Crocidolite
A variety of Riebeckite Root Name Group
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About Crocidolite
Formula:
◻[Na2][Z2+3Fe3+2]Si8O22(OH,F,Cl)2
Name:
Named by Hausmann for the Greek κροχυς, flake [Flocke in German] or actually the wool that comes off from the wrap of the cloth.
Unique Identifiers
Mindat ID:
8996 (as Crocidolite)
8698 (as Riebeckite Root Name Group)
8698 (as Riebeckite Root Name Group)
Long-form identifier:
mindat:1:1:8996:4 (as Crocidolite)
mindat:1:1:8698:7 (as Riebeckite Root Name Group)
mindat:1:1:8698:7 (as Riebeckite Root Name Group)
Chemistry of Crocidolite
Mindat Formula:
◻[Na2][Z2+3Fe3+2]Si8O22(OH,F,Cl)2
Element Weights:
Synonyms of Crocidolite
Other Language Names for Crocidolite
Varieties of Crocidolite
| Cape Asbestos | A variety of crocidolite occurring in narrow interbedded veins traversing the Griqua Town series of banded jaspers and ironstones in Griqualand, South Africa. |
Common Associates
Associations Based on Photo Data:
| 6 photos of Crocidolite associated with Magnesio-riebeckite | ◻Na2(Mg3Fe3+2)(Si8O22)(OH)2 |
| 6 photos of Crocidolite associated with 'Amethyst' | SiO2 |
| 5 photos of Crocidolite associated with Hematite | Fe2O3 |
| 4 photos of Crocidolite associated with Quartz | SiO2 |
| 3 photos of Crocidolite associated with Pyrite | FeS2 |
| 3 photos of Crocidolite associated with 'Tiger's Eye' | |
| 3 photos of Crocidolite associated with Riebeckite | ◻Na2(Fe2+3Fe3+2)Si8O22(OH)2 |
| 3 photos of Crocidolite associated with Microcline | K(AlSi3O8) |
| 2 photos of Crocidolite associated with Anatase | TiO2 |
| 2 photos of Crocidolite associated with Lepidocrocite | Fe3+O(OH) |
Other Information
Health Risks:
This mineral is known to be a respirable carcinogen, and is a common form of asbestos. Exposure to very dusty air or long-term exposure to low level airborne dusts containing fine fibres of the mineral has been found to cause a high risk of serious lung disease including mesothelioma and lung cancer. Care should be taken working with samples that contain fibrous forms of this mineral, to avoid creating or inhaling dusts. Non-fibrous forms, such as in many amphibolites, are safer to handle, but can still produce potentially carcinogenic respirable fibre when crushed. Appropriate dust masks should be worn if working in areas which have dusts likely to be rich in this mineral. Storage and careful handling of specimens has little or no risk.
Internet Links for Crocidolite
mindat.org URL:
https://www.mindat.org/min-8996.html
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References for Crocidolite
Reference List:
(1831) Beschreibung und Zerlegung des asbestartigen Krokydoliths. Annalen der Physik und Chemie, 99. 153-158 doi:10.1002/andp.18310990912
Whittaker, E. J. W. (1949) The structure of Bolivian crocidolite. Acta Crystallographica, 2 (5) 312-317 doi:10.1107/s0365110x49000801(= magnesio-riebeckite)
Addison, W. E., White, A. D. (1968) The oxidation of Bolivian crocidolite. Mineralogical Magazine and Journal of the Mineralogical Society, 36 (282) 791-796 doi:10.1180/minmag.1968.036.282.05
Burns, Roger G., Prentice, F. J. (1968) Distribution of iron cations in the crocidolite structure. American Mineralogist, 53 (5-6) 770-776
Localities for Crocidolite
Showing 88 localities.
symbol to view information about a locality.
The Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and further information on this occurrence.
? - Indicates mineral may be doubtful at this locality.
- Good crystals or important locality for species.
- World class for species or very significant.
(TL) - Type Locality for a valid mineral species.
(FRL) - First Recorded Locality for everything else (eg varieties).
All localities listed without proper references should be considered as questionable.
Australia | |
| Stracke +5 other references |
| Drexel (2009) |
| Noble et al. (1983) |
| |
| Miyano et al. (1983) |
| Ayres (1972) +1 other reference |
| www.mininglegacies.org (2015) |
| Grubb (1971) | |
| www.mininglegacies.org (2015) | |
| BHP |
| BHP |
Austria | |
| Niedermayr (1991) +1 other reference |
| - (n.d.) |
| Strasser (1995) |
| Hasenberger et al. (1998) | |
| Medwenitsch (1967) +1 other reference |
| Zirkl (1950) |
| Polz (1989) |
| Meixner (1978) | |
| Polz (1989) | |
Bolivia | |
| Federico Ahlfeld (1967) |
| Harvard Mineralogical Museum no. 112670 |
Cambodia | |
| Montgomery (n.d.) | |
Canada | |
| Novagold Resources Inc. |
| Sabina (1971) |
| Erik Vercammen collection |
China | |
| Shixin Yao et al. (1993) |
DR Congo | |
| Mambwe et al. (Ruashi Cu-Co Deposit) |
| Gécamines (1977) |
France | |
| Belot (1978) |
Germany | |
| F. Müller: "Bayerns steinreiche Ecke" et al. (Hof) |
| F. Müller: "Bayerns steinreiche Ecke" et al. (Hof) |
Greenland | |
| Bøggild (1953) +1 other reference |
| Petersen (2001) | |
| Photo id.725349 |
India | |
| Ramasamy et al. (2013) |
Norway | |
| Weibye (1848) |
| Knut Edvard Larsen observation in field ... |
| Nordrum (2005) |
| Berge et al. (2002) |
| Knut Edvard Larsen observation in field ... |
South Africa | |
| Miyano et al. (1997) |
| Schapira et al. (2023) |
| upetd.up.ac.za (n.d.) |
| Cairncross et al. (1995) | |
| M. Arliguie and Van King specimens. +1 other reference |
Spain | |
| Alejandro Sánchez Jiménez |
| Alejandro Sánchez Jiménez | |
UK | |
| DEANS et al. (1971) |
| DEANS et al. (1971) +1 other reference | |
Ukraine | |
| Cuney et al. (2012) |
USA | |
| Anthony et al. (1995) |
| Anthony et al. (1995) |
| Anonymous (1950) +3 other references |
| Butler (1995) |
| Murdoch (1966) |
| Pelletier | |
| USGS Open File report 2010-5220 |
| Tucker et al. (1943) +3 other references |
| Rogers (1912) +1 other reference |
| Murdoch (1966) |
| USGS Prof Paper 649 |
| Armbrustmacher (1988) | |
| USGS Prof Paper 649 | |
| Eckel et al. (1997) | |
| Tank (1972) | |
| P Cristofono collection |
| P Cristofono collection | |
| |
| Rocks & Min.: 19:244 +1 other reference | |
| Cristofono (n.d.) | |
| Rocks & Min.: 16:255. | |
| |
| Meyers et al. (1956) +1 other reference |
| Manchester (1931) |
| Ransom (1974) | |
| Maertens (2007) |
| Kunz (1890) |
| Jensen (1978) |
| Gordon (1922) |
| Gordon (1922) | |
| Benge and Wherry |
| Miller (1971) |
| Pabst (1973) |
| Bullock (1981) | |
| Dietrich (1990) |
| Cordua (1998) |
Northern Cape, South Africa