Comparative compressibilities of majorite-type garnets

R. M. Hazen; R. T. Downs; P. G. Conrad; L. W. Finger; T. Gasparik

doi:10.1007/BF00202099

Comparative compressibilities of majorite-type garnets

R. M. Hazen, R. T. Downs, P. G. Conrad, L. W. Finger, T. Gasparik

Geosciences

Research output: Contribution to journal › Article › peer-review

69 Scopus citations

Abstract

Relative compressibilities of five silicate garnets were determined by single-crystal x-ray diffraction on crystals grouped in the same high-pressure mount. The specimens include a natural pyrope [(Mg_2.84Fe_0.10Ca_0,06) Al₂Si₃O₁₂], and four synthetic specimens with octahedrally-coordinated silicon: majorite [Mg₃(MgSi)Si₃O₁₂], calcium-bearing majorite [(Ca_0.49Mg_2.51)(MgSi)Si₃0₁₂], sodium majorite [(Na_1.88Mgp_0.12)(Mg_0.06Si_1.94)Si₃O₁₂], and an intermediate composition [(Na_0.37Mg_2.48)(Mg_0.13Al_1.07 Si₀₈₀) Si₃O₁₂]. Small differences in the compressibilities of these crystals are revealed because they are subjected simultaneously to the same pressure. Bulk-moduli of the garnets range from 164.8 ± 2.3 GPa for calcium majorite to 191.5 ± 2.5 GPa for sodium majorite, assuming K′=4. Two factors, molar volume and octahedral cation valence, appear to control garnet compression.

Original language	English (US)
Pages (from-to)	344-349
Number of pages	6
Journal	Physics and Chemistry of Minerals
Volume	21
Issue number	5
DOIs	https://doi.org/10.1007/BF00202099
State	Published - Sep 1994

ASJC Scopus subject areas

General Materials Science
Geochemistry and Petrology

Access to Document

10.1007/BF00202099

Cite this

@article{89c719855f97421e823032292bb01bb9,

title = "Comparative compressibilities of majorite-type garnets",

abstract = "Relative compressibilities of five silicate garnets were determined by single-crystal x-ray diffraction on crystals grouped in the same high-pressure mount. The specimens include a natural pyrope [(Mg2.84Fe0.10Ca0,06) Al2Si3O12], and four synthetic specimens with octahedrally-coordinated silicon: majorite [Mg3(MgSi)Si3O12], calcium-bearing majorite [(Ca0.49Mg2.51)(MgSi)Si3012], sodium majorite [(Na1.88Mgp0.12)(Mg0.06Si1.94)Si3O12], and an intermediate composition [(Na0.37Mg2.48)(Mg0.13Al1.07 Si080) Si3O12]. Small differences in the compressibilities of these crystals are revealed because they are subjected simultaneously to the same pressure. Bulk-moduli of the garnets range from 164.8 ± 2.3 GPa for calcium majorite to 191.5 ± 2.5 GPa for sodium majorite, assuming K′=4. Two factors, molar volume and octahedral cation valence, appear to control garnet compression.",

author = "Hazen, \{R. M.\} and Downs, \{R. T.\} and Conrad, \{P. G.\} and Finger, \{L. W.\} and T. Gasparik",

year = "1994",

month = sep,

doi = "10.1007/BF00202099",

language = "English (US)",

volume = "21",

pages = "344--349",

journal = "Physics and Chemistry of Minerals",

issn = "0342-1791",

publisher = "Springer Verlag",

number = "5",

}

TY - JOUR

T1 - Comparative compressibilities of majorite-type garnets

AU - Hazen, R. M.

AU - Downs, R. T.

AU - Conrad, P. G.

AU - Finger, L. W.

AU - Gasparik, T.

PY - 1994/9

Y1 - 1994/9

N2 - Relative compressibilities of five silicate garnets were determined by single-crystal x-ray diffraction on crystals grouped in the same high-pressure mount. The specimens include a natural pyrope [(Mg2.84Fe0.10Ca0,06) Al2Si3O12], and four synthetic specimens with octahedrally-coordinated silicon: majorite [Mg3(MgSi)Si3O12], calcium-bearing majorite [(Ca0.49Mg2.51)(MgSi)Si3012], sodium majorite [(Na1.88Mgp0.12)(Mg0.06Si1.94)Si3O12], and an intermediate composition [(Na0.37Mg2.48)(Mg0.13Al1.07 Si080) Si3O12]. Small differences in the compressibilities of these crystals are revealed because they are subjected simultaneously to the same pressure. Bulk-moduli of the garnets range from 164.8 ± 2.3 GPa for calcium majorite to 191.5 ± 2.5 GPa for sodium majorite, assuming K′=4. Two factors, molar volume and octahedral cation valence, appear to control garnet compression.

AB - Relative compressibilities of five silicate garnets were determined by single-crystal x-ray diffraction on crystals grouped in the same high-pressure mount. The specimens include a natural pyrope [(Mg2.84Fe0.10Ca0,06) Al2Si3O12], and four synthetic specimens with octahedrally-coordinated silicon: majorite [Mg3(MgSi)Si3O12], calcium-bearing majorite [(Ca0.49Mg2.51)(MgSi)Si3012], sodium majorite [(Na1.88Mgp0.12)(Mg0.06Si1.94)Si3O12], and an intermediate composition [(Na0.37Mg2.48)(Mg0.13Al1.07 Si080) Si3O12]. Small differences in the compressibilities of these crystals are revealed because they are subjected simultaneously to the same pressure. Bulk-moduli of the garnets range from 164.8 ± 2.3 GPa for calcium majorite to 191.5 ± 2.5 GPa for sodium majorite, assuming K′=4. Two factors, molar volume and octahedral cation valence, appear to control garnet compression.

UR - https://www.scopus.com/pages/publications/0028564339

UR - https://www.scopus.com/inward/citedby.url?scp=0028564339&partnerID=8YFLogxK

U2 - 10.1007/BF00202099

DO - 10.1007/BF00202099

M3 - Article

AN - SCOPUS:0028564339

SN - 0342-1791

VL - 21

SP - 344

EP - 349

JO - Physics and Chemistry of Minerals

JF - Physics and Chemistry of Minerals

IS - 5

ER -

Comparative compressibilities of majorite-type garnets

Abstract

ASJC Scopus subject areas

Access to Document

Other files and links

Fingerprint

Cite this