There is an undeniable excitement that comes with cracking open a rock tumbler after weeks of relentless grinding. The sheer transformation of rough, jagged stones into smooth, tactile treasures is impressive, but the true magic lies in the anticipation of what is uncovered when the sludge is finally washed away. In our latest tumbling session, we cracked open two of our massive barrels that have been running in 60/90 grit, sifting through the gooey, gray muck to see what hidden masterpieces we could uncover.
The Mechanics of the Tumble: Patience and the Perfect Slurry
When you are working with large tumblers, patience is the ultimate key to success. Both of these barrels were allowed to run for an extended period—probably around 10 days [12:56]. While that extra time breaks the grit down completely and creates an incredibly sludgy, smooth mess inside the barrel [00:53], it works wonders on the stones. In fact, that extended time creates such an incredibly fine finish, smoothing the stones so well that they already have a visible sheen and feel like they could jump straight to the 1500-grit stage or even right to polish [10:05].
Of course, the messy part of tumbling is dealing with that spent slurry! Carefully dumping the barrel without splashing gray muck everywhere [01:29] and rinsing the stones down reveals what you have actually achieved. And just like any good tumbling batch, it’s critical to include plenty of smaller stones—like little amethysts and rose quartz [02:25, 09:11]—to act as the cushioning media that helps shape and protect the larger “target stones” we put inside.
Hits, Misses, and Masterpieces
Tumbling rough rock is always a game of chance, but running the barrels extra long paid off beautifully this time. Here are a few of the most striking reveals from our two barrels:
- Banded Eye Agates:Â We pulled an absolute showstopper from the first barrel [03:16]. The extended time perfectly smoothed it out to reveal unbelievable colors and a stunning array of “eyes.” The matte finish is so spectacularly smooth and tactile [10:41] that it almost feels counterintuitive to polish it any further!
- Indian Red Zebra Jasper: The second barrel produced an absolutely beautiful piece of this material [07:51]. Once rinsed off, it revealed a stunning and vibrant mix of red, yellow, green, black, and white [08:03, 12:08].
- Classic Bloodstone:Â You can make some spectacular display pieces if you tumble the right kind of large bloodstone pieces [08:42]. The massive chunk we pulled out has incredible color and is already throwing a noticeable pre-polish flash when held in the light [11:56].
- Amethyst and Rose Quartz:Â The smaller filler stones didn’t disappoint either! Rinsing off the gray muck revealed some incredibly vibrant, lovely little amethysts [02:35] that make all the messy work worth it.
- Red Crazy Lace:Â We also tested out some red crazy lace agate from a new pallet we recently purchased [04:12]. It came out beautifully with vibrant color [11:14], though agates with deep fractures will occasionally hold onto a little bit of grit in the cracks that needs to be scrubbed out.
Whether it is a monster chunk of bloodstone [12:23] or a pair of perfectly smooth eye agates [03:52], every single barrel opening is a brand-new discovery.
If you are looking to start your own tumbling projects, be sure to browse our shop for high-quality tumbling and rough rock and let the lapidary adventure begin!
