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A gabbroid typically has over 35% mafic minerals, mostly pyroxenes or olivine, while a dioritoid typically has less than 35% mafic minerals, which typically includes hornblende. [11] Gabbroids form a family of rock types similar to gabbro, such as monzogabbro, quartz gabbro, or nepheline-bearing gabbro. Gabbro itself is more narrowly defined ...
A dioritoid typically has less than 35% mafic minerals, typically including hornblende, while a gabbroid typically has over 35% mafic minerals, mostly pyroxenes or olivine. [9] The name diorite (from Ancient Greek διορίζειν , "to distinguish") was first applied to the rock by René Just Haüy [ 10 ] on account of its characteristic ...
Baddeleyite was first found in Sri Lanka in 1892. It can be found in numerous terrestrial and extraterrestrial rocks. Some of these terrestrial rocks are carbonatite, kimberlite, alkaline syenite, some rocks of layered mafic intrusions, diabase dikes, gabbroid sills and anorthosite. [5]
In the Paleocene and the Eocene, the North Mesotethys Ocean closed, forming the Shachrud-Nishapoor thrusted-folded arc and the Eastern Iran transverse folded system.This led to the incorporation of Turkmenistan, Iran and Afghanistan into the larger Eurasian Plate.
Gneiss (/ n aɪ s / nice) is a common and widely distributed type of metamorphic rock.It is formed by high-temperature and high-pressure metamorphic processes acting on formations composed of igneous or sedimentary rocks.
An obelisk is a microscopic genetic element that consists of a type of infectious agent composed of RNA.Described as a "viroid-like element", they consist of RNA in a circular rod shape without any protein shell coating.
Pigeonite is a mineral in the clinopyroxene subgroup of the pyroxene group. It has a general formula of (Ca,Mg,Fe)(Mg,Fe)Si 2 O 6.The calcium cation fraction can vary from 5% to 25%, with iron and magnesium making up the rest of the cations.
Napier's bones is a manually operated calculating device created by John Napier of Merchiston, Scotland for the calculation of products and quotients of numbers. The method was based on lattice multiplication, and also called rabdology, a word invented by Napier.