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A further classification is based on the silica saturation of the rock; silica saturated Acidic, silica poor Basic; this classification does not refer to the amount of free silica — ie Quartz — in the rock, but to the total silicate in the minerals present. In addition, Intermediate rocks are those showing mixed acid and basic characteristics; Ultra-basic or Ultra-mafic are silica depleted and contain rare oxides. Note, the acid-basic categorisation is not that of chemists redox pH divisions.
The lighter coloured minerals are termed Felsic, the darker ferromagnesian, Mafic; the relative proportions roughly determining the colour of the rock; hence acid rocks which have a high felsic content are generally paler than the basic types with higher mafic minerals. It may be relevant here to digress to the effects of decreasing silica content on mineralogy as mentioned earlier. Feldspars and Feldspathoids comprise the bulk of the felsic minerals, their relationships mentioned above, but feldspars are the larger rock-forming group and are subdivided into potassic K feldspar and sodic-Na and calcic-Ca combined Na and Ca form the Plagioclase sub-group varieties.
They are generally pale coloured, whites, greys to pinks and almost colourless. K feldspars, predominantly Orthoclase and Sanidine, are characteristic of the more acidic rocks — dacite, trachyte and rhyolites. The Plagioclase group are a chemical continuous substitution series of 6 recognised minerals between the two end members Albite Na end and Anorthite Ca end. The more sodic members are associated, in general, with more acid rocks, calcic with basic. The minerals of the 6 divisions are identified by name and analysis notation of the Albite Ab :Anorthite An ratio thus:.
Pyroxenes and Amphiboles combined, are the main mafic rock forming mineral groups in volcanic rocks and as in the feldspars, both exhibit chemical substitution series between end-members in their respective groups. Pyroxenes are a large complex group of chain silicates — so called from the molecular strucure of the minerals — and they are subdivided on a crystallographic basis into 2 sub-groups, Ortho- and Clino-pyroxenes of the Orthorhombic and Monoclinic crystal groups respectively.
