Has anyone figured out a way to polish calcite? I know its soft but there must be a way. I gathered up some nice pink ornamental stone used to put around shrubs, etc. I put it through the Vibe with AO with no shine results. I run the polish cycle again with TO and still no results. I cushioned pretty well with ceramic and soap but it just didn't take a shine. Has any one been able to shine the stuff?
God of Multiple Parallel Universes Full of Rocks and Apprentice to THE ONE.
Calcite and the tumbler are not friends! Basically you end up with a calcite slurry! And polishing works pretty good with calcite. I tried cabbing some but pretty much failed as the calcite was just too soft for my heavy handed ways.
I can't tell if thats some Gneiss Schist, or that Schist is Gneiss. All I know is don't take it for Granite
Post by Hard Rock Cafe on Mar 7, 2011 11:48:20 GMT -5
Here's why it doesn't work in a tumbler, from wikipedia: "Calcite can be either dissolved by groundwater or precipitated by groundwater, depending on several factors including the water temperature, pH, and dissolved ion concentrations. Although calcite is fairly insoluble in cold water, acidity can cause dissolution of calcite and release of carbon dioxide gas. Calcite exhibits an unusual characteristic called retrograde solubility in which it becomes less soluble in water as the temperature increases. When conditions are right for precipitation, calcite forms mineral coatings that cement the existing rock grains together or it can fill fractures."
Some rocks aspire to greatness; others are destined to be grit carriers.
Post by deb193redux on Mar 9, 2011 14:33:08 GMT -5
tweaking the pH to prevent it dissolving is a very neat idea. I have a dim memory of something similar for cleaning iron off of calcite crystals without dissolving them. But I think soft still presents a problem.
mr.mohs: rockpickerforever yes I do -a refurbished Franton called- Welcome to the Machine- from BeefRock
Sept 26, 2014 21:42:52 GMT -5
broseph82: Going to be up early tomorrow for some more hounding!!
Sept 28, 2014 21:02:09 GMT -5
dale: Hi I'm new, hope this is the right place to ask a question. I want smooth (no rough or sharp edges) pea gravel about 3/8" max., natural untreated stone, don't care about polish or look, just need the smooth stones. Could I buy stones or tumble them?
Sept 29, 2014 8:03:56 GMT -5
Fossilman: The Dollar Stores amd Michaels carry such a thing...Thumbs up
Sept 29, 2014 8:19:05 GMT -5
Fossilman: YAAAAAAA!!!! Headed out to a new "Rock Store" called "Al's"...Heck I might come home with some goodies..
Sept 29, 2014 8:19:54 GMT -5