This species has low Si content, about 27 per unit cell, and high water, 23 to 25 H 2 O per cell. Alkali-dominant heulandite (heulandite-Na and heulandite-K), which has the highest Si, limited at T Si = 0.80 or Si/Al = 4.0 by the definition of the species, …

Unit cell dimensions are given for two different contracted phases, phase 1 and phase B of a dehydrated heulandite from Cape Blomidon, Nova Scotia. The phases appear at temperatures as low as 202"C -+ 3". For 11 heulandites and clinoptilolite the initiat change to phase 1 occurs at from 213"C to 312'C -+ 3'

Explore the zeolite HEU crystalline lattice structure of K0.215Na0.63Ba0.03Sr0.025Ca1.785Mg0.005Al4.685Si13.35O36 [H2O]13.01 with lattice parameters, 3d interactive image of unit cell, cif file, lattice constants & more.

As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams. Please only use the official IMA–CNMNC symbol. Older variants are listed for historical use only. Warr, …

1998年5月1日 · Heulandite-clinoptilolite zeolites can be synthesized over the complete range of Si/Al ratio (2.5 to 6) found for the natural minerals. The unit cell parameters, framework infrared vibrational characteristics and thermal properties are similar to those of their natural counterparts.

2001年1月1日 · the unit-cell parameters for heulandite are distinct from those for clinoptilolite, but the sensitivity of the unit-cell parameters to ch anges in water content (e.g. Bish 1984) makes...

Unit cell dimensions are given for two different contracted phases, phase I and phase B of a dehydrated heulandite from Cape Blomidon, Nova Scotia. The phases appear at temperatures as low as 202°C ± 3°.

The crystal structure of heulandite is characterized by large intersect- ing channels composed of l2-, 10-, and S-member rings open across the mirrors and tied together by layers of 6-, 5-, 4-member ring groups located at heights of about f and t along 6.

In this paper a heulandite is described in which cavities or channels normally unoccupied by water contain nearly six molecules of water, giving a unit cell content of nearly 30 instead of the usual near 24. X-ray and chemical data. During investigation of zeolitic alteration

Heulandite (Ca;Na2)Al2Si7O18² 6H2O °c 2001 Mineral Data Publishing, version 1.2 Crystal Data: Monoclinic. Point Group: 2=m: Crystals commonly tabular k f010g, and elongated, widest at the center, hence called \co±n-shaped," to 12 cm; also granular to massive. Twinning: With f100g as twin and contact plane. Physical Properties: Cleavage ...