| 31. | It occurs in hornfels and siliceous marble xenoliths within and adjacent to a nepheline syenite intrusion.
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| 32. | In places the nepheline syenite assumes the form of a dark rock with large rounded white spots.
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| 33. | During the alkali syenite crystallization, the carbonate portion of silicate magma was separated forming carbonatitic magma.
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| 34. | Lujavrite is a rare variety of nepheline syenite having amphibole, aegirine pyroxene, nepheline and feldspar.
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| 35. | Biotite is rare, because in a syenite magma the formation of feldspar consumes nearly all the aluminium.
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| 36. | The segregation of the silica from the melt leaves it in a state that may favour syenite formation.
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| 37. | Close associations between syenite and monzogranites are common, particularly in post-orogenic extensional / transtensional settings.
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| 38. | This mineral occurs as an anchimonomineral veinlet that cross-cuts poikilitic nepheline syenite ( Hawthorne 2012 ).
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| 39. | Some of these terrestrial rocks are carbonatite, kimberlite, alkaline syenite, some rocks of sills and anorthosite.
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| 40. | The tomb is a syenite stone from the Vitosha mountains where Vazov loved to walk . ( ) ]]
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