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Ca3(Si30Al6)O72 · 20H2O
3½ - 4
From the Greek klino - "oblique" ptylon - "feather" and lithos - "stone." The Ca-dominant member of the clinoptilolite series.

Classification of Clinoptilolite-Ca


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

Physical Properties of Clinoptilolite-Ca

Hardness (Mohs):
3½ - 4

Optical Data of Clinoptilolite-Ca

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-Ca

IMA Formula:
Ca3(Si30Al6)O72 · 20H2O Formula:

Generally not pure but containing additional Na and/or K. Formula previously given as (Ca,Na,K)2-3Al3(Al,Si)2Si13O36.12H2O.
Elements listed in formula:

Crystallography of Clinoptilolite-Ca

Crystal System:
Cell Parameters:
a = 17.66 Å, b = 17.963 Å, c = 7.4 Å
β = 116.47°
a:b:c = 0.983 : 1 : 0.412
Unit Cell Volume:
V 2,101.39 ų (Calculated from Unit Cell)

Type Occurrence of Clinoptilolite-Ca

Relationship of Clinoptilolite-Ca to other Species

Forms a series with Heulandite-Ca (see here)
Other Members of Group:
9.GE.05Clinoptilolite-KK6(Si30Al6)O72 · 20H2O
9.GE.05Clinoptilolite-NaNa6(Si30Al6)O72 · 20H2O
9.GE.05Heulandite-Ca(Ca,Na,K)5(Si27Al9)O72 · 26H2O
9.GE.05Heulandite-K(K,Ca,Na)5(Si27Al9)O72 · 26H2O
9.GE.05Heulandite-Na(Na,Ca,K)6(Si,Al)36O72 · 22H2O
9.GE.05Heulandite-Sr(Sr,Ca,Na)5(Si27Al9)O72 · 24H2O
9.GE.05Heulandite-Ba(Ba,Ca,K)5(Si27Al9)O72 · 22H2O
9.GE.10Stilbite-CaNaCa4(Si27Al9)O72 · 28H2O
9.GE.10Stilbite-NaNa9(Si27Al9)O72 · 28H2O
9.GE.15BarreriteNa2(Al2Si7)O18 · 6H2O
9.GE.15StelleriteCa4(Si28Al8)O72 · 28H2O
9.GE.20Brewsterite-BaBa(Al2Si6)O16 · 5H2O
9.GE.20Brewsterite-SrSr(Al2Si6)O16 · 5H2O

Other Names for Clinoptilolite-Ca

Name in Other Languages:

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 Clinoptilolite-Ca

Reference List:
Tschermaks Mineralogische und Petrographische Mitteilungen: 18: 129-146.

Zeitschrift für Kristallographie: 145: 216-239.

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.

Fahri Esenli and Isik Kumbasar (1998) X-Ray Diffraction Intensity Ratios I(111)//(311) of Natural Heulandites and Clinoptilolites, Clays and Clay Minerals, Vol. 46, No. 6, 679-686, 1998.

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, 395-40

Internet Links for Clinoptilolite-Ca URL:
Please feel free to link to this page.

