Single crystal elasticity of lawsonite

Stanislav V. Sinogeikin; Frank R. Schilling; Jay D. Bass

doi:10.2138/am-2000-11-1230

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Letter| November 01, 2000

Single crystal elasticity of lawsonite

Stanislav V. Sinogeikin;

Stanislav V. Sinogeikin *

Department of Geology, University of Illinois, Urbana, Illinois 61801, U.S.A.

*

E-mail: [email protected]

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Frank R. Schilling;

Frank R. Schilling

Department of Geology, University of Illinois, Urbana, Illinois 61801, U.S.A.

†

Permanent address: GeoForschungsZentrum Potsdam, Telegrafenberg, 14473 Potsdam, Germany

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Jay D. Bass

Department of Geology, University of Illinois, Urbana, Illinois 61801, U.S.A.

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Author and Article Information

Stanislav V. Sinogeikin *

Department of Geology, University of Illinois, Urbana, Illinois 61801, U.S.A.

Frank R. Schilling

†

Permanent address: GeoForschungsZentrum Potsdam, Telegrafenberg, 14473 Potsdam, Germany

Department of Geology, University of Illinois, Urbana, Illinois 61801, U.S.A.

Jay D. Bass

Department of Geology, University of Illinois, Urbana, Illinois 61801, U.S.A.

*

E-mail: [email protected]

Publisher: Mineralogical Society of America

Received: 25 Jul 2000

Accepted: 16 Aug 2000

First Online: 09 Mar 2017

Online ISSN: 1945-3027

Print ISSN: 0003-004X

American Mineralogist (2000) 85 (11-12): 1834–1837.

https://doi.org/10.2138/am-2000-11-1230

Abstract

The single-crystal elastic moduli of lawsonite [CaAl₂(Si₂O₇)(OH)₂·H₂O] were measured by Brillouin spectroscopy at ambient conditions. The Voigt-Reuss-Hill averaged aggregate elastic moduli are K_S = 125(2) GPa and μ = 52(2) GPa, for the adiabatic bulk modulus and shear modulus, respectively. Our acoustic results resolve discrepancies between the bulk moduli obtained in earlier compression studies. Lawsonite has distinctive acoustic properties, being characterized by extremely high shear elastic anisotropy (74%), a high V_P to V_S ratio (V_P/V_S = 1.94), and a large Poisson’s ratio (σ = 0.318).