You are studying the mineral hornblende, Ca2 Mg5(OH)2(Si4 O11)2, and find samples in which isomo

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You are studying the mineral hornblende, Ca2 Mg5(OH)2(Si4...

You are studying the mineral hornblende, $\mathrm{Ca}_2 \mathrm{Mg}_5(\mathrm{OH})_2\left(\mathrm{Si}_4 \mathrm{O}_{11}\right)_2$, and find samples in which isomorphous substitution of the magnesium and the calcium has occurred. Which of the following are possible minerals that could result from isomorphous substitution processes in hornblende? a. $\mathrm{Y}_2 \mathrm{Mg}_5(\mathrm{OH})_2\left(\mathrm{Si}_4 \mathrm{O}_{11}\right)_2$; b. $\mathrm{Na}_2 \mathrm{Mg}_5(\mathrm{OH})_2\left(\mathrm{Si}_4 \mathrm{O}_{11}\right)_2$; c. $\mathrm{Na}_2 \mathrm{Mg}_3\left(\mathrm{Fe}^{\mathrm{III}}\right)_2(\mathrm{OH})_2\left(\mathrm{Si}_4 \mathrm{O}_{11}\right)_2$; d. $\mathrm{Y}_2 \mathrm{Mg}_3 \mathrm{Li}_2(\mathrm{OH})_2\left(\mathrm{Si}_4 \mathrm{O}_{11}\right)_2$; e. $\mathrm{Sr}_2 \mathrm{Mg}_5(\mathrm{OH})_2\left(\mathrm{Si}_4 \mathrm{O}_{11}\right)_2$.

You are studying the mineral hornblende, $\mathrm{Ca}_2 \mathrm{Mg}_5(\mathrm{OH})_2\left(\mathrm{Si}_4 \mathrm{O}_{11}\right)_2$, and find samples in which isomorphous substitution of the magnesium and the calcium has occurred. Which of the following are possible minerals that could result from isomorphous substitution processes in hornblende?
a. $\mathrm{Y}_2 \mathrm{Mg}_5(\mathrm{OH})_2\left(\mathrm{Si}_4 \mathrm{O}_{11}\right)_2$;
b. $\mathrm{Na}_2 \mathrm{Mg}_5(\mathrm{OH})_2\left(\mathrm{Si}_4 \mathrm{O}_{11}\right)_2$;
c. $\mathrm{Na}_2 \mathrm{Mg}_3\left(\mathrm{Fe}^{\mathrm{III}}\right)_2(\mathrm{OH})_2\left(\mathrm{Si}_4 \mathrm{O}_{11}\right)_2$;
d. $\mathrm{Y}_2 \mathrm{Mg}_3 \mathrm{Li}_2(\mathrm{OH})_2\left(\mathrm{Si}_4 \mathrm{O}_{11}\right)_2$;
e. $\mathrm{Sr}_2 \mathrm{Mg}_5(\mathrm{OH})_2\left(\mathrm{Si}_4 \mathrm{O}_{11}\right)_2$.

Key Concepts

Crystal Chemistry

Crystal chemistry deals with the arrangement of atoms in a mineral's structure and the impact of chemical substitutions on the mineral's properties. Understanding crystal chemistry is essential when examining how different substitutions affect the stability, symmetry, and overall chemical formula of a mineral.

Solid Solution Series

A solid solution series occurs when a mineral exhibits a continuous range of compositions due to the substitution of one ion for another. This concept is important when studying minerals that can vary compositionally, as it explains how different but closely related mineral species can form through geochemical processes.

Isomorphous Substitution

Isomorphous substitution refers to the process in which one ion in a crystal lattice is replaced by another of similar size and charge without significantly altering the overall crystal structure. This concept is fundamental in mineralogy, as it explains how minerals can incorporate different chemical elements while maintaining their structural framework.

Ionic Size and Charge Compatibility

A critical aspect of isomorphous substitution is that the substituting ions must closely match the ionic radius and charge of the ion they replace. This ensures that the crystal lattice remains stable and that the mineral can form a solid solution series along with variations in its composition.

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