-
- KUSACHI Isao
- Department of Earth Sciences, Faculty of Education, Okayama University
-
- HENMI Chiyoko
- Department of Earth Sciences, Faculty of Science, Okayama University
-
- KOBAYASHI Shoichi
- Division of Earth Sciences, Kurashiki University of Science and the Arts
この論文をさがす
抄録
Frolovite was found in a vein consisting of borate minerals which developed along the boundary between crystalline limestone and skarns at Fuka, Okayama Prefecture. Frolovite occurred as aggregates of granular crystals up to 0.15 mm long and 0.05 mm wide, in association with olshanskyite and calcite. Wet analyses and EPMA gave the empirical formula C a0.998B2.008O8H7.981 on the basis of O=8, which was consistent with the formula Ca[B(OH)4]2 reported by Simonov et al. (1976). X-ray powder data for frolovite from Fuka were determined with accuracy. The reflections were indexed on the triclinic cell reported by Simonov et al. (1976). The unit cell parameters are a=7.764(4), b=5.679(4), c=8.126(5)Å, α=113.15(1), β=101.604(7) and γ=107.86(1)°. It was optically biaxial negative with refractive indices α=1.561, β=1.573, γ=1.584; VHN25 =168 kg/mm2 and a measured density of 2.22 g/cm3.<BR>It is likely that frolovite at Fuka was formed by an alteration of olshanskyite, where the Ca ion had been removed and water had been added at a low temperature of around 70°C.
収録刊行物
-
- Mineralogical Journal
-
Mineralogical Journal 17 (7), 330-337, 1995
一般社団法人 日本鉱物科学会
- Tweet
詳細情報 詳細情報について
-
- CRID
- 1390282681522717696
-
- NII論文ID
- 130004485169
- 30027161530
-
- NII書誌ID
- AA00739590
-
- COI
- 1:CAS:528:DyaK28Xjtlehtbw%3D
-
- ISSN
- 18814174
- 05442540
- http://id.crossref.org/issn/05442540
-
- 本文言語コード
- en
-
- データソース種別
-
- JaLC
- Crossref
- CiNii Articles
-
- 抄録ライセンスフラグ
- 使用不可