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Raley Design Studios

Psilomelane Cabochon, 16.35 cts.

Psilomelane Cabochon, 16.35 cts.

Regular price $16.00 USD
Regular price Sale price $16.00 USD
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Shipping calculated at checkout.

This material typically exhibits swirls and alternating layers of black Romanèchite and gray Pyrolusite, both of which are a manganese oxide and can achieve a submetallic lustre (almost mirror finish).  This stone appears to be mostly Pyrolusite and has a subtle botryoidal formation pattern when examined closely.  Flat, semi-polished back with a beveled edge for ease of setting.  You will receive the exact gemstone shown in photos.

Weight: 16.35 carats
Length: 17.39 mm
Width: 12.66 mm
Height: 5.09 mm

Group: Hydrous Manganese Oxide
-Species: Romanèchite-Pyrolusite
--Variety: -
Trade Name(s): Psilomelane, Black Hematite*
Origin: Australia
Enhancement(s): (N) Natural

* Using the term "black hematite" to describe Psilomelane is deceptive and a punishable crime under US Federal Trade Commission regulations. Hematite is an Iron oxide with a different chemical makeup.

American Gem Trade Association Gemstone Enhancement Codes

Enhancement: Any treatment process other than cutting and polishing that improves the appearance (color/clarity/phenomena), durability, or availability of a gemstone.

(N) Natural
No modification; natural stones which are not currently known to be enhanced (or currently has no known modification process).


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