Dacite consists mostly of plagioclase feldspar with biotite, hornblende, and pyroxene (augite and/or enstatite). Their commonest minerals are olivine, anorthite, hornblende, augite, biotite and leucite. It is commonly associated with quartz, potassium feldspar, biotite, hornblende and magnetite. Subhedral hornblende and elongated biotite grains are present. Gold occurs in quartz veins traversing in BIF, metavolcanics, and hornblende and biotite gneiss. The mineral assemblage is typically dominated by plagioclase plus pyroxene or hornblende. The rocks contain phenocrysts of clinopyroxene, hornblende and plagioclase. The major accessory minerals of TTG rocks include biotite, amphiboles (e.g. hornblende), epidote, and zircon. It may contain minor amounts of hornblende, biotite and other minerals. They occur along with other types of pyroxene gneiss, hornblende gneiss, amphibolites, etc. Nepheline is very abundant and there is also cancrinite, sodalite, scapolite, calcite, biotite and hornblende. They consist essentially of feldspar with hornblende (generally of brown color) and pale pyroxene. Clinopyroxene+orthopyroxene+amphibole (hornblende and pargasite) or amphibole+biotite+minor amounts of pyroxene are subordinate components. Andesites from the old cone are classified as hornblende and pyroxene andesites. The granite generally consists of quartz, hornblende, and feldspars.