Minerals & Gemstone 480x104
Minerals & Gemstone 480x104
Minerals V2 banner 160x600



Advertising Information

Botryoidal Black Romanechite

The Mineral romanechite




Romanechite is sometimes synonymous with Psilomelane, but in reality Romanechite is a strictly defined mineral that is recognized by the IMA, whereas Psilomelane is not specifically identified, or is a compound of several barium manganse oxides including Romanechite. Romanechite is named after the locality of Romanèche-Thorens in France, the type locality for this mineral.
Chemical Formula (Ba,H2O)2(Mn4+Mn3+)5O10
Composition Hydrous barium manganese oxide
Color Dark gray to black
Streak Black to brownish black
Hardness 5.5 - 6
Crystal System Monoclinic
Crystal Forms
and Aggregates
Never in individual crystals. Habits include botryoidal, mammilary, reniform, stalactitic, radiating, acicular, fibrous, dendritic, arborescent, encrusting, massive, and earthy.
Transparency Opaque
Specific Gravity 4.7 - 5
Luster Submetallic, silky, dull
Cleavage None
Fracture Conchoidal, uneven, earthy
Tenacity Brittle
In Group Oxides; Hydroxides
Striking Features Color, streak, and association with other manganese minerals
Environment As a secondary mineral in hydrothermal replacement deposits, in sandstones, limestones, and clays.
Rock Type Sedimentary, Metamorphic
Popularity (1-4) 3
Prevalence (1-3) 2
Demand (1-3) 2


Romanechite ON EBAY



USES
Romanechite is an ore of manganese. 

NOTEWORTHY LOCALITIES
Romanechite occurs in many manganese deposits, though most often in uninteresting habit and not necessarily identified. The type locality for Romanechite is Romanèche, Saône-et-Loire, France. Other important localities include the Clara Mine, Oberwolfach, Black Forest, Baden-Württemberg, Germany; the Adam Heber Mine, Neustädtel, Schneeberg, Saxony, Germany; and an unspecified locality in Pinal Co, Arizona which has recently been producing nice specimens.

COMMON MINERAL ASSOCIATIONS
Barite, Pyrolusite, Quartz, Hematite

DISTINGUISHING SIMILAR MINERALS
Pyrolusite - Most commonly in crystallized aggregates, which are lacking in Psilomelane.
Hematite - Has a red streak.
Goethite - Yellow streak, lower specific gravity, usually a darker color.


romanechite PHOTOS
 
ADDITIONAL RESOURCES
 
DISCUSSIONView Forum | Post to Forum
Have a question about Romanechite? Visit our Q&A Community and ask the experts!
PAGE SPONSOR  

To sponsor this page, click here.

Let us know how we can update this page
(Click for more details)
We strive for accurate content and locality information. If you feel any of the content is incorrect, or if you feel we are missing vital locality information, please fill out the form below so we can update the site. If you are requesting a locality be added, please only include significant locality occurences for the mineral.