7. What gives the gem amethyst its purplish color?
A. Quartz
B. Titanium
C. Oxygen
D. Iron
The answer was not A, got this question wrong.
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D.�Iron
Silicon dioxide. Its purple coloring is usually caused by impurities of iron or manganese compounds.
To determine the correct answer to the question, "What gives the gem amethyst its purplish color?", let's examine the options provided.
A. Quartz: Amethyst is a type of quartz, and while quartz can be colorless or occur in various colors, the presence of impurities contributes to the purple color in amethyst. Therefore, option A is a plausible answer.
B. Titanium: Titanium is not directly responsible for the color of amethyst. While titanium can contribute to the coloration of certain gemstones, it is not the primary factor for the purplish hue in amethyst.
C. Oxygen: Oxygen, by itself, does not determine the color of amethyst. Oxygen is naturally found in the Earth's atmosphere and is not directly linked to the coloration of gemstones.
D. Iron: Iron impurities are one of the main factors that give amethyst its purplish color. When iron is present in the quartz crystal lattice, it can lend a range of shades from light lavender to deep violet.
Based on this information, the correct answer is option D. Iron is responsible for giving the gem amethyst its purplish color.