Granite and feldspar. The term "granitic" means granite-like and is applied to granite and a group of intrusive igneous rocks with similar textures and slight variations in composition and origin. These rocks mainly consist of feldspar, quartz, mica, and amphibole minerals, which form an interlocking, somewhat equigranular matrix of feldspar and quartz with scattered darker biotite mica and amphibole (often hornblende) peppering the lighter color minerals. Occasionally some individual crystals (phenocrysts) are larger than the groundmass, in which case the texture is known as porphyritic. A granitic rock with a porphyritic texture is known as a granite porphyry. Granitoid is a
Kokerbin Rock the summit are accessible by marked bush walks. The rock formations include a wave rock formation, Dog Rock and Devil's Marbles. On the western side of Kokerbin Rock is a historic stone well and an old school site, remainders of early European settlement. <mapframe text="Kokerbin Rock is located within the Kokerbin Nature Reserve" width=300 height=300 zoom=15 latitude=-31.88772 longitude=117.70484>{ "type": "ExternalData", "service": "geoshape", "ids": "Q16893567", }</mapframe> Kokerbin Rock Kokerbin Rock, also known as Kokerbin Hill, is a granite rock formation located within the Kokerbin Nature Reserve in the Wheatbelt region of Western Australia. The area has special significance for Noonga. There