QuestionMay 12, 2025

Choose all the answers that apply. Which of the following minerals can be scratched with a fingernail? quartz talc topaz diamond

Choose all the answers that apply. Which of the following minerals can be scratched with a fingernail? quartz talc topaz diamond
Choose all the answers that apply. Which of the following minerals can be scratched with a fingernail? quartz talc topaz diamond

Solution
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Answer

Talc Explanation 1. Understand mineral hardness A fingernail has a hardness of about 2.5 on the Mohs scale. Minerals with a hardness less than or equal to 2.5 can be scratched by a fingernail. 2. Compare mineral hardness - Talc: Hardness = 1 (can be scratched). - Quartz: Hardness = 7 (cannot be scratched). - Topaz: Hardness = 8 (cannot be scratched). - Diamond: Hardness = 10 (cannot be scratched).

Explanation

1. Understand mineral hardness<br /> A fingernail has a hardness of about 2.5 on the Mohs scale. Minerals with a hardness less than or equal to 2.5 can be scratched by a fingernail.<br /><br />2. Compare mineral hardness<br /> - Talc: Hardness = 1 (can be scratched).<br /> - Quartz: Hardness = 7 (cannot be scratched).<br /> - Topaz: Hardness = 8 (cannot be scratched).<br /> - Diamond: Hardness = 10 (cannot be scratched).
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