Here are some terms used to describe the texture of rocks and minerals:

* Smooth: Feels like polished glass or silk.

* Rough: Feels jagged or uneven.

* Gritty: Feels like sandpaper.

* Soft: Can be easily scratched with a fingernail.

* Hard: Resistant to scratching.

* Porous: Has many small holes or spaces.

* Crystalline: Feels like many small, sharp points.

* Earthy: Feels like soil or clay.

* Waxy: Feels like a candle.

* Greasy: Feels slippery, like it's coated in oil.

You can also describe the feel of a mineral by how it feels in your hand:

* Warm: Feels warm to the touch.

* Cold: Feels cold to the touch.

* Heavy: Feels dense and heavy for its size.

* Light: Feels light for its size.

So, when describing the texture of a rock or mineral, you can talk about its smoothness, roughness, hardness, softness, porosity, and other tactile qualities.