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gmelinite : ウィキペディア英語版
gmelinite

Gmelinite-Na is one of the rarer zeolites but the commonest member of the gmelinite series, gmelinite-Ca, gmelinite-K and gmelinite-Na. It is closely related to the very similar mineral chabazite. Gmelinite was named as a single species in 1825 after Christian Gottlob Gmelin (1792–1860) professor of chemistry and mineralogist from Tübingen, Germany, and in 1997 it was raised to the status of a series.〔Deer, Howie and Zussman (2004) Rock-Forming Minerals Volume 4B:690-696〕
Gmelinite-Na has been synthesised from Na-bearing aluminosilicate gels.〔 The naturally occurring mineral forms striking crystals, shallow, six sided double pyramids, which can be colorless, white, pale yellow, greenish, orange, pink, and red. They have been compared to an angular flying saucer.
== Structure ==

The aluminosilicate framework is composed of tetrahedra linked to form parallel double six-membered rings stacked in two different positions (A and B) in the repeating arrangement AABBAABB. The framework has no Al-Si order.〔 Within the structure there are cavities with a cross-section of up to 4 Å, and also wide channels parallel to the c axis with a diameter of 6.4 Å.〔Senderov and Shishakova (1967) Russian Chemical Bulletin 16-1:151〕 Space group: P63/mmc. Unit cell parameters:〔 a=13.72 Å, c=9.95 Å, Z=4.

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