You were thinking of a mirror.
You said it is classified as Mineral, I say Other.
Does it get wet? You said Sometimes, I say No.
Can you find it in a church? You said Doubtful, I say Yes.
Can you use it at school? You said Rarely, I say Yes.
Does it display information? You said Yes, I say No.
Does it bring joy to people? You said Depends, I say Yes.
Would you find it in an office? You said Rarely, I say Yes.
Do you use it at night? You said Rarely, I say Yes.
OK, maybe I underestimate how often mirrors are used. Go teach it, it needs it.
Hmm, maybe it's not so stupid after all. I thought of a mother, and on the 11th answer it guessed 'Girlfriend'.
Then I thought of a toilet, and after the 19 answer it guessed 'Band (Group of musicians)'.