[DOC] [TLE] Mafic vs. Felsic - U. of Oregon [PAR] These are both made up words used to indicate the chemical composition of 
silicate minerals, magmas, and igneous rocks. ... magnesium and the FIC from 
the Latin word for iron, but mafic magmas also are relatively enriched in calcium 
and... [DOC] [TLE] 10(e) Characteristics of Igneous Rocks - Physical Geography [PAR] As described in some of the previous topics, igneous rocks are produced by the 
... tend to be rich in minerals composed of silicon, potassium, and aluminum. ... 
Mafic magma produces igneous rocks rich in calcium, iron, and magnesium and 
are ... with the formation of rocks that are primarily composed of the mineral 
olivine. [DOC] [TLE] Igneous Rock Concepts - Geology Class [PAR] IGNEOUS ROCKS AND IGNEOUS PROCESSES. Introduction. Magma- Molten 
rock material composed mostly of . Magmas may also include dissolved gases... [DOC] [TLE] mafic rock | igneous rock | Britannica.com [PAR] These minerals are high in magnesium and ferric oxides, and their presence 
gives... ... Mafic and ultramafic rocks (those composed primarily of... [DOC] [TLE] Geology Chapter 4 Flashcards | Quizlet [PAR] rich in iron and/or magnesium and comparatively low in silica. ... igneous rocks 
composed almost entirely of light-colored silicates- quartz and potassium 
feldspar. ... fine-grained mafic igneous rock containing substantial amounts of 
dark colored .... and composed primarily of pyroxene and calcium-rich 
plagioclase feldspar. [DOC] [TLE] Magmas and Igneous Rocks [PAR] The major silicate rock forming elements are O, Si, Al, Fe, Mg, K, Na and Ca. ... 
Igneous rocks are composed primarily of the rock-forming silicate minerals. ... 
and high amounts of Fe and Mg, and low Al are referred to as mafic in 
composition. [DOC] [TLE] Igneous rock - Wikipedia [PAR] Igneous rock is one of the three main rock types, the others being sedimentary 
and ... Igneous and metamorphic rocks make up 9095% of the top 16 km of the 
.... of quartz, and in rocks with no feldspar or quartz, the type of iron or 
magnesium .... The continental crust is composed primarily of sedimentary rocks 
resting on a... [DOC] [TLE] Composition of the crust - Chemical elements, Minerals, Rocks [PAR] More than 90% of the crust is composed of silicate minerals. ... in humid hot areas 
contains aluminum hydroxides and is primarily mined for aluminum. ... Rocks that 
contain lots of pyroxenes like basalt and gabbro contain Mg also but to a lesser 
extent. ... It is common in mafic igneous rock like the diabase sample above. [DOC] [TLE] Igneous Rocks [PAR] An Igneous rock is the product of cooled solidified magma/lava. ... Mafic rocks are 
darker colored and are mostly made up of magnesium and iron. ... igneous rock 
that cooled very slowly and formed large grains would be described as having a
... [DOC] [TLE] Chapter 4 - Igneous Rocks [PAR] Texture is used to describe the overall appearance of a rock based on the size, 
shape, and ... Igneous rocks are composed primarily of silicate minerals ... Dark 
silicates and calcium-rich feldspar; Termed mafic (magnesium and ferrum, for 
iron)... [DOC] [TLE] Olivine - Rock-Forming Minerals - Sandatlas [PAR] Olivine is a common mineral in dark-colored igneous rocks because these ... 
Magnesium and iron can replace each other in all proportions. ... series after a 
Canadian geologist Norman Bowen who first described it. ... (composed of 
feldspar and silica) and basaltic rocks are referred to as mafic rocks (magnesium 
+ ferric). [DOC] [TLE] Igneous rocks - Sandatlas [PAR] Mafic and ultramafic plutonic rocks have their own classification diagrams ... and 
phonolite have a strictly defined boundaries on the TAS diagram which ... Unlike 
other igneous rocks which are mostly composed of silicate minerals, ... Basalt 
contains lots of iron and magnesium which are used to make pyroxenes and 
olivine. [DOC] [TLE] Illinois State Geological Survey Description of Minerals and Rocks ... [PAR] Felsic igneous rocks are made up primarily of feldspar and quartz (silica). Mafic 
igneous rocks are made up primarily of minerals rich in iron and magnesium. [DOC] [TLE] Igneous Rocks - Tulane University [PAR]

Question: Igneous rocks described as mafic are primarily made up of magnesium & this
Answer: iron