The transformation of nepheline and albite into sodalite in pegmatitic mariupolite of the Oktiabrski Massif (SE Ukraine)

Dumańska-Słowik, Magdalena; Heflik, Wiesław; Pieczka, Adam; Sikorska, Magdalena; Dąbrowa, Łukasz

doi:10.1016/j.saa.2015.06.039

Cited by 10 publications

(2 citation statements)

References 17 publications

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“…Additionally, the glass raw materials may have contained chloride, sulphate or sulphide, which contains S and Cl. The formation of sodalite (Cl-containing sodium aluminosilicate, sometimes contains sulphur) in the dark matrix (Pb-poor) could be attributed to the reaction between sodium aluminosilicate (existing albite or newly-formed nepheline) and the sulphur- and chlorine-based ingredients [ 38 , 39 ].…”

Section: Discussion: Raw Materials Production Technology and Cross-cr...mentioning

confidence: 99%

The production technology of mineral soda alumina glass: A perspective from microstructural analysis of glass beads in Iron Age Taiwan

2022

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Mineral soda alumina (m-Na-Al) glass is a common glass production group found around the Indo-Pacific region. In Iron Age Taiwan, its presence dates back to the early 1st millennium AD. This research discusses m-Na-Al glass beads excavated from Iron Age sites in Taiwan. No production sites for m-Na-Al have been found, but microstructural analysis suggests m-Na-Al glass appears to originate around South Asia and is exchanged widely. SEM-EDS and EPMA were used to analyse red, orange, yellow, green and blue m-Na-Al glass. The microstructure of the glass shows the presence of plagioclase and alkali feldspar relics in the glass, suggesting a low manufacturing temperature. Copper-based colourants are identified in red, orange, blue and green glass, while lead tin oxide is used in yellow and green glass. It appears that various types of copper-containing raw materials were procured by craftspeople, and a self-reduction process for producing red and orange glass is tentatively proposed. Additionally, the microstructure of yellow glass reveals different colouring paths were used. These results increase our understanding of the selection of raw materials, and provide an impetus for further research on the cross craft interaction between glass and copper production.

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Section: Discussion: Raw Materials Production Technology and Cross-cr...mentioning

confidence: 99%

The production technology of mineral soda alumina glass: A perspective from microstructural analysis of glass beads in Iron Age Taiwan

2022

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“…The chemical reactions describing these various transformations were proposed by [9] and then accepted by many scientists, e.g., [10][11][12][13]. According to observations of the alkali-metasomatic replacement of feldspars in experiments and natural metasomatic rock samples [9][10][11][12][13][14], experiments were performed at crustal pressures of 4 kbar, late-igneous to hydrothermal temperatures of 200-800 • C, and a fluid phase of variable salinity. We used a double-capsule technique, where an albite crystal, serving as source for Si, Na, and Al, is physically separated from γ-Al 2 O 3 and material transport occurs via a H 2 O-NaCl fluid.…”

Section: Introductionmentioning

confidence: 99%

Metasomatic Replacement of Albite in Nature and Experiments

Drüppel

Wirth

2018

Minerals

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Replacement of albite by sodium-rich, secondary phases is a common phenomenon, observed in different geological settings and commonly attributed to alkaline metasomatism. We investigated growth of nepheline and sodalite on albite in time series experiments between two and 14 days. A total of 42 hydrothermal experiments were performed in cold-seal hydrothermal vessels at a constant pressure of 4 kbar and 200-800 • C in the system SiO 2 -Al 2 O 3 -NaCl-H 2 O. To allow for fluid flow and material transport, a double-capsule technique was used; hereby, a perforated inner Pt capsule was filled with cleavage fragments of natural albite, whereas the shut outer Au capsule was filled with γ-Al 2 O 3 and the NaCl-H 2 O solution. Complete overgrowth of albite by sodalite and nepheline occurred after just two days of experiments. At high salinity (≥17 wt % NaCl) sodalite is the stable reaction product over the whole temperature range whereas nepheline occurs at a lower relative bulk salinity than sodalite and is restricted to a high temperature of ≥700 • C. The transformation of albite starts along its grain margins, cracks or twin lamellae. Along the reaction front sodalite crystallizes as small euhedral and highly porous grains forming polycrystalline aggregates. Coarse sodalite dominates in the outermost domains of the reaction zones, suggesting recrystallization. Sodalite may contain fluid inclusions with trapped NaCl-rich brine, demonstrating that the interconnected microporosity provides excellent pathways for fluid-assisted material transport. Highly porous nepheline forms large, euhedral crystals with rectangular outline. Sodalite and nepheline in natural rock samples display only minor porosity but fluid and secondary mineral inclusions, pointing to coarsening of a previously present microporosity. The reaction interface between sodalite and albite in natural rock samples is marked by open channels in transmission electron microscopy. In many of the experiments, a zone of Si-H-rich, amorphous material is developed at the reaction front, which occurs at a temperature of up to of 750 • C as nanometer to 350 µm wide reaction zone around albite. This change in composition corresponds with the abrupt termination of the crystalline feldspar structure. The presence of sodalite as micro-to nanometer-sized, euhedral crystals within the amorphous zone demonstrates, that both the sodalite reaction rim and the amorphous material allow for fluid-assisted material transport between the crystalline albite (release of Si, Al) and the bulk fluid (H 2 O, Na, Cl). This texture, moreover, suggests that the amorphous phase represents a metastable interstage reaction product, which is progressively replaced by sodalite and nepheline. Remarkably, product sodalite, nepheline, and the amorphous material largely inherit the trace element budget of the respective ancestor albite, indicating that at least part of the trace elements remained fixed during the reaction process. The observed reaction textures in both natural and experim...

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Is spodumene flotation tailings suitable for the preparation of ceramics?

Yang

Xue

et al. 2022

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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The transformation of nepheline and albite into sodalite in pegmatitic mariupolite of the Oktiabrski Massif (SE Ukraine)

Cited by 10 publications

References 17 publications

The production technology of mineral soda alumina glass: A perspective from microstructural analysis of glass beads in Iron Age Taiwan

The production technology of mineral soda alumina glass: A perspective from microstructural analysis of glass beads in Iron Age Taiwan

Metasomatic Replacement of Albite in Nature and Experiments

Is spodumene flotation tailings suitable for the preparation of ceramics?

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