Feldspar group

In this case, it is not necessary to overcome an energy barrier for nucleation to occur. Decomposition into two phases occurs without involving the process of nucleation. Separation into two phases in this type of system is called spinodal decomposition, and is seen among silicate minerals such as the pyroxene and feldspar groups. Generally, the boundaries between the two phases are wavy rather than flat, but the two phases are in a specific crystallographic relation. [Pg.148]

The various members of the feldspar group show many characteristics in common. Crystallizing in the monoclime and irieiinie systems, they show similarity of crystal habit, cleavage and other physical properties as well as similar chemical relationships,... [Pg.606]

Minerals of the feldspar group are for example used in fine and coarse ceramics. [Pg.103]

Plagioclase sodium/calcium aluminosilicate mineral of the feldspar group... [Pg.5078]

The pure members of the feldspar group are (refer to Table 7) sodium feldspar (albite, triclinic) — Na20. AI2O3. 6 SiO ... [Pg.22]

The sodium concentration of soils is determined by the geological origin of the rocks. All minerals of the feldspar group (sodium feldspar, potassium feldspar, calcium feldspar), potassium mica and hornblende are rich in sodium. The same applies to the clay minerals montmorillonite and illite. [Pg.500]

Figure 5.5 shows a crystal of anorthite, CaAl2Si208, a member of the feldspar group. The crystal is centrosymmetric. For each face (hkl) there is a parallel face... [Pg.220]

Feldspar group gems aluminum silicates in combination with calcium, potassium, or sodium... [Pg.653]

Tectosilicate subclass Quartz Si02 Feldspar group minerals... [Pg.10]

A substantial proportion of fine grained quartz, micas and feldspar group minerals are present in many types of natural clays, still these minerals are not considered as clay minerals. Why What would be the possible effect of the increase of the proportion of these minerals in a clay ... [Pg.21]

From 2690474 to 2691059, and 2701852, 2702086, 2702107, 2704654 various colours and pigments, mainly spinels. 2704235 Bone Ash 2706599 Portland cement flue dust 2706667 Feldspar group minerals 2957317 Nonoxide glasses. [Pg.104]

Subgroups are sometimes necessary, such as clinopyroxene and orthopyroxene in the pyroxene group, or plagioclase which has six different species and belongs to the feldspar group. [Pg.378]

Aluminium group Feldspar group Silicates group Aualcime Andesine Anorthite Bytownite Kaolinite Labradorite Montmoiillonite Oligoclase... [Pg.3]

Chlorite group Clay minerals group Cobalt group Feldspar group Metal pigments Mica group Aluminium Aluminium hydroxide,... [Pg.7]

Aluminium group Chlorite group Clay minerals group Feldspar group Mica group Sheet silicates group Silicates group ... [Pg.9]

Anorthite is a calcium aluminosilicate mineral with composition CaAl2Si20g. It is one of the rarer members of the feldspar group iq.v. ), being an end-member of the albite-anorthite (q.v.) plagio-clase feldspar series (Kempster et al., 1962). Anorthite occurs in many igneous and higher grade metamorphic rocks and is notably found in Lake County, California and Franklin, New Jersey (USA) and Monte Somma and Valle di Fassa (Italy). [Pg.14]

Clay minerals group Feldspar group Albite... [Pg.14]

Anorthoclase is a white member of the alkali feldspar group q.v) of silicates, with composition (Na,K)AlSi30j (Fieri and... [Pg.14]

Bytownite is a member of the feldspar group q.v) of minerals with a composition between that of albite and anorthite (qq.v). It is thus... [Pg.67]

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