Discovery of Li–bearing sodium amphibole from the Sanbagawa belt, Japan
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- BANNO Yasuyuki
- Geological Survey of Japan, National Institute of Advanced Industrial Science and Technology (AIST)
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- FUKUDA Chihiro
- Gem Research Japan Inc.
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- SHIMOBAYASHI Norimasa
- Department of Geology and Mineralogy, Graduate School of Science, Kyoto University
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- YAMADA Shigeo
- Nichika Incorporated
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説明
<p>Lithium–bearing sodium amphibole (Li2O = 0.01–1.02 wt%) was found in a specimen of schistose manganese ore from the Iimori region in the Sanbagawa metamorphic belt, central Japan. The ore is composed mainly of quartz, albite, amphibole, Na to Na–Ca pyroxene, and braunite. The amphibole occurs as prismatic crystals with lengths of up to 400 µm and consists of a pale–green core and an orange–red rim observed in hand specimen. The chemical formulae of averaged compositions of the core and rim, based on 24(O, OH, F, Cl) with (OH, F, Cl) = (2 − 2Ti) atoms per formula unit, are <br>A(Na0.468K0.448)Σ0.916B(Na1.586Ca0.393Mn2+0.021)Σ2.000<br>C(Mg3.896Mn2+0.124Fe3+0.657Al0.182Ti0.031Li0.106Cu0.004)Σ5.000<br>T(Si7.936Al0.064)Σ8.000O22W[(OH)1.771F0.167O0.062]Σ2.000 and <br>A(K0.576Na0.428)Σ1.004B(Na1.759Ca0.241)Σ2.000<br>C(Mg3.143Mn2+0.332Fe3+0.782Al0.247Mn3+0.081Ti0.053Li0.353Cu0.009)<br>Σ5.000TSi8.000O22W[(OH)1.737F0.157O0.106]Σ2.000, respectively. Consequently, the core amphibole has an intermediate composition between magnesio–arfvedsonite and potassic–magnesio–arfvedsonite, whereas the rim amphibole is potassic–magnesio–arfvedsonite.</p>
収録刊行物
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- Journal of Mineralogical and Petrological Sciences
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Journal of Mineralogical and Petrological Sciences 116 (1), 56-60, 2021
一般社団法人 日本鉱物科学会
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詳細情報 詳細情報について
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- CRID
- 1390850247500178432
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- NII論文ID
- 130007995416
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- ISSN
- 13493825
- 13456296
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- 本文言語コード
- en
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- 資料種別
- journal article
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- データソース種別
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- JaLC
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- OpenAIRE
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