Localities for Clinoptilolite-Ca

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.
(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.
  • Neuquén
    • Lácar department
      • Caleufú
Pablo Rodrigo Leal, María Elena Vattuone, and Carlos Oscar Latorre (2011) Zeolite assemblages from Northern Patagonian Andes, Argentina: A review. Revista Mexicana de Ciencias Geológicas, v.28, núm. 2, 2011, p. 212-225
  • Tavuš Province (Tavush)
    • Idzhevan
Pavel M. Kartashov data
  • Lower Austria
    • Waldviertel
      • Maria Laach am Jauerling
        • Zintring
Kolitsch, U. & Löffler, E. (2012): 1759) Apatit, Klinoptilolith-Ca, Meionit, Prehnit, Titanit, Zirkon und weitere Mineralien aus einem Steinbruch bei Zintring, Maria Laach am Jauerling, Waldviertel, Niederösterreich. Pp. 161-162 in Niedermayr, G. et al. (2012): Neue Mineralfunde aus Österreich LXI. Carinthia II, 202./122., 123-180.
      • Raabs an der Thaya
        • Eibenstein an der Thaya
Kolitsch, U., Schillhammer, H. & Lamatsch, P. (2015): 1936) Analcim, Axinit-(Fe), Chamosit, Datolith, Gips, Heulandit-Ca, Hyalit, Jarosit, Klinochlor, Klinoptilolith-Ca, Laumontit, Malachit, Molybdänit, Siderit, Sphalerit und Uraninit vom Steinbruch Hengl bei Eibenstein an der Thaya, Waldviertel, Niederösterreich. Pp. 243-245 in Niedermayr, G. et al. (2015): Neue Mineralfunde aus Österreich LXIV. Carinthia II, 205./125., 207-280.
  • 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.
  • Nova Scotia
    • Cumberland Co.
      • Parrsboro
PE-PIPER, G. and MILLER, L. (2002) Zeolite minerals from the North Shore of the Minas Basin, Nova Scotia, Atlantic Geology, 38, 1, 11-28. (Sample W180)
    • Kings Co.
PE-PIPER, G. and MILLER, L. (2002) Zeolite minerals from the North Shore of the Minas Basin, Nova Scotia, Atlantic Geology, 38, 1, 11-28.
      • Bay of Fundy
Canadian Mineralogist 38, 1215.
Canadian Mineralogist Vol 38 pp. 1215-1232 (2000)
  • Ontario
    • Timiskaming District
      • Cobalt-Gowganda region
        • South Lorrain Township
Reiner Mielke 2016
  • Québec
    • Laurentides
      • Argenteuil RCM
        • Wentworth
          • Laurel
Van Velthuizen et al. (2006) Mineral. Record 37, 283 [locality 48]
    • Montérégie
      • La Vallée-du-Richelieu RCM
        • Mont Saint-Hilaire
Horváth collection XRD & EMPA EDS
  • Larnaca District (Larnaka District; İskele District)
Prüfer, P. (2010): Mineralien der Insel Zypern. Der Aufschluss 61, 97-106. (in German)
Czech Republic
  • Bohemia (Böhmen; Boehmen)
    • Ústí Region
      • Děčín (Tetschen)
        • Krásná Lípa
P.Pauliš,L.Hrůzek,O.Janeček,J.Sejkora,R.Malíková,F.Fedyuk(2014)Dachiardite Ca and associated mineralization from Doubice-Vápenka near Krásná Lípa(Czech Rep.),Bull.Miner.-Petrolog.od.Národní Muzeum Praha,22,1,2014.
  • Bavaria
    • Lower Bavaria
      • Röhrnbach
Habel, M. (2009): Der Granodioritbruch der Fa. Josef Uhrmann OHG, Steinerleinbach bei Röhrnbach. Mineralien-Welt 20 (2), 66-86.
  • Borsod-Abaúj-Zemplén Co.
    • Zemplén Mts (Tokaj Mts)
      • Rátka
WDS - Norbert Zajzon
  • Heves Co.
    • Mátra Mts
      • Kisnána
GEODA, 2000
  • Veszprém Co.
    • Bakony Mts
Szakáll-Gatter-Szendrei: Mineral Species of Hungary, 2005
Indian Ocean
  • Ninety East Ridge (90° E Ridge; Indian Ridge)
    • D.S.D.P.
      • Leg 26
D. Besse et al. , Bell. Minéral. , 1981, 104, pp. 56-63.
Japan (TL)
  • Honshu Island
    • Tohoku Region
      • Fukushima Prefecture
Z. Kristallogr. 145, 216; Can. Mineral. (1997) 35, 1571
  • Kyushu Region
    • Fukuoka prefecture
Nendo Kagaku v.30, no.1 (1990)
New Zealand
  • North Island
    • Waikato
      • Thames-Coromandel
        • Whitianga
S. J. Mills, Museum Victoria
  • South Island
    • Canterbury
S. J. Mills, Museum Victoria
  • Canary Islands
    • Las Palmas Province
various added photos
        • La Aldea de San Nicolás
various added photos
  • England
    • Cornwall
      • St Just District
        • St Just
          • Botallack
            • Botallack Mine sett
J.Russell Socierty 2006, 68-71
  • Oregon
    • Clackamas Co.
RRUFF database specimen no. RO61098
    • Malheur Co.
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 562. RRUFF database specimen No.RO60662
    • Tillamook Co.
Wise, W.S. and Tschernich, R.W. (1976): Dachiardite-bearing zeolite assemblages in the Pacific Northwest, in: Sand, L.B. and Mumpton, F. (eds.): Natural Zeolites Occurrence, Properties, Use. Pergamon Press (Oxford, New York), pp. 105-111.
  • Washington
    • Douglas Co.
Tschernich (1991): Zeolites of Washington State. Rock & Minerals, 66(4); American Mineralogist, Volume 67, pages 799-803, 1982
    • Wahkiakum Co.
      • Altoona
Cannon, B. (1975): Minerals of Washington, p.75; Micro Probe Volume IX Number 3 Spring 2001
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