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Heulandite-K

Big Photo

Kamfjord Quarry, Vesterøya, Sandefjord, Vestfold, Norway
© OT. Ljostad

Show Heulandite-K Photos (2)
Formula:
(K,Na,Ca)
 
2-3
Al
 
3
(Al,Si)
 
2
Si
 
13
O
 
36
·12H
 
2
O
System:MonoclinicColour:White, Colorless, Red, ...
Lustre:Vitreous, PearlyHardness:3 - 3½
Name:Named after the English mineral collector, John Henry Heuland (1778-1856), a British mineral collector and dealer. The Potassium-dominant member of the heulandite series.


The potassium analogue of Heulandite-Ba, Heulandite-Ca, Heulandite-Na, and Heulandite-Sr. Clinoptilolite-K-Heulandite-K Series.

Classification of Heulandite-K

IMA status:Approved
Strunz 8th edition ID:8/J.23-08
Nickel-Strunz 10th (pending) edition ID:9.GE.05

9 : SILICATES (Germanates)
G : Tektosilicates with zeolitic H2O; zeolite family
E : Chains of T10O20 Tetrahedra
Dana 7th edition ID:77.1.4.1
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Type Occurrence of Heulandite-K

Type Locality:Albero Bassi, Schio, Vicenza Province, Veneto, Italy

Physical Properties of Heulandite-K

Lustre:Vitreous, Pearly
Diaphaneity (Transparency):Transparent, Translucent on thin edges
Colour:White, Colorless, Red, Yellow, Brown, Green
Streak:White
Hardness (Mohs):3 - 3½
Tenacity:Brittle
Cleavage:Perfect
perfect on the {010}

Crystallography of Heulandite-K

Crystal System:Monoclinic
Class (H-M):2/m - Prismatic
Space Group:B2/m (B1 1 2/m) [C2/m] {C1 2/m 1}
Cell Parameters:a = 7.46Å, b = 17.84Å, c = 15.88Å
Ratio:a:b:c = 0.418 : 1 : 0.89
Unit Cell Volume:V 2 ų
Z:2

Optical Data of Heulandite-K

Type:Biaxial (+)
RI values: nα = 1.476 - 1.506 nβ = 1.479 - 1.510 nγ = 1.479 - 1.517
2V:Measured: 10° to 48°
Maximum Birefringence:δ = 0.003 - 0.011

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:Moderate
Dispersion:r > v

Chemical Properties of Heulandite-K

Formula:
(K,Na,Ca)
 
2-3
Al
 
3
(Al,Si)
 
2
Si
 
13
O
 
36
·12H
 
2
O
Essential elements:Al, H, K, O, Si
All elements listed in formula:Al, Ca, H, K, Na, O, Si

Relationship of Heulandite-K to other Species

Series:Forms a series with Clinoptilolite-K (see here)
Related Minerals - Nickel-Strunz Grouping):

- +
9.GE.05Clinoptilolite-Ca
(Ca,Na,K)
 
2-3
Al
 
3
(Al,Si)
 
2
Si
 
13
O
 
36
·12H
 
2
O
9.GE.05Clinoptilolite-K
(K,Na,Ca)
 
2-3
Al
 
3
(Al,Si)
 
2
Si
 
13
O
 
36
·12H
 
2
O
9.GE.05Clinoptilolite-Na
(Na,K,Ca)
 
2-3
Al
 
3
(Al,Si)
 
2
Si
 
13
O
 
36
·12H
 
2
O
9.GE.05Heulandite-Ca
(Ca,Na)
 
2-3
Al
 
3
(Al,Si)
 
2
Si
 
13
O
 
36
·12H
 
2
O
9.GE.05Heulandite-Na
(Na,Ca)
 
2-3
Al
 
3
(Al,Si)
 
2
Si
 
13
O
 
36
·12H
 
2
O
9.GE.05Heulandite-Sr
(Sr,Na,Ca)
 
2-3
Al
 
3
(Al,Si)
 
2
Si
 
13
O
 
36
·12H
 
2
O
9.GE.05Heulandite-Ba
(Ba,Ca,K,Na,Sr)
 
5
Al
 
9
Si
 
27
O
 
72
·22H
 
2
O
9.GE.10Stilbite-Ca
NaCa
 
4
[Al
 
9
Si
 
27
O
 
72
] · nH
 
2
O
9.GE.10Stilbite-Na
Na
 
3
Ca
 
3
[Al
 
8
Si
 
28
O
 
72
]·nH
 
2
O
9.GE.15Barrerite
(Na,K,Ca
 
0.5
)
 
