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Halloysite-7Å

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Jean-Baptiste-Julien d'Omalius d'Halloy(1783-1875)
Formula:
Al2(Si2O5)(OH)4
Crystal System:
Monoclinic
Name:
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 7-Å(ngström) refers to the layer thickness.
Note: halloysite-7Å is NOT a polytype of halloysite.
It is an approved (grandfathered) species distinct from Halloysite-10Å which contains two water molecules per formula unit.

A synonym is "metahalloysite."

See also the chemically identical kaolinite.





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Classification of Halloysite-7ÅHide

Approved, 'Grandfathered' (first described prior to 1959)
9.ED.10

9 : SILICATES (Germanates)
E : Phyllosilicates
D : Phyllosilicates with kaolinite layers composed of tetrahedral and octahedral nets

Chemical Properties of Halloysite-7ÅHide

Formula:
Al2(Si2O5)(OH)4
IMA Formula:
Al2Si2O5(OH)4

Crystallography of Halloysite-7ÅHide

Crystal System:
Monoclinic
Class (H-M):
m - Domatic
Space Group:
Bb
Setting:
Cc
Cell Parameters:
a = 5.14(4) Å, b = 8.90(4) Å, c = 14.9(1) Å
β = 101.9°
Ratio:
a:b:c = 0.578 : 1 : 1.674
Unit Cell V:
666.97 ų (Calculated from Unit Cell)
Z:
4
Comment:
Space group Cc.

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
4.45 (77)
4.41 (83)
4.07 (48)
3.73 (81)
3.57 (45)
3.08 (29)
2.86 (32)
2.56 (15)
2.54 (39)
2.49 (58)
2.36 (100)
2.29 (33)
2.03 (28)
1.95 (25)
1.71 (37)
1.64 (16)
1.57 (45)
1.48 (40)
1.47 (12)
(
(
(

Type Occurrence of Halloysite-7ÅHide

Synonyms of Halloysite-7ÅHide

Other Language Names for Halloysite-7ÅHide

Simplified Chinese:变叙永石

Related Minerals - Nickel-Strunz GroupingHide

9.ED.ClinochrysotileMon. 2/m
9.ED.05DickiteAl2(Si2O5)(OH)4Mon. m : Bb
9.ED.05KaoliniteAl2(Si2O5)(OH)4Tric. 1 : P1
9.ED.05NacriteAl2(Si2O5)(OH)4Mon. m : Bb
9.ED.05Odinite(Fe,Mg,Al,Fe,Ti,Mn)2.4((Si,Al)2O5)(OH)4Mon. m : Bm
9.ED.10HalloysiteAl2(Si2O5)(OH)4Mon. m : Bb
9.ED.10HisingeriteFe3+2(Si2O5)(OH)4 · 2H2OMon.
9.ED.15AmesiteMg2Al(AlSiO5)(OH)4Tric. 1 : P1
9.ED.15AntigoriteMg3(Si2O5)(OH)4Mon. m : Bm
9.ED.15Berthierine(Fe2+,Fe3+,Al)3(Si,Al)2O5(OH)4Mon. m : Bm
9.ED.15Brindleyite(Ni,Al)3(Si,Al)2O5(OH)4Mon.
9.ED.15CaryopiliteMn2+3Si2O5(OH)4Mon.
9.ED.15ChrysotileMg3(Si2O5)(OH)4Mon.
9.ED.15CronstedtiteFe2+2Fe3+((Si,Fe3+)2O5)(OH)4Trig. 3m : P3 1m
9.ED.15Fraipontite(Zn,Al)3((Si,Al)2O5)(OH)4Mon.
9.ED.15Greenalite(Fe2+,Fe3+)2-3Si2O5(OH)4Mon.
9.ED.15KellyiteMn2+2Al(AlSiO5)(OH)4Hex.
9.ED.15LizarditeMg3(Si2O5)(OH)4
9.ED.15ManandoniteLi2Al4(Si2AlB)O10(OH)8Orth.
9.ED.15Népouite(Ni,Mg)3(Si2O5)(OH)4Orth.
9.ED.15PecoraiteNi3(Si2O5)(OH)4Mon.
9.ED.15GuidottiiteMn2Fe3+(Fe3+SiO5)(OH)4Hex. 6 : P63
9.ED.20Allophane(Al2O3)(SiO2)1.3-2 · 2.5-3H2OAmor.
9.ED.20ChrysocollaCu2-xAlx(H2-xSi2O5)(OH)4 · nH2OOrth.
9.ED.20ImogoliteAl2SiO3(OH)4
9.ED.20Neotocite(Mn,Fe,Mg)SiO3 · H2OAmor.
9.ED.25BismutoferriteFe3+2Bi(SiO4)2(OH)Mon. m : Bm
9.ED.25ChapmaniteFe3+2Sb3+(Si2O5)O3(OH)Mon. m : Bm

