rarity
- Common
- Stability
- Moderately Stable
- Collector interest
- Moderate Interest
- Classification notes
- Oxide; Manganese oxide, hydrated; Strunz classification uncertain
Key characteristics
- Crystal system
- monoclinic
- Mohs hardness
- 5–6
- Specific gravity
- 4.7–4.8
- Luster
- submetallic, dull
- Transparency
- opaque
- Color
- black, gray, brown
- Streak
- black, brown
- Cleavage
- perfect
- Fracture
- uneven
- Crystal habit
- massive, botryoidal, reniform, stalactitic, fibrous, granular
- Gem mineral
- Classic / historic
Buy Romanechite specimens
View all 5Where Romanechite is found
Top localities
- Montreal Mine2 specimens
- China1 specimen
- Morocco1 specimen
- Adam Heber Mine1 specimen
- Cary Mine1 specimen
- Chihuahua1 specimen
- Dry Gill Mine1 specimen
- Lake George area1 specimen
About Romanechite
Notable specimens have come from classic localities in the United States, Germany, and Hungary, among others, where hydrothermal and secondary oxidation environments have promoted its growth into robust, plate-like or acicular aggregates. Collectors prize Romanechite for its distinctive, earthy to metallic appearance and its relationship to other layered manganates, which can yield attractive, contrastive crystals when exposed in polished surfaces or matrix. The mineral’s moderate hardness and its tendency to form aesthetically pleasing radiating clusters add to its appeal for display and study alike.
