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Feldspar ( / ˈfɛl ( d) ˌspɑːr / FEL (D)-spar; sometimes spelled felspar) is a group of rock-forming aluminium tectosilicate minerals, also containing other cations such as sodium, calcium, potassium, or barium. [3] The most common members of the feldspar group are the plagioclase (sodium-calcium) feldspars and the alkali (potassium-sodium ...
- 6.0–6.5
Dec 16, 2022 · The important feldspar end members are albite (NaAlSi 3 O 8), anorthite (CaAl 2 Si 2 O 8), and orthoclase (KAlSi 3 O 8). In Figure 6.34, the blue region shows the compositions of naturally occurring feldspars. Natural feldspars form two distinct series, the alkali feldspar series and plagioclase, both labeled on this triangular diagram. Alkali ...
Apr 4, 2024 · feldspar, any of a group of aluminosilicate minerals that contain calcium, sodium, or potassium. Feldspars make up more than half of Earth’s crust, and professional literature about them constitutes a large percentage of the literature of mineralogy. Of the more than 3,000 known mineral species, less than 0.1 percent make up the bulk of Earth ...
Aug 10, 2019 · Feldspars are hard minerals, all of them with a hardness of 6 on the Mohs scale. This lies between the hardness of a steel knife (5.5) and the hardness of quartz (7). In fact, feldspar is the standard for hardness 6 in the Mohs scale. Feldspars usually are white or nearly white, though they may be clear or light shades of orange or buff.
- Andrew Alden
Nov 24, 2023 · There are two main types of chemical weathering. On the one hand, some minerals become altered to other minerals. For example, feldspar is altered—by hydrolysis—to clay minerals. On the other hand, some minerals dissolve completely, and their components go into solution. An example is calcite (CaCO 3) which is soluble in acidic solutions.
Jan 21, 2024 · It contains a mixture of sodium, potassium, calcium, and barium, arranged in a variety of crystal types. Feldspar plays a key role in forming and shaping many of the Earth’s many rock types ...
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Feldspar is the name of a large group of rock-forming silicate minerals that make up over 50% of Earth's crust. [1] They are found in igneous, metamorphic, and sedimentary rocks in all parts of the world. Feldspar minerals have very similar structures, chemical compositions, and physical properties. Common feldspars include orthoclase (KAlSi 3 ...
