| 11. | Leucite lavas from which feldspar is absent are divided into the leucitites and leucite basalts.
|
| 12. | Leucite lavas from which feldspar is absent are divided into the leucitites and leucite basalts.
|
| 13. | At Vesuvius it occurs as alterations from gypsum within leucite tephrite and as fumarole deposits.
|
| 14. | This pseudo-cubic character of leucite is very similar to that of the mineral boracite.
|
| 15. | They are of trachytic appearance, containing phenocysts of sanidine, leucite, augite and biotite.
|
| 16. | Other minerals occurring in the rock include sanidine, andradite, fassaite, leucite and hauyne.
|
| 17. | It is associated with other minerals typical of undersaturated environments, namely leucite, cancrinite and natrolite.
|
| 18. | Those leucite rocks which contain abundant essential plagioclase feldspar are known as leucite tephrites and leucite basanites.
|
| 19. | Those leucite rocks which contain abundant essential plagioclase feldspar are known as leucite tephrites and leucite basanites.
|
| 20. | Those leucite rocks which contain abundant essential plagioclase feldspar are known as leucite tephrites and leucite basanites.
|
