That rock you found clearly has something special, something that drew you in, inspired you to pick it up, and urged you to take it home with you… but it could be better.
A thorough polishing session can take a rock from remarkable to down-right resplendent, and you don’t even need any fancy, expensive machinery to do it!
Polishing rocks by hand is a lengthy but incredibly rewarding endeavor and is considered the safest way to spruce up your minerals.
So, if you’re not sure what the properties of your prize piece are, and you’re worried a tumbler will do more damage than good, using the grabbers God gave you is the perfect solution.
Consider me your rock polishing rudder, guiding you through this challenging process, ensuring your rocks come out looking fly, and most importantly, intact.
Let’s dive in!
Preliminary Cleaning
Polishing is technically a finishing technique, so before we can shine our rocks up, it’s important we prepare them correctly, and we can do so by giving them a good wash.
You’re going to need…
- A bowl or basin
- A medium-to-firm bristle brush
- Dish soap… maybe
If you’re cleaning a lot of rocks, you can speed this stage up by using a pressure washer on its lowest setting (something like the Sun Joe SPX3001 will be just the ticket).
To clean just one or a couple rocks, it’s best to continue by hand…
Step 1 — Soak Your Rock
First, fill a bowl or basin with fresh cold water, submerge your rock, and leave it to rest for about 10 minutes or so.
Some particularly soft rocks or minerals containing iron ore don’t fare too well in water, but a short dip shouldn’t cause any problems.
Step 2 — Scrub Your Rock
Grab that brush of yours and give it a good scrub.
If you have both a medium and firm bristle brush, start with the medium and inspect your progress after 5 minutes.
If it’s failing to remove debris, move on to the tougher brush.
Step 3 — Scrub With Dish Soap (If Necessary)
Doing battle with some particularly stubborn grime? Feel free to introduce some mild dish soap to the equation and continue brushing.
Rinse clean when you’re ready to start polishing.
Basic Hand Polishing
Now your rock is good and clean, you can hit it with some basic hand polishing, by which I mean using sandpaper with various grits to work out imperfections in the finish and remove any pesky calcium or iron deposit that just won’t seem to get lost.
The trick here is to use the heavier grit sandpaper first to work out all the rough edges quickly, then, by increments, move on to lighter grit sandpaper to get a good polish going and a silky smooth surface.
But be wary, for optimal results, you need to be patient here. A thorough clean and polish can take hours of work.
Basic Hand Polishing Guide
Here’s what you’re going to need:
- Your rock
- Some 80 grit sandpaper (possibly)
- A lot of 600 grit sandpaper
- An equal amount of 1200 grit sandpaper
- And one final stash of 3000 grit sandpaper
- A polishing compound
- A denim rag or wool felt polishing cloth
- Very fine polishing compound (around the 0.2 mark)
Step 1 — Cutting Or Securing Your Sandpaper
You have two options to begin with.
You can either cut your sandpaper into smaller 1–2” squares, or you can secure the entire sheet down on a steady surface.
If you choose to slice rather than secure, bear in mind that each square will only hold its grit for about 5 minutes, so you’ll need A LOT of them!
In light of this, securing the entire sheet of paper on a surface is often the quicker option.
You can do so with 3M Super 77 spray adhesive, and to remove the adhesive when you’re done, use some mineral spirits.
Step 2 — 600 Grit Sandpaper
With your heaviest grit sandpaper, start working the rough edges of your rock.
600 is typically the most effective grade, but for particularly stubborn rocks or deposit, you may consider going even heavier, which is why I included 80 grit sandpaper on the supplies list.
Your goal here is to buff the surface of your rock with the 600-grade until you stop seeing an improvement in the surface quality.
You can expect to be stuck doing this for a while, especially if you have multiple rocks to get through, so make sure you’re comfortable and ready for the long haul.
Step 3 — 1200 Grit Sandpaper
As I’m sure you’ve guessed, you’re now going to repeat the process with your 1200 grit sandpaper.
Again, buff until results plateau. Use small circular motions to minimize accidental marking.
Step 4 — 3000 Grit Sandpaper
Once more with feeling! — And a finer sandpaper.
Step 5 — Make Up Your Polish
Add water to your polishing compound to make a polishing paste, then use your denim rag or wool felt cloth to buff your rock to an even more resplendently shiny and silky smooth finish.
Rinse the excess paste off at intervals to assess your progress. Not sure which polishing compound to use?
Well, if I’m ever unsure of a rock’s composition, this compound from the folks over at National Geographic is my go-to, as it’s guaranteed to be the most versatile, and thus, a safe bet — they know rocks better than anyone!
Step 6 — Mix A Fine Polish
Before we can call this a job well done, use your ultra-fine compound to prepare a delicate polishing solution, then go to town with your denim rag or wool felt cloth.
Polish until you’re satisfied with the shine or until you stop seeing an improvement in surface quality.
Final Thoughts
Voilà! You’ve just polished a rock by hand, but now that your rock is gleaming, you want to keep it that way, right?
So it’s important to hit it with some minor maintenance from time to time.
Don’t worry; you won’t have to go through this whole process again for a while, but once in a while, it pays to…
- Dust your rock
- Apply more standard rock polish
- Apply more fine rock polish
Do this one a month or so, and you’ll never lose that satisfying shine!