### Abstract

The lattice parameters of brucite, Mg(OH)_{2}, have been measured between 20 and 310°C at atmospheric pressure. The thermal expansion is strongly anisotropic with a high coefficient of linear expansion (α_{3}) parallel to the z axis. This leads to an overall volume coefficient of expansion (average of 10.9 × 10^{-5}/K) that is several times greater than estimates based on amphiboles and other hydrous minerals. Individual expansion coefficients are α_{1} = α_{2} = 1.73 × 10^{-5} - 0.13 × 10^{-7}T ± 0.17 × 10^{-5}, α_{3} = 3.23 × 10^{-5} + 2.65 × 10^{-7}T ± 0.32 × 10^{-5}, and α_{vol} = 6.70 × 10^{-5} + 2.37 × 10^{-7}T ± 0.67 × 10^{-5}, where T is the temperature between 20 and 310°C. -Authors

Original language | English |
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Pages (from-to) | 1129-1132 |

Number of pages | 4 |

Journal | American Mineralogist |

Volume | 77 |

Issue number | 9-10 |

Publication status | Published - 1992 |

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## Cite this

*American Mineralogist*,

*77*(9-10), 1129-1132.