2
[Al
 
2
Si
 
7
O
 
18
] · 7H
 
2
O
9.GE.15Stellerite
Ca[Al
 
2
Si
 
7
O
 
18
] · 7H
 
2
O
9.GE.20Brewsterite-Ba
(Ba,Sr)[Al
 
2
Si
 
6
O
 
16
] · 5H
 
2
O
9.GE.20Brewsterite-Sr
(Sr,Ba,Ca)[Al
 
2
Si
 
6
O
 
16
] · 5H
 
2
O
Related Minerals - Dana Grouping):

- +
77.1.4.1Heulandite-Ca
(Ca,Na)
 
2-3
Al
 
3
(Al,Si)
 
2
Si
 
13
O
 
36
·12H
 
2
O
77.1.4.1Heulandite-Na
(Na,Ca)
 
2-3
Al
 
3
(Al,Si)
 
2
Si
 
13
O
 
36
·12H
 
2
O
77.1.4.1Heulandite-Sr
(Sr,Na,Ca)
 
2-3
Al
 
3
(Al,Si)
 
2
Si
 
13
O
 
36
·12H
 
2
O
77.1.4.3Stilbite-Ca
NaCa
 
4
[Al
 
9
Si
 
27
O
 
72
] · nH
 
2
O
77.1.4.3Stilbite-Na
Na
 
3
Ca
 
3
[Al
 
8
Si
 
28
O
 
72
]·nH
 
2
O
77.1.4.5Barrerite
(Na,K,Ca
 
0.5
)
 
2
[Al
 
2
Si
 
7
O
 
18
] · 7H
 
2
O

Other Names for Heulandite-K

Other Languages:
Russian:Гейландит-K

Other Information

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

References for Heulandite-K

Reference List:Merkle, A.B., and M. Slaughter (1968), Determination and refinement of the structure of heulandite: American Mineralogist: 53: 1120-1138.

Alberti, A. (1972), On the crystal structure of the zeolite heulandite: Tschermaks Mineralogische und Petrographische Mitteilungen: 18: 129-146.

Comodi, P., G.D. Gatta, & P.F. Zanazzi (2001), High-pressure structural behavior of heulandite: European Journal of Mineralogy: 15: 247-255.

Articles/Blogs about Heulandite-K

Internet Links for Heulandite-K

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    Localities for Heulandite-K

    Hide Locality List
    The 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.
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    (TL) indicates type locality. ? 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.
    Italy
     
    • Veneto
      • Vicenza Province
        • Monte di Malo
          • Contrada Vanzi
    		Carbonin, S., Manzone, A., Boscardin M., Pegoraro, S. (2003): Zeoliti del Vicentino: caratterizzazioni chimiche e ottiche nella serie dell'heulandite. Rivista Mineralogica Italiana, 4, 186-195.
        • Schio
          • San Rocco di Tretto
    		S.Carbonin, A.Manzone, M.Boscardin,S.Pegoraro (2003) - Zeoliti del Vicentino: heulandite - Rivista Mineralogica Italiana , 28 (4) 186 - 195
        • Valdagno
          • Cerealto
    		Boscardin, M., Checchi, A., Filippi, F., Guglielmino, S., Pegoraro, S., Pretto, G., Zattra, A. (1998): Offretite del Veneto. Rivista Mineralogica Italiana, 1/1998, 25-30.
    Norway
     
    • Vestfold
      • Sandefjord
        • Vesterøya
    		No reference listed
    Russia
     
    • Northern Region
      • Murmanskaja Oblast'
        • Kola Peninsula
          • Khibiny Massif
    		Pekov, I.V. & Podlesnyi, A.S. (2004): Kukisvumchorr Deposit: Mineralogy of Alkaline Pegmatites and Hydrotermalites. Mineralogical Almanac, vol. 7, 140 pages + xxiv photo's pages
          • Lovozero Massif
    UK
     
    • England
      • Cornwall
        • St Just District
          • Botallack - Pendeen Area
            • Botallack
              • Botallack Mine
    		J. Russell Socierty 2006, 68-71
    Mineral and/or Locality
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