TY - JOUR
T1 - Donpeacorite, (Mn,Mg)MgSi2O6, a new orthopyroxene and its proposed phase relations in the system MnSiO3-MgSiO3- FeSiO3.
AU - Petersen, E. U.
AU - Anovitz, L. M.
AU - Essene, E. J.
PY - 1984
Y1 - 1984
N2 - Donpeacorite, a Mn-rich orthopyroxene Mg1.41Mn0.56Ca0.03Si2O6, occurs with tirodite, tourmaline, ferrian braunite, manganoan dolomite, and hedyphane in a manganiferous pod in the marble units near Balmat, New York. This new mineral has space group symmetry Pbca, and unit cell parameters a 18.384(11), b 8.878(7), c 5.226(3), Z=8, D(meas.) 3.36(1). Biaxially negative, it has refractive indices alpha 1.677(2), beta 1.684(2), gamma 1.692(2), 2Valpha 88o. It is yellow- orange, with vitreous lustre, perfect (110) cleavages and H. approx 5-6, this new orthopyroxene was named for Donald R. Peacor. An indexed powder XRD pattern, a single-crystal XRD structure refinement, and phase diagram analyses are also reported.-J.A.Z.
AB - Donpeacorite, a Mn-rich orthopyroxene Mg1.41Mn0.56Ca0.03Si2O6, occurs with tirodite, tourmaline, ferrian braunite, manganoan dolomite, and hedyphane in a manganiferous pod in the marble units near Balmat, New York. This new mineral has space group symmetry Pbca, and unit cell parameters a 18.384(11), b 8.878(7), c 5.226(3), Z=8, D(meas.) 3.36(1). Biaxially negative, it has refractive indices alpha 1.677(2), beta 1.684(2), gamma 1.692(2), 2Valpha 88o. It is yellow- orange, with vitreous lustre, perfect (110) cleavages and H. approx 5-6, this new orthopyroxene was named for Donald R. Peacor. An indexed powder XRD pattern, a single-crystal XRD structure refinement, and phase diagram analyses are also reported.-J.A.Z.
UR - http://www.scopus.com/inward/record.url?scp=0021360886&partnerID=8YFLogxK
M3 - Article
AN - SCOPUS:0021360886
SN - 0003-004X
VL - 69
SP - 472
EP - 480
JO - American Mineralogist
JF - American Mineralogist
IS - 5-6
ER -