Help|Log In|Register|
Home PageMindat NewsThe Mindat ManualHistory of MindatCopyright StatusManagement TeamContact UsAdvertise on Mindat
Donate to MindatSponsor a PageSponsored PagesTop Available PagesMindat AdvertisersAdvertise on MindatThe Mindat Store
Minerals by PropertiesMinerals by ChemistryRandom MineralSearch by minIDLocalities Near MeSearch GlossaryMore Search Options
Search For:
Mineral Name:
Locality Name:
The Mindat ManualAdd a New PhotoRate PhotosLocality Edit ReportAdd Glossary Item
StatisticsMember ListBooks & MagazinesMineral Shows & EventsThe Mindat DirectoryHow to Link to MindatDevice Settings
Photo SearchPhoto GalleriesNew Photos TodayNew Photos YesterdayMembers' Photo GalleriesPast Photo of the Day Gallery


This page is currently not sponsored. Click here to sponsor this page.
Jean-Baptiste-Julien d'Omalius d'Halloy(1783-1875)
Al2Si2O5(OH)4 · 2H2O
Named after the Belgian geologist Jean-Baptiste d'Omalius d'Halloy, (February 16th 1783 - January 15th 1875), who discovered the mineral. He was a nobleman, a statesman, and pioneer of modern geology in Belgium. The 10-Å(ngström) refers to the layer thickness.
Note: halloysite-10Å is not a polytype of halloysite.
It is an approved (grandfathered) species distinct from halloysite-7Å.

Synonyms are "endellite" (name for halloysite-10Å in European literature; discredited in 2006), "hydrated halloysite" and "hydrohalloysite."
Further localities are listed under "endellite".

Classification of Halloysite-10Å

Valid - first described prior to 1959 (pre-IMA) - "Grandfathered" URL:
Please feel free to link to this page.

Type Occurrence of Halloysite-10Å

Crystallography of Halloysite-10Å

Crystal System:
Class (H-M):
m - Domatic
Cell Parameters:
a = 5.1Å, b = 8.9Å, c = 10.25Å
β = 100.2°
a:b:c = 0.573 : 1 : 1.152
Unit Cell Volume:
V 457.89 ų (Calculated from Unit Cell)
Space group Cc.
X-Ray Powder Diffraction Data:
10 (10)
4.36 (7)
3.35 (4)
2.54 (3.5)
1.48 (3)
1.672 (1.4)
1.281 (0.8)

Chemical Properties of Halloysite-10Å

Al2Si2O5(OH)4 · 2H2O
Essential elements:
All elements listed in formula:

Other Names for Halloysite-10Å

Name in Other Languages:
Simplified Chinese:叙永石

Other Information

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Halloysite-10Å

Reference List:
Berthier (1826)