Other InformationHide

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-7ÅHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Berthier (1826)
American Mineralogist 39 (1954), 97
American Mineralogist 40 (1955), 1110
Acta Crystallographica B31 (1975), 2851
Clays and Clay Minerals 26 (1978), 25
Powder Diffraction 4 (1989), 19
Clays and Clay Minerals (1991): 39: 113.
Handbook of Mineralogy (Anthony et al.), 2 (1995), 311
Joussein, E., Petit, S., Churchman, J., Theng, B., Righi, D., and Delvaux, B. (2005): Halloysite clay minerals — A review. Clay Minerals, 40, 383–426.

Internet Links for Halloysite-7ÅHide

Localities for Halloysite-7ÅHide

This 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.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for 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). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Austria
 
  • Lower Austria
    • Waldviertel
      • Mühldorf
        • Amstall
GOLDMANN, Christoph & LÖFFLER, Erwin (2008): Die Mineralienfundstellen des Graphitbergbaues Amstall, NÖ.- Mefos, 19/35, 4-34, A-D, Wien.
R. Exel: Die Mineralien und Erzlagerstätten Österreichs (1993)
Belgium (TL)
 
  • Liège Province
    • Liège
Ann.Chim.Phys., sér. 2 (1826) 32, 332-335
China
 
  • 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)
  • Guangxi Zhuang Autonomous Region
    • Baise Prefecture
      • Pingguo Co.
Zhongcao Liang (1983): Geology and Prospecting 19(8), 24-28; Xinyu Cao and Tongjiang Tang (1986): Geology and Prospecting 22(2), 18-23
  • Hunan Province
    • Huaihua Prefecture
      • Chenxi Co.
Shu-Gen Zhang, Xiao-Hu Liu, and Jun Ding (2006): Acta Petrologica et Mineralogica [Yanshikuangwuxue Zazhi] 25(5), 433-439.
  • Jiangsu Province
    • Suzhou Prefecture
      • Huqiu District
Kecong Han and Shengyun Ma (1985): Mineral Deposits 4(2), 58-68
Czech Republic
 
  • Moravia (Mähren; Maehren)
    • Vysočina Region
      • Třebíč District
        • Moravské Budějovice
Natural History Museum London 2015
Denmark
 
  • Faroe Islands
    • Suðuroy Island
      • Hvalba
Weisenberger, T. B. & Spürgin, S. (2012): Die Färöer - ein geologischer Streifzug. Aufschluss 63, 173-192.
France
 
  • Auvergne-Rhône-Alpes
    • Haute-Loire
      • Paulhaguet
        • Salzuit
      • Saint-Julien-Chapteuil
        • Le Pertuis
Bull. Soc. Franç. Minéralo. Cristallo. , 1974, 97, p. 494.
Germany
 
  • Baden-Württemberg
    • Black Forest
      • Wolfach
        • Oberwolfach
          • Rankach valley
Walenta, K. (1992): Die Mineralien des Schwarzwaldes. Chr. Weise Verlag, München, 336 pp. (in German)
  • Rhineland-Palatinate
    • Eifel
      • Laach lake volcanic complex
        • Mendig
          • Niedermendig
Blass, G.; Graf, H.W., Neue Mineralienfunde aus der Eifel und dem Siegerland, Mineralien-Welt 10/3, 23, 1999
Blass, G.; Graf, H.W., Neue Mineralienfunde aus der Eifel und dem Siegerland, Mineralien-Welt 10/3, 23, 1999
    • Siegerland
      • Gebhardshain
        • Kausen
Wittern: "Mineralfundstellen in Deutschland", 2001
Greece
 
