Psilomelane Cabochon, 42.20 cts.

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: 42.20 caratsLength: 27.37 mmWidth: 18.17 mmHeight: 6.10 mm Group: Hydrous Manganese Oxide-Species: Romanèchite-Pyrolusite--Variety: -Trade Name(s): Psilomelane, Black Hematite*Origin: AustraliaEnhancement(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 Enh