anorthosite
91Cumulate rock — Cumulate rocks are igneous rocks formed by the accumulation of crystals from a magma either by settling or floating. Cumulate rocks are named according to their texture; cumulate texture is diagnostic of the conditions of formation of this group… …
92Windimurra intrusion — The Windimurra Intrusion is a giant ultramafic mafic intrusion emplaced within the Yilgarn craton of Western Australia. It is located approximately 100 kilometres south east of the town of Mount Magnet.ettingWindimurra is a conical sheet like… …
93Troctolite — is a rare ultramafic intrusive rock type. It consists essentially of variable amounts of olivine and calcic plagioclase along with variable minor pyroxene. It thus is midway between peridotite and anorthosite.Troctolite is found in some… …
94Myrmekite — describes a vermicular, or wormy, intergrowth of quartz in plagioclase. The intergrowths are microscopic in scale, typically with maximum dimensions less than 1 millimeter. The plagioclase is sodium rich, usually albite or oligoclase. These… …
95Timetable of the Precambrian — This is a timeline of geological and relevant astronomical events on Earth before the Cambrian period started. This covers 88% of the duration of the Earth. The dates given are based on the best current scientific evidence and where possible are… …
96Lingerbay — in Harris, Scotland, was the subject of one of the Western Isles s longest controversies.The original superquarry planning application, submitted in 1991, was to extract 600 million tonnes of anorthosite rock over a period of 60 years, from an… …
97Europium anomaly — The Europium anomaly, in geochemistry, is the phenomenon whereby Europium (Eu) concentration is either depleted or enriched in a rock relative to the other rare earth elements (REEs). A Eu anomaly is said to be negative if Eu is depleted relative …
98Angeles Forest Highway — The Angeles Forest Highway traverses the Angeles National Forest and connects the Los Angeles basin to the Antelope Valley by going up and over the San Gabriel Mountains. The highway is variously known as County Road N 3 or FH 59 or the Palmdale… …
99Kornerupine — is a rare boro silicate mineral with formula: (Mg,Fe2+)4(Al,Fe3+)6(SiO4,BO4)5(O,OH)2. It crystallizes in the orthorhombic dipyramidal crystal system as brown, green, yellow to colorless slender tourmaline like prisms or in massive fibrous forms.… …
100Pilbara craton — The Pilbara craton (the Pilbara province in northwest Western Australia), along with the Kaapvaal craton (the Kaapvaal province of South Africa) are the only remaining areas of pristine Archaean 3.6 2.7 Ga crust on Earth. Similarities of their… …
