| Additionally, lamproites may contain leucite, richterite, sanidine, and occasionally nepheline, whereas kimberlites do not. |
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| Familiar examples include nepheline, leucite, and members of the sodalite and cancrinite groups. |
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| Early reports of leucite from this locality were shown to be an erroneous identification of analcime. |
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| The three commonest feldspathoids are leucite, nepheline, and sodalite. |
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| The crystal form represents the formation of leucite as an isometric mineral. |
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| Properties of nepheline, leucite, sodalite, and cancrinite are summarized below. |
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| Geologic observations of this region were recorded as early as 1869 by the Hayden Survey, and by 1874 Endlich had reported leucite from Table Mountain. |
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| A new leucite glass-ceramic with which you may fully concentrate on the important factors of the restorations, i.e. shade selection, function and surface structure. |
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| This is not surprising since the PFM veneer that has leucite reinforcing crystals that improve fracture toughness. |
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| Figure 3 demonstrates that during the heat-treatment program, part of the phlogopite was transformed to the forsterite and leucite phases. |
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| The most important property of feldspar is its tendency to form crystalline mineral leucite when melted. |
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| This statistical market research report covers feldspar, leucite, nepheline and nepheline syenite. |
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| The amount of crystallized leucite influences properties such as strength and thermal expansion. |
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| Cattella, Flexural strength optimisation of a leucite reinforced glass ceramic, Dental Materials Vol. |
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| They may be of considerable size like the grey, rounded leucite crystals found on the sides of Vesuvius. |
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| Varieties rich in leucite and haüynite are well known. |
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| Minerals of the feldspathoid group whose silica contents are less than those of their feldspar analogues include nephelin, leucite, sodalite, and cancrinite. |
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| Silica minerals thus occur only in magmas containing more than about 47 percent by weight of SiO2 and are incompatible with minerals with low cation:silica ratios such as olivine, nepheline, or leucite. |
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| The crystal form of leucite indicates the conditions under which it was crystallized, and the tetragonal structure shows that it has undergone post-crystallization inversion. |
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| With the corresponding mixture and targeted heat treatment of these glasses, leucite crystals with a defined grain size distribution are released in the glass matrix. |
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| The glass ceramic as claimed in claim 1, characterized in that the needles or columns which form the leucite crystals form groups of needles or columns. |
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| Leucite is nothing but potassium aluminium silicate mineral with large co-efficient of thermal expansion compared with glasses. |
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