![]() ![]() Other known polymorphs are Kyanite and andalousite (chiastolite) and Diamond and graphite. However, they both form very different crystals. For example, both calcite and aragonite have the same chemical formula (CaCO3). To complicate matters, two different minerals can have the same chemical formula with different crystal structures. However, a crystal can consist of several substances (and therefore also minerals). Popular crystals of 1 mineral are: rock crystal, amethyst, citrine, calcite and ruby.Īs we saw in the description of a mineral, it can only consist of 1 substance. Just like ice crystals (snowflakes) or nanocrystals made by man (not natural). This is an organic substance and therefore cannot be a mineral. This has to do with the fact that not every crystal meets the conditions to be a mineral. ![]() We already read that every mineral is automatically a crystal. What is the difference between minerals and crystals?
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