Below you can find the 3 minerals on the mohs scale can be scratched with a copper penny: calcite gypsum & this Jeopardy Words Answer. The answer to 3 minerals on the mohs scale can be scratched with a copper penny: calcite gypsum & this has 4 letters. This clue belongs to the Geology category and is part of Jeopardy Word Level 442. If you scroll near the bottom you will find other clues and answers part of level 442