Psilmelane | Gemopedia

The mineral psilomelane is now often called romanèchite, named for its discovery location in France. This mineral is a manganese oxide, and is actually a manganese ore. Romanèchite forms iron-black, dark steel-gray masses. Crystals are very rare this mineral, and specimens are often used for ornamental purposes.
Colors
Iron Black
, Steel Gray

Psilmelane Classification

Common Name

Psilmelane

Species

Psilmelane

Variety

Colors

iron black, steel gray

Alternate Names

Gemstone Groups

Key Separations

Specific gravity, fracture and streak.

Comments

Psilmelane Optical Properties

Transparency

Opaque

Refractive Index

Over the Limit 2.11-2.26

Birefringence

Optic Character

Optic Sign

Polariscope Reaction

Fluorescence

CCF Reaction

Pleochroism

Dispersion

Strength: none

Comments

Psilmelane Chemistry & Crystallography

Chemical Name

Chemical Formula

Ba.(H2O)Mn3+5O10

Synthesis

Crystal System

Monoclinic

Classification

Oxide

Nature

Natural

Crystallinity

Aggregate

Comments

Psilmelane Characteristic Physical Properties

Hardness

5-7

Streak

brownish black to black, shiny

Specific Gravity

6.4-6.45

Toughness

Poor

Inclusions

Psilmelane is sometimes botryoidal and might have pyrolusite bands or swirls.

Luster

Dull To Metallic

Stability

Fracture

Uneven

Cleavage

None

Comments

JTV on Google+
0 Items
My Wish List
Close
Item
Description
Qty.
Price


Estimated Order Total:
0
Total Due Today:
0
Close
Item
Description
Qty.
Price


Page of 1