American Mineralogist 28 (1943), 1

Am. Mineral. 40 (1955) 1110

Powder Diffraction File (International Center for Diffraction Data) 29-1489

Clays and Clay Minerals 26 (1978), 25

Powder Diffraction 4 (1989), 19

Internet Links for Halloysite-10Å

Localities for Halloysite-10Å

map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
  • Río Negro
    • Ñorquincó department
CRAVERO, Fernanda; MARTINEZ, Gabriel Alexis and PESTALARD, Fernando. Halloysite deposits in Mamil Choique, provinceof Río Negro, Patagonia. Rev. Asoc. Geol. Argent. [online]. 2009, vol.65, n.3, pp. 586-592.
  • Styria
    • Bad Gleichenberg
      • Wilhelmsdorf
# Uwe Kolitsch (powder X-ray diffraction; Halloysite-10Å)
Belgium (TL)
  • Liège Province
    • Liège
Ann.Chim.Phys., sér. 2 (1826) 32, 332-335
  • Fujian Province
    • Xiamen Prefecture
      • Tong'an District
Mao Xingli and Yan Yipeng (1987): Journal of Fuzhou University, Natural Sciences Edition 15(3); Acta Petrologica et Mineralogica 11(2), 146-156 (1992)
  • Jiangsu Province
    • Suzhou Prefecture
      • Huqiu District
Kecong Han and Shengyun Ma (1985): Mineral Deposits 4(2), 58-68
  • Sichuan Province
    • Luzhou Prefecture
      • Xuyong Co.
Guoping Zhou (1990): Acta Mineralogica Sinica 10(1), 46-51
  • Southern Finland Region
    • Hämeenlinna
      • Kalvola
Lindquist, K. & Alviola, R. (1996): Fracture filling endellite from Iittala, Finland. in: 14th Conference on Clay Mineralogy and Petrology, September 2-6, 1996, Banská Štiavnica, Slovak Republik. Abstracts. Geologia Carpathica-Series Clays. 4 (4), 101-102
  • Hesse
    • Wetzlar
      • Weilburg
        • Essershausen
Blaß, G. & Möhn, G. (2010): Neue Mineralien von der Grube Mark bei Essershausen im Taunus. Mineralien-Welt 21 (2), 26-29.
  • Veszprém Co.
    • Balaton Uplands
      • Tapolcai Basin
        • Zalahaláp
  • Basilicata
    • Potenza Province
      • Melfi
        • Vulture Mount
Giorgio Bortolozzi collection (analysed by AMI UK Service)
  • Tuscany
    • Grosseto Province
      • Massa Marittima
Ciriotti, M.E., Blaß, G. (2010): Pot-pourri 2009: Identificazioni UKiS AMI, Minerali italiani di interesse. Micro, 1/2010, 124-127
  • Kyushu Region
    • Nansei Archipelago
      • Okinawa Prefecture
        • Tonaki Island
Alfredo Petrov specimens; PXRD by John Attard, 1-2013.
  • Urals Region
    • Southern Urals
      • Chelyabinsk Oblast'
        • Mezhozernyi
Igor Savin data
        • Ufaley District (Ufalei District)
Talovina, I.V., Lazarenkov, V.G., Ryzhkova, S.O., Ugol'kov, V.L., and Vorontsova, N.I. (2008): Lithology and Mineral Resources 43(6), 588-595.
Talovina, I.V., Lazarenkov, V.G., and Vorontsova, N.I. (2003): Lithology and Mineral Resources 38(5), 403-415.
      • Orenburgskaya Oblast'
        • Svetlyi
          • Buruktal District
            • Buruktal massif
Talovina, I.V., Lazarenkov, V.G., and Vorontsova, N.I. (2003): Lithology and Mineral Resources 38(5), 403-415.
  • California
    • Inyo Co.
      • Darwin Hills
        • Darwin District
          • Darwin
Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 436.
    • San Diego Co.
      • Pala District
        • Pala
Jahns, Richard Henry & Wright, Lauren A. (1951), Gem and lithium-bearing pegmatites of the Pala district, San Diego County, California. California Division of Mines Special Report 7-A: p. 31.
  • Georgia
    • DeKalb Co.
Grant,Williard H.( ) Weathering Of Stone Mountain Granite:Emory University,Atlanta,Georgia
  • Hawaii
    • Kauai Co.
Patterson,Sam H. and Murray,Haydn H. (1984) Kaolin,Refractory Clay,Ball Clay,and Halloysite in North America, Hawaii, and the Caribbean Region: USGS Professional Paper 1306
  • Indiana
    • Martin Co.
      • Shoals
Patterson,Sam H.,and Murray,Haydn H.(1984) Kaolin,Refractory Clay,Ball Clay, and Halloysite in North America,Hawaii and the Caribbean Region:U.S Department of the Interior,Geological Survey Professional Paper #1306
Sunderman, J & C. Beck (1959) Hydrobasaluminite from Shoals, Indiana: American Mineralogist: 54: 1363-1373.
  • Utah
    • Juab Co.
      • East Tintic Mts
        • Tintic District
          • Silver City
Patterson,Sam H. and Murray.Haydn H. (1984) Kaolin,Refractory Clay,Ball Clay,and Halloysite in North America,Hawaii and the Caribbean Region : USGS Professional Paper 1306
Mineral and/or Locality is an outreach project of the Hudson Institute of Mineralogy, a 501(c)(3) not-for-profit organization.
Copyright © and the Hudson Institute of Mineralogy 1993-2015, except where stated. relies on the contributions of thousands of members and supporters.
Privacy Policy - Terms & Conditions - Contact Us Current server date and time: October 7, 2015 13:33:08 Page generated: September 29, 2015 17:31:55