Calcium and Magnesium-bearing Sabugalite from the Tono Uranium Deposit, Central Japan

Masataka Nakata; Eiji Sasao; Kosei Komuro

doi:10.1111/rge.12019

Calcium and Magnesium-bearing Sabugalite from the Tono Uranium Deposit, Central Japan

Masataka Nakata^*, Eiji Sasao, Kosei Komuro

^*Corresponding author for this work

Earth System Science

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

Abstract

Calcium and magnesium-bearing sabugalite occurs as aggregations of yellowish platy crystals in veinlets or druses in conglomerate from the oxidized parts of the Tono uranium deposit, Central Japan. X-ray powder diffractometry of this mineral has reflections consistent with previous powder diffraction data of sabugalite. It is included in the monoclinic system with space group C2/m and calculated cell parameters of a = 19.68Å, b = 9.89Å, c = 9.82Å α = γ = 90°, β-96.93° and V = 1897.83Å³. Chemical analysis yields a formula of (Ca_0.10Mg_0.09)_Σ0.19Al_0.53(UO₂)_2.04((PO₄)_1.99(AsO₄)_0.01)_Σ2.00·11.22H₂O. EMPA mapping shows that the mineral is compositionally uniform with no micron-scale layering. Charge of cations including Ca and Mg in the cation-H₂O layer is 1.98 being identical to that of autunite group minerals. This suggests that the charge balance in the cation-H₂O layer of the mineral could be made by the alkaline earth or alkaline elements rather than by hydrogen ions.

Original language	English
Pages (from-to)	404-411
Number of pages	8
Journal	Resource Geology
Volume	63
Issue number	4
DOIs	https://doi.org/10.1111/rge.12019
State	Published - 2013/10

Keywords

Chemical composition
Sabugalite
Tono Uranium Deposit

ASJC Scopus subject areas

Geology
Geochemistry and Petrology

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10.1111/rge.12019

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@article{4fad247e56604d82ba1bbd93ab9d658c,

title = "Calcium and Magnesium-bearing Sabugalite from the Tono Uranium Deposit, Central Japan",

abstract = "Calcium and magnesium-bearing sabugalite occurs as aggregations of yellowish platy crystals in veinlets or druses in conglomerate from the oxidized parts of the Tono uranium deposit, Central Japan. X-ray powder diffractometry of this mineral has reflections consistent with previous powder diffraction data of sabugalite. It is included in the monoclinic system with space group C2/m and calculated cell parameters of a = 19.68{\AA}, b = 9.89{\AA}, c = 9.82{\AA} α = γ = 90°, β-96.93° and V = 1897.83{\AA}3. Chemical analysis yields a formula of (Ca0.10Mg0.09)Σ0.19Al0.53(UO2)2.04((PO4)1.99(AsO4)0.01)Σ2.00·11.22H2O. EMPA mapping shows that the mineral is compositionally uniform with no micron-scale layering. Charge of cations including Ca and Mg in the cation-H2O layer is 1.98 being identical to that of autunite group minerals. This suggests that the charge balance in the cation-H2O layer of the mineral could be made by the alkaline earth or alkaline elements rather than by hydrogen ions.",

keywords = "Chemical composition, Sabugalite, Tono Uranium Deposit",

author = "Masataka Nakata and Eiji Sasao and Kosei Komuro",

year = "2013",

month = oct,

doi = "10.1111/rge.12019",

language = "英語",

volume = "63",

pages = "404--411",

journal = "Resource Geology",

issn = "1344-1698",

publisher = "John Wiley and Sons Inc.",

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TY - JOUR

T1 - Calcium and Magnesium-bearing Sabugalite from the Tono Uranium Deposit, Central Japan

AU - Nakata, Masataka

AU - Sasao, Eiji

AU - Komuro, Kosei

PY - 2013/10

Y1 - 2013/10

N2 - Calcium and magnesium-bearing sabugalite occurs as aggregations of yellowish platy crystals in veinlets or druses in conglomerate from the oxidized parts of the Tono uranium deposit, Central Japan. X-ray powder diffractometry of this mineral has reflections consistent with previous powder diffraction data of sabugalite. It is included in the monoclinic system with space group C2/m and calculated cell parameters of a = 19.68Å, b = 9.89Å, c = 9.82Å α = γ = 90°, β-96.93° and V = 1897.83Å3. Chemical analysis yields a formula of (Ca0.10Mg0.09)Σ0.19Al0.53(UO2)2.04((PO4)1.99(AsO4)0.01)Σ2.00·11.22H2O. EMPA mapping shows that the mineral is compositionally uniform with no micron-scale layering. Charge of cations including Ca and Mg in the cation-H2O layer is 1.98 being identical to that of autunite group minerals. This suggests that the charge balance in the cation-H2O layer of the mineral could be made by the alkaline earth or alkaline elements rather than by hydrogen ions.

AB - Calcium and magnesium-bearing sabugalite occurs as aggregations of yellowish platy crystals in veinlets or druses in conglomerate from the oxidized parts of the Tono uranium deposit, Central Japan. X-ray powder diffractometry of this mineral has reflections consistent with previous powder diffraction data of sabugalite. It is included in the monoclinic system with space group C2/m and calculated cell parameters of a = 19.68Å, b = 9.89Å, c = 9.82Å α = γ = 90°, β-96.93° and V = 1897.83Å3. Chemical analysis yields a formula of (Ca0.10Mg0.09)Σ0.19Al0.53(UO2)2.04((PO4)1.99(AsO4)0.01)Σ2.00·11.22H2O. EMPA mapping shows that the mineral is compositionally uniform with no micron-scale layering. Charge of cations including Ca and Mg in the cation-H2O layer is 1.98 being identical to that of autunite group minerals. This suggests that the charge balance in the cation-H2O layer of the mineral could be made by the alkaline earth or alkaline elements rather than by hydrogen ions.

KW - Chemical composition

KW - Sabugalite

KW - Tono Uranium Deposit

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U2 - 10.1111/rge.12019

DO - 10.1111/rge.12019

M3 - 学術論文

AN - SCOPUS:84884714232

SN - 1344-1698

VL - 63

SP - 404

EP - 411

JO - Resource Geology

JF - Resource Geology

IS - 4

ER -

Calcium and Magnesium-bearing Sabugalite from the Tono Uranium Deposit, Central Japan

Abstract

Keywords

ASJC Scopus subject areas

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