The mica group represents 37 phyllosilicate minerals that have a layered or platy texture.  The commercially important micas are muscovite and phlogopite.  Layering in the univalent (potassium, sodium), or true, micas imparts perfect basal cleavage, allowing crystals to be split into very thin sheets that are tough and flexible.  Layering in the divalent, or brittle, micas also results in perfect basal cleavage; the greater bond strengths, however, make them more brittle and less flexible.  Mica sheets are also transparent to opaque, resilient, reflective, refractive, dielectric, chemically inert, insulating, lightweight, and hydrophilic.  Mica also is stable when exposed to electricity, light, moisture, and extreme temperatures.

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Annual Publications

Mineral Commodity Summaries

• Mica (Natural)
    PDF Format:
       | 2011 |2012 |2013 |2014 |2015 |2016 |2017 |2018 | 2019 | 2020 | 2021 |
• Mica (Natural), Scrap and Flake
    PDF Format:
       | 1996 | 1997 | 1998 | 1999 | 2000 | 2001 | 2002 | 2003 | 2004 | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 |
• Mica (Natural), Sheet
    PDF Format:
       | 1996 | 1997 | 1998 | 1999 | 2000 | 2001 | 2002 | 2003 | 2004 | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 |
• Appendixes

Minerals Yearbook

• Mica
    PDF Format:
       | 1994 | 1995 | 1996 | 1997 | 1998 | 1999 | 2000 | 2001 | 2002 | 2003 | 2004 | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 | 2012 | 2013 | 2014 | 2015 | 2016 | 2017 | 2018 |
    XLS Format:
       | 2002 | 2003 | 2004 | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 | 2012 | 2013 | 2014 | 2015 | 2016 | 2017 | 2018 | 2019 tables-only release |
• Archive
       | 1932-1993 |

Special Publications

• Historical Statistics for Mineral and Material Commodities in the United States
  Data Series 140
  • Mica
• U.S. Mineral Dependence - Statistical Compilation of U.S. and World Mineral Production, Consumption, and Trade, 1990-2010
  Open-File Report 2013-1184