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Clinoptilolite-K

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Formula:
K6(Si30Al6)O72 · 20H2O
System:
Monoclinic
Lustre:
Vitreous
Hardness:
3½ - 4
Name:
From the Greek klino - "oblique" ptylon - "feather" and lithos - "stone." Named as the monoclinic dimorph of "ptilolite" (mordenite).

Classification of Clinoptilolite-K

Approved, 'Grandfathered' (first described prior to 1959)
9.GE.05

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

Physical Properties of Clinoptilolite-K

Vitreous
Hardness (Mohs):
3½ - 4

Optical Data of Clinoptilolite-K

Type:
Biaxial (+/-)
RI values:
nα = 1.476 - 1.491 nβ = 1.479 - 1.493 nγ = 1.479 - 1.497
2V:
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:
Moderate
Dispersion:
r > v to r < v strong

Chemical Properties of Clinoptilolite-K

IMA Formula:
K6(Si30Al6)O72 · 20H2O
Mindat.org Formula:
K6(Si30Al6)O72·20H2O

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

Crystallography of Clinoptilolite-K

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

Type Occurrence of Clinoptilolite-K

Relationship of Clinoptilolite-K to other Species

Series:
Forms a series with Heulandite-K (see here)
Other Members of Group:
Clinoptilolite-CaCa3(Si30Al6)O72·20H2O
Clinoptilolite-NaNa6(Si30Al6)O72·20H2O
9.GE.05Clinoptilolite-CaCa3(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-K

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-K

Reference List:
Koyama, K. & Y. Takeuchi (1977), Clinoptilolite: The distribution of potassium atoms and its role in thermal stability: Zeitschrift für Kristallographie: 145: 216-239.

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

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.

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. J. Phys. Chem. 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, 395-40

Internet Links for Clinoptilolite-K

mindat.org URL:
https://www.mindat.org/min-6883.html
Please feel free to link to this page.

Localities for Clinoptilolite-K

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.
Bulgaria
 
  • 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.
Canada
 
  • Québec
    • Montérégie
      • La Vallée-du-Richelieu RCM
        • Mont Saint-Hilaire
Tillet collection
China
 
  • Heilongjiang Province (Manchuria; Dongbei Region)
    • Mudanjiang Prefecture
      • Muling Co.
Shouting Zhang, Pengda Zhao, Zhanzhang Xu, and Gengdong Yang (2004): Mineral Deposits 23(1), 31-38
Czech Republic
 
  • Moravia (Mähren; Maehren)
    • Moravia-Silesia Region
      • Příbor
Peter Fuchs
Hungary
 
  • Borsod-Abaúj-Zemplén Co.
    • Zemplén Mts (Tokaj Mts)
      • Rátka
WDS - Norbert Zajzon
Japan
 
  • Honshu Island
    • Tohoku Region
      • Yamagata Prefecture
        • Yonezawa City
Minato & Takano (1964) Nendo Kagaku, 4, 12-22.
Russia
 
  • Far-Eastern Region
    • Kamchatka Oblast'
Pavel M. Kartashov analytical data (1984)
USA
 
  • 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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