Orange pickeringite from the algares 30-level adit, aljustrel mine, iberian pyrite belt, portugal

Teresa P. Silva; João X. Matos; Daniel de Oliveira; Igor Morais; Pedro Gonçalves; Luís Albardeiro; Fernanda Carvalho; Ugur D. Menda; João P. Veiga

doi:10.3390/min11101115

Orange pickeringite from the algares 30-level adit, aljustrel mine, iberian pyrite belt, portugal

Teresa P. Silva, João X. Matos, Daniel de Oliveira, Igor Morais, Pedro Gonçalves, Luís Albardeiro, Fernanda Carvalho, Ugur D. Menda, João P. Veiga

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Abstract

The sheltered environment of the Algares +30 level adit (underground mine gallery) contributes to the preservation of secondary water-soluble minerals formed on the tunnel walls. The massive sulphide and related stockwork zone are hosted by the Mine Tuff volcanic unit and are exposed in the walls of the gallery, showing intense oxidation and hydrothermal alteration. Minerals from the halotrichite group were identified on the efflorescent salts, typically white fine-acicular crystals but also on aggregates with dark orange/brownish colour. Mineral characterization was performed using several methods and analytical techniques (XRD, XRF-WDS, SEM-EDS, DTA-TG), and the chemical formulas were calculated maintaining the ratio A:B^∼= 1:2 in accordance with the general formula of the halotrichite group, AB₂ (SO₄ )₄·22H₂ O. This methodology allowed the assignment of the orange colour to the presence of trivalent iron on iron-rich pickeringite in partial substitution of aluminium.

Original language	English
Article number	1115
Journal	Minerals
Volume	11
Issue number	10
DOIs	https://doi.org/10.3390/min11101115
Publication status	Published - 11 Oct 2021

Keywords

Algares mine
Efflorescent minerals
Halotrichite
Iberian Pyrite Belt sulphide ores
Orange pickeringite
Underground mining

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minerals-11-01115-v2Final published version, 21.3 MBLicence: CC BY

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title = "Orange pickeringite from the algares 30-level adit, aljustrel mine, iberian pyrite belt, portugal",

abstract = "The sheltered environment of the Algares +30 level adit (underground mine gallery) contributes to the preservation of secondary water-soluble minerals formed on the tunnel walls. The massive sulphide and related stockwork zone are hosted by the Mine Tuff volcanic unit and are exposed in the walls of the gallery, showing intense oxidation and hydrothermal alteration. Minerals from the halotrichite group were identified on the efflorescent salts, typically white fine-acicular crystals but also on aggregates with dark orange/brownish colour. Mineral characterization was performed using several methods and analytical techniques (XRD, XRF-WDS, SEM-EDS, DTA-TG), and the chemical formulas were calculated maintaining the ratio A:B∼= 1:2 in accordance with the general formula of the halotrichite group, AB2 (SO4 )4·22H2 O. This methodology allowed the assignment of the orange colour to the presence of trivalent iron on iron-rich pickeringite in partial substitution of aluminium.",

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AU - Gonçalves, Pedro

AU - Albardeiro, Luís

AU - Carvalho, Fernanda

AU - Menda, Ugur D.

AU - Veiga, João P.

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N2 - The sheltered environment of the Algares +30 level adit (underground mine gallery) contributes to the preservation of secondary water-soluble minerals formed on the tunnel walls. The massive sulphide and related stockwork zone are hosted by the Mine Tuff volcanic unit and are exposed in the walls of the gallery, showing intense oxidation and hydrothermal alteration. Minerals from the halotrichite group were identified on the efflorescent salts, typically white fine-acicular crystals but also on aggregates with dark orange/brownish colour. Mineral characterization was performed using several methods and analytical techniques (XRD, XRF-WDS, SEM-EDS, DTA-TG), and the chemical formulas were calculated maintaining the ratio A:B∼= 1:2 in accordance with the general formula of the halotrichite group, AB2 (SO4 )4·22H2 O. This methodology allowed the assignment of the orange colour to the presence of trivalent iron on iron-rich pickeringite in partial substitution of aluminium.

AB - The sheltered environment of the Algares +30 level adit (underground mine gallery) contributes to the preservation of secondary water-soluble minerals formed on the tunnel walls. The massive sulphide and related stockwork zone are hosted by the Mine Tuff volcanic unit and are exposed in the walls of the gallery, showing intense oxidation and hydrothermal alteration. Minerals from the halotrichite group were identified on the efflorescent salts, typically white fine-acicular crystals but also on aggregates with dark orange/brownish colour. Mineral characterization was performed using several methods and analytical techniques (XRD, XRF-WDS, SEM-EDS, DTA-TG), and the chemical formulas were calculated maintaining the ratio A:B∼= 1:2 in accordance with the general formula of the halotrichite group, AB2 (SO4 )4·22H2 O. This methodology allowed the assignment of the orange colour to the presence of trivalent iron on iron-rich pickeringite in partial substitution of aluminium.

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JF - Minerals

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Orange pickeringite from the algares 30-level adit, aljustrel mine, iberian pyrite belt, portugal

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