| # | Clue | Answer As Given | Value | Round | Category | Air Date | Show |
|---|---|---|---|---|---|---|---|
| This mineral rates a 1 (softest & easiest to scratch) on the Mohs scale | talc | $2,000 | DJ | 4-LETTER SCIENCE | 2016-02-17 | #7238 | |
| Because it's heat resistant, this softest of all minerals is used to line stoves | talc | $800 | DJ | SCIENCE | 1993-10-27 | #2103 | |
| While soapstone can refer to any greasy rock, it usually applies to one made of this soft mineral | talc | $400 | J | SCIENCE | 1993-04-08 | #1989 | |
| In its solid form, this soft mineral is called steatite or soapstone | talc | $1,000 | DJ | SCIENCE | 1991-02-11 | #1491 |