- journal_title：American Mineralogist
- Contributor：Toshimori Sekine ; Hongliang He ; Takamichi Kobayashi ; Akira Yamaguchi
- Publisher：Mineralogical Society of America
- Date：2006-
- Format：text/html
- Language：en
- Identifier：10.2138/am.2006.2129
- journal_abbrev：American Mineralogist
- issn：0003-004X
- volume：91
- issue：11-12
- firstpage：1802
- section：Articles
Hugoniot equation-of-state and release adiabat results are presented for magnesite to a pressure of ~140 GPa. A sharp change in the shock velocity and particle velocity relation suggests that a phase transition to a high-pressure phase occurs at 107±10 GPa. Decomposition of magnesite was observed by abrupt volume expansion during the pressure release from a pressure over the phase transition and by investigating post-shock magnesites recovered from hypervelocity impacts of mini-flyers performed using a laser-driven acceleration. Post-shock magnesites above 95 GPa contained MgO crystallites and the amount of MgO increased with increasing shock pressure.