  • Attikí Prefecture (Attica; Attika)
    • Lavrion District (Laurion; Laurium)
      • Lavrion District Mines
        • Agios Konstantinos [St Constantine] (Kamariza)
Möckel, S. (2000): Strashimirit und 11 weitere Neubestimmungen aus Lavrion (GR). Lapis 25 (7-8), 74.
        • Sounion area
          • Agia Varvara Mines (St Barbara Mines)
Möckel, S. (2000): Strashimirit und 11 weitere Neubestimmungen aus Lavrion (GR). Lapis 25 (7-8), 74.
Indonesia
 
  • Java (Jawa)
    • Jawa Barat Province (West Java Province)
      • Bogor District
Milési, J.P., Marcoux, E., Sitorus, T., Simandjuntak, M., Leroy, J., and Bailly, L. (1999): Mineralium Deposita 34, 131-149.
Italy
 
  • Latium
    • Rome Province
Lombardi, G., Mattias, P. (1979): Petrology and mineralogy of the kaolin and alunite mineralizations of Latium (Italy). Geol. Romana, 18, 157-214; Lombardi, G. (1984): Thermal analysis in the investigation of zeolitized and altered volcanics of Latium, Italy. Clay Minerals, 19, 789-801.
  • Liguria
    • Genova Province
      • Genova
Ciriotti, M.E., Blaß, G. (2010): Pot-pourri 2009: Identificazioni UKiS AMI, Minerali italiani di interesse. Micro, 1/2010, 124-127
  • Sardinia
    • Cagliari Province
      • Sarroch
- Orlandi, P., Gelosa, M., Bonacina, E., Caboni, F., Mamberti, M., Tanca, G., A. et Vinci, A. (2013) : Sardignaite, gelosaite et tancaite-(Ce) : trois nouveaux minéraux de Su Seinargiu, Sarroch, Sardaigne, Italie. Le Règne Minéral, 112, 39-52.; Orlandi P., Gelosa M., Bonacina E., Caboni F., Mamberti M., Tanca G.A., Vinci A. (2015): Sette nuove specie mineralogiche della Sardegna. I minerali della mineralizzazione a molibdeno e bismuto di Su Seinargiu (CA). Riv. Mineral. Ital., 39, 2, 84-115.
New Zealand
 
  • Kermadec Islands
Muiruru F.G. (1985) Hot spring and rock samples from Curtis Island Volcano, Kermadec Group. Unpub. paper Geothermal Institute, University of Auckland
Peru
 
  • Cajamarca Department
    • Cajamarca Province
      • Cajamarca
Dill, H.G., Bosse, H.-R., Henning, K.-H., Fricke, A., and Ahrendt, H. (1997): Mineralium Deposita 32, 149-163.
Romania
 
  • Satu Mare Co.
    • Satu Mare
      • Oaș Mts
        • Negrești-Oaș
          • Turț
Clain, E. & Haake, R. (2006): Die Blei-Zink-Lagerstätte von Turt, Oasgebirge, Rumänien. Mineralien-Welt 17 (5), 52-64. (in German)
Russia
 
  • Far-Eastern Region
Volokhin, Yu.G., Karabtsov, A.A. (2016): Minerals in the Triassic Carbonaceous Silicites of Sikhote Alin. Lithology and Mineral Resources: 51: 405-424
  • Urals Region
    • Southern Urals
      • Orenburgskaya Oblast'
        • Dombarov District
Gorbachev, B.F., Sharapov, A.F., Lyadskii, P.V., and Shmel'kov, N.T. (2004): The South Ushkoty Eluvial Kaolin Deposit in the Southeastern Orenburg Region. Lithology and Mineral Resources 39(5), 412-424.
        • Svetlyi
          • Buruktal District
            • Buruktal massif
Talovina, I.V., Lazarenkov, V.G., and Vorontsova, N.I. (2003): Lithology and Mineral Resources 38(5), 403-415.
Slovakia
 
