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About Clinoptilolite-KHide

Generally not pure but containing additional Na and/or Ca. Formula previously given as (K,Na,Ca)2-3Al3(Al,Si)2Si13O36.12H2O.
3½ - 4
Crystal System:
From the Greek klino - "oblique" ptylon - "feather" and lithos - "stone." Named as the monoclinic dimorph of "ptilolite" (mordenite).

Classification of Clinoptilolite-KHide

Approved, 'Grandfathered' (first described prior to 1959)
First Published:

9 : SILICATES (Germanates)
G : Tektosilicates with zeolitic H2O; zeolite family
E : Chains of T10O20 Tetrahedra

Physical Properties of Clinoptilolite-KHide

3½ - 4 on Mohs scale

Optical Data of Clinoptilolite-KHide

Biaxial (+/-)
RI values:
nα = 1.476 - 1.491 nβ = 1.479 - 1.493 nγ = 1.479 - 1.497
Measured: 31° to 48°
Max Birefringence:
δ = 0.003 - 0.006
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
r > v to r < v strong

Chemical Properties of Clinoptilolite-KHide


Generally not pure but containing additional Na and/or Ca. Formula previously given as (K,Na,Ca)2-3Al3(Al,Si)2Si13O36.12H2O.
IMA Formula:
K6(Si30Al6)O72 · 20H2O

Crystallography of Clinoptilolite-KHide

Crystal System:
Class (H-M):
2/m - Prismatic
Cell Parameters:
a = 17.688 Å, b = 17.902 Å, c = 7.409 Å
β = 116.5°
a:b:c = 0.988 : 1 : 0.414
Unit Cell V:
2,099.57 ų (Calculated from Unit Cell)

Type Occurrence of Clinoptilolite-KHide

Ogihara, S. and Iijima, A. (1990) Exceptionally K-rich clinoptilolite – heulandite group zeolites from three offshore boreholes off northern Japan. European Journal of Mineralogy: 2: 819-826.

Other Language Names for Clinoptilolite-KHide

Relationship of Clinoptilolite-K to other SpeciesHide

Other Members of this group:
Clinoptilolite-NaNa6(Si30Al6)O72·20H2OMon. 2/m : B2/m
Forms a series with:

Common AssociatesHide

Associated Minerals Based on Photo Data:
Eudialyte Group6 photos of Clinoptilolite-K associated with Eudialyte Group on mindat.org.
Chabazite-Ca5 photos of Clinoptilolite-K associated with Chabazite-Ca on mindat.org.
Lovozerite Group4 photos of Clinoptilolite-K associated with Lovozerite Group on mindat.org.
Ferrierite-Mg4 photos of Clinoptilolite-K associated with Ferrierite-Mg on mindat.org.
Microcline3 photos of Clinoptilolite-K associated with Microcline on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

9.GE.05Clinoptilolite-NaNa6(Si30Al6)O72·20H2OMon. 2/m : B2/m
9.GE.05Heulandite-Ca(Ca,Na)5(Si27Al9)O72 · 26H2OMon. 2/m : B2/m
9.GE.05Heulandite-K(K,Ca,Na)5(Si27Al9)O72 · 26H2OMon. 2/m : B2/m
9.GE.05Heulandite-Na(Na,Ca,K)6(Si,Al)36O72 · 22H2OMon. 2/m : B2/m
9.GE.05Heulandite-Sr(Sr,Na,Ca)5(Si27Al9)O72 · 24H2OMon. 2/m : B2/m
9.GE.05Heulandite-Ba(Ba,Ca,K)5(Si27Al9)O72 · 22H2OMon. 2/m : B2/m
9.GE.10Stilbite-CaNaCa4[Al9Si27O72] · nH2OMon. 2/m : B2/m
9.GE.10Stilbite-Na(Na,Ca,K)6-7[Al8Si28O72] · nH2OMon. 2/m : B2/m
9.GE.15Barrerite(Na,K,Ca0.5)2[Al2Si7O18] · 7H2OOrth. mmm (2/m 2/m 2/m)
9.GE.15StelleriteCa4(Si28Al8)O72 · 28H2OOrth. mmm (2/m 2/m 2/m) : Fmmm
9.GE.20Brewsterite-Ba(Ba,Sr)[Al2Si6O16] · 5H2OMon. 2/m : P21/m
9.GE.20Brewsterite-Sr(Sr,Ba,Ca)[Al2Si6O16] · 5H2O

