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occurs naturally

as the mineral brucite

magnesium hydroxide in its natural form is called brucite


  • American mineralogist, Archibald Bruce, first discovered brucite. It was formally named in his honor in1824.

  • Brucite is the rarest form of magnesium hydroxide due to the access and cost of mining its ore.  

  • Formed by thermal dedolomitization or thermal decomposition of magnesite, it is then ultimately hydrated to form the mineral brucite.


  • white, gray, or pale blue/green in color; sometimes its color is yellow to brownish-red

  • waxy appearance, crystalline texture

  • molecular weight = 58.32g/mol

  • composition

    • ≈ 42% magnesium​

    • ≈ 3% hydrogen

    • ≈ 55% oxygen

  • natural brucite tends to have more impurities than synthetic magnesium hydroxide

notable deposits.

  • Canada

  • China*

  • Italy

  • Pakistan

  • Russia*

  • South Africa

  • Sweden

  • United States

*currently active

potential applications.

  • a pH buffer and alkalinity source

  • helps to neutralize acidity

  • processed to a powder or slurry

  • size options to provide various surface area

  • alkalinity source with low reaction

  • non-hazardous

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