Pyrolusite
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Item # PYRO02146641
Pyrolusite from Alberta, Michigan

$24.00
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Pyrolusite is a common manganese mineral, manganese dioxide, (MnO2) that constitutes an important ore. Its name is
from the Greek for
fire and to wash (in reference to its use as a way to remove tints from glass). It is always formed
under highly oxidizing conditions, it forms light-gray to black, metallic, moderately heavy coatings, crusts, or fibers that
are alteration products of other manganese ores, bogs, lakes, or deposits left by circulating waters. Pyrolusite is mined
in Germany, Brazil, India, the United States, Cuba, Morocco, and South Africa. Pyrolusite is used in the manufacture of
steel, manganese bronze, battery dry cells and as a decolorizing agent in glass.

For more information go to     
http://en.wikipedia.org/wiki/Pyrolusite
Nice metallic Pyrolusite acicular fan pattern crystals on banded Chert with
Goethite. This specimen is from the Taylor Mine near Alberta, Baraga County,
Michigan.  Alberta was once owned by the Ford Company. The Alberta
sawmill supplied the wooden sides of Henry Ford’s Model T's.

weighs 7.6oz or 0.48lb (217g) and measures 3.5 x 2.2 x 1 inch (9 x 5.8 x 2.7cm)