41. The distinctive character of feldspar in hypersolvus granite is to present exsolution textures. 42. That is because the high temperature feldspar was perthitic. 43. From Hauterivian to Albion ages the sandstones are more mixed with more feldspar . 44. Feldspar -phyric basalt lava flows are normally pillowed.45. Mineralogically the fine-grained phenocrysts consist of quartz, feldspars and biotite. 46. Minerals in the tonalite are quartz, plagioclase, alkali feldspar and hornblende. 47. The hill is composed of feldspar porphyry, its summit of compacted feldspar. 48. The hill is composed of feldspar porphyry, its summit of compacted feldspar . 49. Centrex has developed a process to convert potassium feldspar into potassium fertiliser products. 50. The underlying geology consists of rocks rich in quartz, feldspar , and mica.
