TY - JOUR
T1 - Chrysoprase from Warrawanda, western Australia
AU - Nagase, Toshiro
AU - Akizuki, Mizuhiko
AU - Onoda, Masataka
AU - Sato, Masanobu
PY - 1997
Y1 - 1997
N2 - Chrysoprase from Warrawanda, West Australia, was observed using optical and transmission electron microscopies (TEM), Fourier transformation infrared spectroscopy (FT-IR) and electron microprobe analyses (EPMA). It was tried to identify origin of the green colour. TEM observations and IR-spectra analyses show that the chrysoprase includes kerolite, which occurs as a cotton-like aggregate of extremely fine-grained crystals at the boundaries of quartz grains and in quartz crystals. EPMA analyses show that the kerolite contains about 10 wt % NiO, and that NiO content of the chrysoprase increases with the degree of silicification of the surrounding serpentinite. The Ni-bearing kerolite derived from the silicified serpentine is inferred to cause the green colour of the chrysoprase.
AB - Chrysoprase from Warrawanda, West Australia, was observed using optical and transmission electron microscopies (TEM), Fourier transformation infrared spectroscopy (FT-IR) and electron microprobe analyses (EPMA). It was tried to identify origin of the green colour. TEM observations and IR-spectra analyses show that the chrysoprase includes kerolite, which occurs as a cotton-like aggregate of extremely fine-grained crystals at the boundaries of quartz grains and in quartz crystals. EPMA analyses show that the kerolite contains about 10 wt % NiO, and that NiO content of the chrysoprase increases with the degree of silicification of the surrounding serpentinite. The Ni-bearing kerolite derived from the silicified serpentine is inferred to cause the green colour of the chrysoprase.
KW - Chrysoprase
KW - Kerolite
KW - Quartz
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U2 - 10.1127/njmm/1997/1997/289
DO - 10.1127/njmm/1997/1997/289
M3 - Article
AN - SCOPUS:0031482969
SP - 289
EP - 300
JO - Neues Jahrbuch Fur Mineralogie, Monatshefte
JF - Neues Jahrbuch Fur Mineralogie, Monatshefte
SN - 0028-3649
IS - 7
ER -