Erionite

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Erionite
Specific gravity
2.09 - 2.13 avg = 2.11
Optical propertiesUniaxial (-)
Refractive indexnω = 1.4711, nε = 1.474
Birefringenceδ = 0.0191
Other characteristicsnon-magnetic, non-radioactive, toxic if inhaled
References[2]

Erionite is a naturally occurring fibrous mineral that belongs to a group of minerals called

offretite, which is very similar to erionite in appearance and chemical composition.[5]

Properties

The chemical composition of erionite is approximately represented by the formula (Na
2,K
2,Ca)
2Al
4Si
14O
36•15H
2O. It can be differentiated into Erionite-Na, Erionite-K, and Erionite-Ca forms based on the most dominant component. Erionite has a hexagonal, cage-like structure composed of a framework of linked tetrahedra. It consists of white prismatic crystals in radiating groups of crystal fiber. Erionite absorbs up to 20% of its weight in water, has a specific gravity of 2.02 to 2.13, and has gas absorption, ion exchange, and catalytic properties that are highly selective and depend on the molecular size of the absorbed compounds.[6] Zeolites, in general, have good thermal stability, rehydration kinetics, and water vapor adsorption capacity.

Carcinogenicity

Erionite is known to be a human carcinogen and is listed by the

pleural and peritoneal mesothelioma due to erionite exposure in the Cappadocia region of Central Anatolia is very high.[8] Descriptive studies have reported an excess of mortality from mesothelioma in individuals living in three Turkish villages where there was chronic exposure to erionite; only two cases of mesothelioma occurred in the control village, both in women born elsewhere.[9][10] An excess of lung cancer also was reported in two of the three villages contaminated with erionite. Respirable erionite fibers were detected in air samples collected from the affected villages, and lung tissue samples collected from mesothelioma cases contained erionite fibers. A higher proportion of ferruginous bodies with a zeolite core were found in inhabitants of the contaminated villages than of those from the two control villages.[6][7][9] Erionite is reportedly present in the local volcanic tuff.[10]

There is sufficient evidence of carcinogenicity of erionite in

mice exposed by intraperitoneal injection had high incidences[spelling?] of mesotheliomas.[6][7] Additionally, although carcinogenic properties of erionite have been discovered by investigating the erionite found in Central Anatolia, Turkey, no difference in their carcinogenic capacity has been observed when it was compared to the erionite obtained in North Dakota, USA.[11]

Exposure

Deposits of fibrous erionite are located in Arizona, Nevada, Oregon, and Utah, as well in urban Auckland in New Zealand.[12] These zeolite beds may be up to 15 ft (4.6 m) thick and may lie in surface outcroppings. Erionite fibers have been detected in samples of road dust in Nevada and U.S. residents of the Intermountain West may be potentially exposed to fibrous erionite in ambient air.[6][13] In the summer of 2009 North Dakota began a study of possible erionite exposure among residents.[14] Erionite has also been identified in samples from the Tertiary Arikaree Formation in southeast Montana and northwest South Dakota.

In the past, occupational exposure occurred from erionite mining and production operation. Nowadays potential occupational exposure to erionite usually occurs during the production and mining of other zeolites. Erionite was also reported to be a minor component in some commercial zeolites.[15] Therefore, the use of other zeolites may result in potential exposure to erionite for the workers and the general population who use the zeolites in a variety of processes and products. Total dust exposures for miners in an open-pit zeolite mine that contained some erionite in Arizona ranged from 0.01 to 13.7 mg/m3; respirable dust in the mining area was 0.01 to 1.4 mg/m3.[6] Erionite is held responsible for the high incidence of

Cappadoccia.[16]

Gallery

  • Erionite-Ca
    Erionite-Ca
  • Erionite-K
    Erionite-K
  • Erionite and Offretite
    Erionite and Offretite
  • Erionite in Arizona
    Erionite in Arizona
  • Erionite in Veneto
    Erionite in Veneto

See also

References

  1. S2CID 235729616
    .
  2. ^ "General Erionite-Na Information". Mineralogy Database. Retrieved 13 July 2009.
  3. ^ "Erionite". North Dakota Department of Health. Archived from the original on 12 June 2010. Retrieved 13 July 2009.
  4. ^ "Erionite". National Cancer Institute. 20 March 2015. Retrieved 21 August 2018.
  5. ^ "The Mineral Erionite". Amethyst Galleries' Mineral Gallery. Retrieved 13 July 2009.
  6. ^
    PMID 2824337
    .
  7. ^
    PMID 3482203
    .
  8. S2CID 31259709
    .
  9. ^
    PMID 1848965
    .
  10. ^
    PMID 16537834
    .
  11. PMID 21788493
    .
  12. ^ Salmond, Jennifer; Brook, Martin (23 September 2020). "What lies beneath: is this the new asbestos?". Newsroom. Retrieved 5 March 2024.
  13. PMID 6299723
    .
  14. ^ "North Dakota Erionite Study Finally Underway". Mesothelioma SOS. 16 June 2009. Archived from the original on 14 July 2011. Retrieved 13 July 2009.
  15. ^ Mondale, K. D., F. A. Mumpton and F. F. Aplan. 1978. Beneficiation of Natural Zeolites from Bowie, Arizona: A Preliminary Report. In Natural Zeolites: Occurrences, Properties, Uses. L. B. Sand and F. A. Mumpton, eds. New York: Pergamon Press. p. 527-537.
  16. ^ ERİSA DAUTAJ ŞENERDEM (6 October 2010). "Burial planned for Turkish 'cancer city'". Hürriyet Daily News. Retrieved 20 June 2012.

Public Domain This article incorporates

United States Government
.

External links

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