The system diopside-nepheline-leucite

Gupta, Alok K. ; Lidiak, Edward G. (1973) The system diopside-nepheline-leucite Contributions to Mineralogy and Petrology, 41 (3). pp. 231-239. ISSN 0010-7999

Full text not available from this repository.

Official URL:

Related URL:


The system diopside-nepheline-leucite, representing a join in the undersaturated part of the system nepheline (Ne)-kalsilite (Ks)-CaO-MgO-SiO2, has been investigated at atmospheric pressure. The system is pseudoternary and cuts the primary phase volumes of forsterite solid solution (Foss), diopside solid solution (Diss), nepheline solid solution (Ness), carnegieite solid solution (Cgss), and leucite solid solution (Lcss). Melilite (Mel) occurs as a subliquidus phase. The phase diagram has two four-phase points: 1. one at 1275 ± 5°C and Di60Ne8Lc32 where liquid coexists with Foss, Diss and Lcss, corresponding to olivine (Ol) leucitite; 2. the other at 1194 ± 5°C and Di27.5Ne29.5Lc43 where Ness, Foss and Lcss coexist with liquid, corresponding to Ol-Ne italite. With decreasing temperature, liquid moves from point (1) to a five-phase assemblage (3) where liquid is in equilibrium with Foss, Diss, Mel and Lcss (1258 ± 5°C), which is representative of Ol-Mel-leucitite. From point (2) liquid moves to a second five-phase assemblage (4), where Foss, Mel, Ness, Lcss and liquid are in equilibrium (1175 ± 5°C, corresponding to a Lc-Ne katungite. The assemblage Foss+Ness+Diss+Mel+Lcss+ liquid, is reached between 1168° and 1100° C and corresponds to Ol-Mel-Ne leucitite. Foss reacts with liquid and disappears. Near the point (1) it disappears at 1135 ± 10°C, whereas near the point (2) it reacts out at 1060 ± 10°C. Near the join Di-Ne it disappears at 950 ± 10°C. The final assemblage in the system is representative of Mel-Ne leucitite.

Item Type:Article
Source:Copyright of this article belongs to Springer-Verlag.
ID Code:23998
Deposited On:01 Dec 2010 12:47
Last Modified:02 Jun 2011 10:21

Repository Staff Only: item control page