Investigation of silica polymorphs stratified in siliceous geode using FTIR and XRD methods

Salih Muhammad Awadh; Zaher Mundher Yaseen

doi:10.1016/j.matchemphys.2019.02.048

Investigation of silica polymorphs stratified in siliceous geode using FTIR and XRD methods

Salih Muhammad Awadh, Zaher Mundher Yaseen^*

^*Corresponding author for this work

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

63 Scopus citations

Abstract

The study aims to differentiate the silica forms stratified in the siliceous geodes using infrared spectroscopy (FTIR) and X-ray diffraction (XRD). The water content (total water, H ₂ O _mol and Si-OH) in SiO ₂ . nH ₂ O forms are used as the fingerprint for the different varieties of the silica morphs. For this reason, an irregular botryoidal spherical shape siliceous geode formed from alternative silica forms collected from Early–Late Eocene carbonate sediments of the Ratga Formation located in the Western Desert of Iraq were mineralogically investigated. The FTIR and XRD as authoritative tools that have been used together with the water content to enhance the distinction between crystalline and non-crystalline silica forms. Quartzine, quartz, chalcedony opal-A, opal-C, and opal-CT have been identified in different layers of geode in addition to calcite lining the geode center.

Original language	English
Pages (from-to)	45-50
Number of pages	6
Journal	Materials Chemistry and Physics
Volume	228
DOIs	https://doi.org/10.1016/j.matchemphys.2019.02.048
State	Published - 15 Apr 2019
Externally published	Yes

Bibliographical note

Publisher Copyright:
© 2019 Elsevier B.V.

Keywords

Geode
Ratga Formation
Silanol
Silica form
Spectroscopy

ASJC Scopus subject areas

General Materials Science
Condensed Matter Physics

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10.1016/j.matchemphys.2019.02.048

Cite this

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title = "Investigation of silica polymorphs stratified in siliceous geode using FTIR and XRD methods",

abstract = " The study aims to differentiate the silica forms stratified in the siliceous geodes using infrared spectroscopy (FTIR) and X-ray diffraction (XRD). The water content (total water, H 2 O mol and Si-OH) in SiO 2 . nH 2 O forms are used as the fingerprint for the different varieties of the silica morphs. For this reason, an irregular botryoidal spherical shape siliceous geode formed from alternative silica forms collected from Early–Late Eocene carbonate sediments of the Ratga Formation located in the Western Desert of Iraq were mineralogically investigated. The FTIR and XRD as authoritative tools that have been used together with the water content to enhance the distinction between crystalline and non-crystalline silica forms. Quartzine, quartz, chalcedony opal-A, opal-C, and opal-CT have been identified in different layers of geode in addition to calcite lining the geode center.",

keywords = "Geode, Ratga Formation, Silanol, Silica form, Spectroscopy",

author = "Awadh, \{Salih Muhammad\} and Yaseen, \{Zaher Mundher\}",

note = "Publisher Copyright: {\textcopyright} 2019 Elsevier B.V.",

year = "2019",

month = apr,

day = "15",

doi = "10.1016/j.matchemphys.2019.02.048",

language = "English",

volume = "228",

pages = "45--50",

journal = "Materials Chemistry and Physics",

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T1 - Investigation of silica polymorphs stratified in siliceous geode using FTIR and XRD methods

AU - Awadh, Salih Muhammad

AU - Yaseen, Zaher Mundher

PY - 2019/4/15

Y1 - 2019/4/15

N2 - The study aims to differentiate the silica forms stratified in the siliceous geodes using infrared spectroscopy (FTIR) and X-ray diffraction (XRD). The water content (total water, H 2 O mol and Si-OH) in SiO 2 . nH 2 O forms are used as the fingerprint for the different varieties of the silica morphs. For this reason, an irregular botryoidal spherical shape siliceous geode formed from alternative silica forms collected from Early–Late Eocene carbonate sediments of the Ratga Formation located in the Western Desert of Iraq were mineralogically investigated. The FTIR and XRD as authoritative tools that have been used together with the water content to enhance the distinction between crystalline and non-crystalline silica forms. Quartzine, quartz, chalcedony opal-A, opal-C, and opal-CT have been identified in different layers of geode in addition to calcite lining the geode center.

AB - The study aims to differentiate the silica forms stratified in the siliceous geodes using infrared spectroscopy (FTIR) and X-ray diffraction (XRD). The water content (total water, H 2 O mol and Si-OH) in SiO 2 . nH 2 O forms are used as the fingerprint for the different varieties of the silica morphs. For this reason, an irregular botryoidal spherical shape siliceous geode formed from alternative silica forms collected from Early–Late Eocene carbonate sediments of the Ratga Formation located in the Western Desert of Iraq were mineralogically investigated. The FTIR and XRD as authoritative tools that have been used together with the water content to enhance the distinction between crystalline and non-crystalline silica forms. Quartzine, quartz, chalcedony opal-A, opal-C, and opal-CT have been identified in different layers of geode in addition to calcite lining the geode center.

KW - Geode

KW - Ratga Formation

KW - Silanol

KW - Silica form

KW - Spectroscopy

UR - https://www.scopus.com/pages/publications/85062145903

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DO - 10.1016/j.matchemphys.2019.02.048

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SN - 0254-0584

VL - 228

SP - 45

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JO - Materials Chemistry and Physics

JF - Materials Chemistry and Physics

ER -

Investigation of silica polymorphs stratified in siliceous geode using FTIR and XRD methods

Abstract

Bibliographical note

Keywords

ASJC Scopus subject areas

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