So, rocks are hard. But the scale we use to rank them, the Mohs scale, is only really good at quantifying that for one kind of hardness, and topaz is a perfect stone to talk about to explain that. And you can check it out in our SciShow...

You look really pretty, but what are you actually putting all over your face?

Discover the world of minerals and learn about their uses.
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Material processes - Classifying materi
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Learning Points
Minerals are naturally occurring substan
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Discover the softest mineral, talc, and how it is useful in sport.
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Material processes - Classifying materi
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Learning Poi
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Minerals have many uses
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Talc...

Dr. Forrester identifies five minerals.

This video explains the formation and identification of minerals. Major mineral groups, basic crystal systems, the physical properties of minerals, and everyday uses of minerals are discussed. Other terminology includes: inorganic,...