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 Clinoptilolite-KHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Koyama, K. & Y. Takeuchi (1977) Clinoptilolite: The distribution of potassium atoms and its role in thermal stability. Zeitschrift für Kristallographie: 145: 216-239.
Alberti, A. (1972) On the crystal structure of the zeolite heulandite. Tschermaks Mineralogische und Petrographische Mitteilungen: 18: 129-146.
Ogihara, S. and Iijima, A. (1990) Exceptionally K-rich clinoptilolite – heulandite group zeolites from three offshore boreholes off northern Japan. European Journal of Mineralogy: 2: 819-826.
Armbruster, T. (1993) Dehydration mechanism of clinoptilolite and heulandite: Single-crystal X-ray study of Na-poor, Ca-, K-, Mg-rich clinoptilolite at 100K. American Mineralogist: 78: 260-264.
Coombs, D., A. Alberti, T. Armbruster, G. Artioli, C. Colella, E. Galli, J. Grice, F. Liebau, J. Mandarino, H. Minato, E. Nickel, E. Passaglia, D. Peacor, S. Quartieri, R. Rinaldi, M. Ross, R. Sheppard, E. Tillmanns, G. Vezzalini (1997) Recommended Nomenclature for Zelite Minerals: Report of the Subcommittee on Zeolites of the International Mineralogical Association, Commission on New Minerals and Mineral Names. The Canadian Mineralogist: 35: 1571-1606.
Esenli, Fahri and Isik Kumbasar (1998) X-Ray Diffraction Intensity Ratios I(111)//(311) of Natural Heulandites and Clinoptilolites. Clays and Clay Minerals: 46(6): 679-686.
Johnson, M., O'Connor, D., Barnes, P., Catlow, C. R. A., Owens, S. L., Sankar, G., Bell, R., Teat, S. J. and Stephenson, R. (2003) Cation exchange, dehydration, and calcination in clinoptilolite: in situ X-ray diffraction and computer modeling. Journal of Physical Chemistry B: 107: 942-951.
Snellings, R.A., Gualtieri, A.F., Elsen, J. (2009) The Rietveld structure refinement of an exceptionally pure sample of clinoptilolite from Ecuador and its Na-, K-, and Ca-exchanged forms. Zeitschrift für Kristallographie Supplements: 30: 395-400.

Internet Links for Clinoptilolite-KHide

Localities for Clinoptilolite-KHide

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.
  • Kardzhali Oblast (Kurdzhali; Kărdžali; Kurdjali)
    • Momchilgrad Obshtina
Encheva, S., Petrov, P., Chukanov, N., Pekov, I., Енчева, С., Петко, П., ... & Пеков, И. Dachiardite-K from the area of Austa village, Momchilgrad municipality, Eastern Rhodopes–a new mineral species of zeolite group Дакиардит-K от района на с. Ауста, община Момчилград, Източни Родопи–нов минерален вид от групата на зеолитите.
  • Québec
    • Montérégie
      • La Vallée-du-Richelieu RCM
        • Mont Saint-Hilaire
Tillet collection
  • Antofagasta
    • Antofagasta Province
      • Mejillones
        • Mejillones peninsula
http://www.handbookofmineralogy.com/pdfs/mejillonesite.pdf; Atencio, D., Chukanov, N. V., Nestola, F., Witzke, T., Coutinho, J. M., Zadov, A. E., ... & Färber, G. (2012). Mejillonesite, a new acid sodium, magnesium phosphate mineral, from Mejillones, Antofagasta, Chile. American Mineralogist, 97(1), 19-25.
  • Heilongjiang
    • Mudanjiang
      • Muling Co.
Shouting Zhang, Pengda Zhao, Zhanzhang Xu, and Gengdong Yang (2004): Mineral Deposits 23(1), 31-38
Czech Republic
  • Moravian-Silesian Region
    • Nový Jičín
      • Skotnice
Peter Fuchs
  • Borsod-Abaúj-Zemplén
    • Zemplén Mts (Tokaj Mts)
      • Rátka
WDS - Norbert Zajzon
  • Yamagata
    • Yonezawa City
Minato & Takano (1964) Nendo Kagaku, 4, 12-22.
  • Veracruz
    • Mun. de Tatatila
James McGasson, 2018 on Peter Megaw specimens
  • Kamchatka Krai
Pavel M. Kartashov analytical data (1984)
  • Andalusia
    • Almería
      • Níjar
Calvo, M. (2018). Minerales y Minas de España. Vol. IX. Silicatos. Escuela Técnica Superior de Ingenieros de Minas de Madrid. Fundación Gómez Pardo. 767 págs.
  • California
    • Los Angeles Co.
      • Santa Monica Mts
RRUFF database specimen no.R110201
  • Idaho
Altaner,Stephan P. and Grim,Ralph E.(1990) Mineralogy,Chemistry,And Diagenesis Of Tuffs In The Sucker Creek Formation (Miocene) Eastern Oregon; Clays and Clay Minerals,Vol.38,No.6,pp.561-572,pg 563, Section E.
  • Oregon
Altaner,Stephan P.and Grim,Ralph E.(1990) Mineralogy ,Chemistry,And Diagenesis Of Tuffs In The Sucker Creek Formation(Miocene),Eastern Oregon:Clays and Clay Minerals ,Vol.38,No.6,pp.561-572
  • Wyoming
    • Park Co.
Am Min (1938) 17:128-134; Am. J. Sci. (1890) 40:232; PIRSSON, L.V. (1890): On mordenite. Am. J. Sci. 140, 232-237.
Mineral and/or Locality  
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