Four questions. Five answers. Which one doesn't belong?

The five answers

Crepuscular
Halite
Mycology
Obsidian
Tungsten

The questions

What is the name given to animals that are active mainly at dawn and dusk?
What is the study of fungi called?
Which element is represented by the symbol W?
Which mineral is the primary component of ordinary table salt?

Reveal the answers

Crepuscular
Mycology
Tungsten
Halite

The False Five: Obsidian

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