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A soft decomposed limestone, used in powder form as a polishing material.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


(Geological Science) a much-weathered limestone, rich in silica: used in powdered form for polishing metal
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


(ˈrɒt nˌstoʊn)

a decomposed siliceous limestone, used as a powder for polishing metals.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.rottenstone - a weathered and decomposed siliceous limestone; in powdered form it is used in polishing
limestone - a sedimentary rock consisting mainly of calcium that was deposited by the remains of marine animals
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.
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The next step is to anoint the wood with rottenstone. Wipe a small amount on evenly with your hand and then rub or polish the stock with a soft cloth.
My usual method calls for mixing Pilkington's Stock Rubbing Oil (clear linseed oil) with Rottenstone (a Brownells brand which I had on hand) on a felt pad and rubbing out the stock.