Palygorskite in the Regolith from the Mokau District, North Island, New Zealand

Kirkman, J. H.; Wallace, Robert C.

doi:10.1180/claymin.1994.029.2.12

Cited by 4 publications

(1 citation statement)

References 22 publications

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“…However, records offibers 0.03 to OiIum (30 -100 nm) in diameter are fairly common (Serratosa 1979;Botha and Hughes 1992;Eee and Coban 1994;Kirkman and Wallace 1994;Gehring et aI. 1995;Singer et al 1995 Rossi and Cai'iaveras, (1999).…”

Section: Sepiolite and Palygorskitementioning

confidence: 99%

Nanostructure of palygorskite/sepiolite in Texas caliche: Possible bacterial origin

Folk

Rasbury

2007

Carbonates Evaporites

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In a caliche from west Texas, watermelon-shaped calcite crystals arc.coated with fibers of palygorskite/sepiolite clay, which also extend out into pore spaces as spiky filaments. Some filaments arc smooth and capped by ovoid 30 -1OOnm beads. Other filaments arc made of rosary-like chains of beads. These objcets arc seen both in gold-coated and carbon-coated samples, thus are not artifacts. Wc suggest that these minute features were cells of nannobacteria (dwarf forms) that precipitated the clay filaments, in a similar manner as larger bacteria that accumulate clay minerals on their negatively-charged cell walls.

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Section: Sepiolite and Palygorskitementioning

confidence: 99%

Nanostructure of palygorskite/sepiolite in Texas caliche: Possible bacterial origin

Folk

Rasbury

2007

Carbonates Evaporites

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Erionite asbestiform fibres and health risk in Aotearoa/New Zealand: A research note

Patel

Brook

2021

N Z Geog

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Erionite is a naturally‐occurring fibrous zeolite mineral present in some rocks and soils. It is usually found in volcanic ash altered by weathering and groundwater, and recrystallised as zeolite. It is an “asbestiform” because it forms mineral fibres, and like asbestos, if inhaled, can lead to diseases like malignant mesothelioma (MM). Nevertheless, erionite is generally acknowledged as being more carcinogenic than asbestos minerals. Aotearoa/New Zealand has one of the highest MM rates in the western world. We describe preliminary results from erionite in Auckland, provide observations about asbestiform fibres and disease in the Aotearoa‐Pacific Island region, and briefly outline avenues for research.

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Origin and Mineralogy of Sepiolite and Palygorskite From the Tuluanshan Formation, Eastern Taiwan

Wang

Tseng

Chang

et al. 2009

Clays and clay miner.

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The Tuluanshan Formation of the eastern Coastal Range of Taiwan overlies an andesitic core complex presumed to be the source of hydrothermal fluids responsible for the Si- and Mg-rich mineralization of sepiolite and palygorskite (attapulgite) which are found in veins within fissures and in fracture zones of the volcanic rocks of the region. This study was undertaken in order to understand these relationships better by characterizing sepiolite and palygorskite in this Formation and by examining their occurrence and distribution in the Tungho (TH) and Chunjih (CJ) areas. Samples were analyzed using X-ray diffraction (XRD), thermal analysis, Fourier-transform infrared (FTIR) spectroscopy, and petrographic, scanning (SEM), and transmission (TEM) electron microscopic methods. Sepiolite and palygorskite are blocky and earthy-type materials that display fibrous characteristics when viewed using TEM and SEM and occurred alone or with chalcedony in veins. The fibers of blocky sepiolite are commonly intercalated with smectite but the earthy type of sepiolite and palygorskite observed in this study displayed precipitation from fluid enriched in Si, Al, Mg, and minor Fe and depleted in other ions at an earlier stage of offset of the andesitic veins. Continuation of reverse faulting and high shearing stress caused the precipitation of a significant quantity of interlaminated sepiolite. Sepiolite and palygorskite were formed at an earlier stage of fluid interaction relative to smectite in the Tuluanshan Formation.

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Palygorskite in the Regolith from the Mokau District, North Island, New Zealand

Cited by 4 publications

References 22 publications

Nanostructure of palygorskite/sepiolite in Texas caliche: Possible bacterial origin

Nanostructure of palygorskite/sepiolite in Texas caliche: Possible bacterial origin

Erionite asbestiform fibres and health risk in Aotearoa/New Zealand: A research note

Origin and Mineralogy of Sepiolite and Palygorskite From the Tuluanshan Formation, Eastern Taiwan

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