  • Košice Region
    • Michalovce Co.
      • Michalovce (Großmichel)
Koděra et all.,1990: Topografická mineralógia Slovenska, I-III, 1590p
  • Nitra Region
    • Levice Co.
Koděra, M. et al., 1986 a 1990 : Topografická mineralógia Slovenska, diel 1- 3, Veda – Vydavateľstvo SAV, Bratislava, 1990, 1 – 1590
  • Prešov Region
    • Prešov Co.
      • Červenica
        • Dubník
Koděra, M. et al., 1986 a 1990 : Topografická mineralógia Slovenska, diel 1- 3, Veda – Vydavateľstvo SAV, Bratislava, 1990, 1 – 1590
Duda et. all.,1981:Minerály severnej časti Slanských vrchov. Min.Slovca,Monografia 2,Bratislava, 98 p
    • Vranov nad Topľou Co.
Koděra, M. et al., 1986 a 1990 : Topografická mineralógia Slovenska, diel 1- 3, Veda – Vydavateľstvo SAV, Bratislava, 1990, 1 – 1590k
UK
 
  • Scotland
    • Buchan Grampian
Livingstone, A. and Macpherson, H.G. (1983) Fifth supplementary list of British minerals (Scottish). Mineralogical Magazine, vol. 47, n° 342, p. 99-105.
USA
 
  • Alabama
    • De Kalb Co.
Thomas F.Bates,Fred A.Hilderband and Ada Swineford (1950) Morphology and Structure of Endellite and Halloysite.The American Mineralogist Vol.35,July-August 1950,No.7-8
  • Maine
    • Oxford Co.
      • Paris
King, V. T. and Foord, E. E., 1994, Mineralogy of Maine, Descriptive Mineralogy, volume 1, Maine Geological Survey, Augusta, Maine, USA, pp. 418 + 88 plates.
  • North Carolina
    • Catawba Co.
Bates,Thomas F.,Hiderbrand,Fred A.,and Swineford,Ada.,(1950) Morphology and Structure of Endellite and Halloysite: The American Mineralogist,Vol.35,July-August,1950,No.7-8
Bates,Thomas F.,Hiderbrand,Fred A.,and Swineford,Ada.,(1950) Morphology and Structure of Endellite and Halloysite :The American Mineralogist ,Vol.35.July-August,1950,No.7-8
Sand,L.B.,(1954) On The Genesis of Residual Kaolins
Sand,L.B.,(1954) On The Genesis of Residual Kaolins
    • Jackson Co.
Bates,Thomas F.,Hiderbrand,Fred A.,and Swineford,Ada (1950) Morphology and Structure of Endellite and Halloysite : The American Mineralogist,Vol.35,July-Aug,1950,No.7-8
Sand,L.B.,(1954) On The Genesis of Residual Kaolins
      • Cowee Valley
        • Ellijay District
          • Franklin
Clays and Clay Minerals,39 and 113, 1991
    • Mitchell Co.
      • Spruce Pine District
        • Spruce Pine
Johnson,Sheryl L.,Guggenheim,Stephen and Van Groos,A.F Koster (1990)Thermal Stability of Halloysite by High-Pressure Differential Thermal Analysis :Clay and Clay Minerals,Vol.38,No.5,pg.477-484,1990
Sand,L.B.,(1954) On The Genesis of Residual Kaolins
    • Yancey Co.
      • Spruce Pine District
        • Celo
Sand,L.B.,(1954) On The Genesis of Residual Kaolins
  • Texas
    • Real Co.
Thomas F.Bates,Fred A.Hilderband and Ada Swineford (1950) Morphology and Structure of Endellite and Halloysite. The American Mineralogist Vol.35: July-August 1950,No.7-8
  • 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
  • Virginia
    • Albemarle Co.
      • Charlottesville
Minerals of Virginia, 1990 by R. V. Dietrich
    • Amherst Co.
      • Roseland
Minerals of Virginia, 1990 by R. V. Dietrich
    • Campbell Co.
      • Alta Vista
Minerals of Virginia, 1990 by R. V. Dietrich
    • Nelson Co.
Minerals of Virginia, 1990 by R. V. Dietrich
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