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.
thesterlingseraph: Hello, I am hoping someone here can lead me in the right direction. I have a 4.5" circular slab of very rare bright green Victoria Stone/Imori I am looking to sell. Does anyone know anyone who specializes in Victoria Stone? The slice is from the 1960's-70s
Sept 1, 2014 20:05:32 GMT -5
kk: thesterlingseraph Please read the forum rules and associated sediments about selling here. Thus far you have not even introduced yourself, how can you expect someone even bother to answer your request in any form or way?
Sept 1, 2014 21:24:07 GMT -5
Fossilman: KK speaks for all of us too!
Sept 1, 2014 21:59:21 GMT -5
wampidy: Forum is going crazy today. Posting is almost impossible and when it does go through it puts up two or three copies. Spoiled I guess, we have not had any problems for quite a while.
Sept 1, 2014 23:14:40 GMT -5
glennz01: is someone hacking the site?
Sept 1, 2014 23:16:33 GMT -5
glennz01: I cant even access some topics
Sept 1, 2014 23:17:22 GMT -5
wampidy: The guest poster is me.
Sept 1, 2014 23:17:35 GMT -5
glennz01: I thought you couldn't post as a guest
Sept 1, 2014 23:22:02 GMT -5
glennz01: If anyone knows what a good price is for selling tumbled stuff please send me a pm.... I'm currently only thinking about $4/ lb (thinking about selling to local gift shops)
Sept 1, 2014 23:24:48 GMT -5
glennz01: A new record... the site posted my thing in 4 posts!
Sept 1, 2014 23:33:22 GMT -5
glennz01: whos going to fix it
Sept 1, 2014 23:33:39 GMT -5
Fossilman: No problem on my end with the forum..
Sept 2, 2014 9:35:23 GMT -5
rockpickerforever: glennz01, you can delete duplicate posts by opening the offending post, clicking on the gear at the upper right of the post, and clicking delete. No harm, no foul. Sometimes the forum slows way down, keep clicking create post, and you will each time!
Sept 2, 2014 17:27:14 GMT -5