SME
Mineralogy · Problem type
A mineral’s class from its formula
Use this for “Which mineral class does pyrite, FeS₂, belong to?”
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Which anion or group sets its class?
Tap a card, then tap its group.
Look past the metal to the anion: SiO₄, CO₃, O, S, SO₄, a halogen, or nothing at all.
Assumptions
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Minerals are classed by their anion or anion group, since minerals sharing it have similar structures.
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A native element is one element alone, with no anion at all.
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Water in a formula (·2H₂O) does not change the class: gypsum is still a sulfate.
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