| HEU |
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Framework Type HEU
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| Type Material | ||||
| Material Name: | Heulandite | |||
| Chemical Formula: | |Ca2+4 (H2O)24| [Al8Si28 O72]-HEU | |||
| Unit Cell: | ||||
| monoclinic | Cm (# 8) | |||
| a = 17.718Å | b = 17.897Å | c = 7.428Å | ||
| α = 90.0 ° | β = 116.42 ° | γ = 90.0 ° | ||
| Framework density: | 17.1 T/1000 Å3 | |||
| Channels: | {[001] 10 3.1 x 7.5* + 8 3.6 x 4.6*} <-> [100] 8 2.8x 4.7* (variable due to considerable flexibility of framework) (2-dimensional) | ||
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10-ring viewed along [001]
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8-ring, also along [001]
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8-ring viewed along [100]
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| References: | ||
| Alberti, A."On the Crystal Structure of the Zeolite Heulandite",
Tschermaks Min. Petr. Mitt., 18, 129-146 (1972) Merkle, A.B. and Slaughter, M."The crystal structure of heulandite (Ca,Na2)[Al2Si7O18]·6H2O", Am. Mineral., 52, 273-276 (1967) |
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