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Author Topic: Amethyst  (Read 5364 times)

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Offline lpsumo

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Amethyst
« on: June 22, 2015, 01:23:44 PM »
I found some amethyst last week and don't know how to clean it up. I attached some pics

The little piece is pretty clean but has some scale on it, the big piece is the size of my fist and is mostly scaled up.

No idea what the scale is, I assume acid will take it off but I don't want to damage the crystal

Any tips are helpful

 [ Invalid Attachment ]

Offline Top Cat

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Re: Amethyst
« Reply #1 on: June 23, 2015, 05:41:15 AM »
Find someone with a rock tumbler it will remove the crud. It is done in 4 different stages using different grits. Takes about 4 weeks.

I wouldn't use any acid on it,

Good Luck

Offline azau

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Re: Amethyst
« Reply #2 on: June 23, 2015, 07:02:36 AM »
Here is a link that might help you.  Cleaning mineral specimens: a guide for mineral collectors and field
  collectors on home techniques.
 

Also this.  
https://www.google.com/webhp?sourceid=chrome-instant&rlz=1C1AFAB_enUS491US513&ion=1&espv=2&ie=UTF-8#q=how%20to%20clean%20mineral%20specimens

It should be noted that Amethyst is a form of quartz.

Using a tumbler may knock the crud off of it but it will also round the crystal edges so it will lose it's character as a crystal specimen if that is what you want to end up with.

Good luck.

Offline EMF

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Re: Amethyst
« Reply #3 on: June 23, 2015, 08:53:04 AM »
The only acid that could damage amethyst is hydrofloric acid, something very dangerous and quite difficult to obtain. Muriatic acid, aka hydrochloric acid, will remove the scale if it is a carbonate mineral, and it will have no effect on the amethyst. As azau noted, tumbling will change the shape of the specimen. You might end up degrading its quality if tumbling is the method used for scale removal.

Offline lpsumo

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Re: Amethyst
« Reply #4 on: June 23, 2015, 11:41:15 AM »
Thanks for the tips guys

I read the articles azau posted, seems oxalic acid is hard to get in Canada. I checked Lowes, Rona, Home Depot, and Dulux. Home Hardware carries a wood bleach but I need to order it online and I don't know if it has the active ingredient I want.

I'll head down to my local rock shop and see what they think.

I have some HCl but I would need a lot of it to be able to soak this piece, a cheaper alternative would be handy.

Offline bruno

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Re: Amethyst
« Reply #5 on: June 23, 2015, 12:47:51 PM »
Home Depot does have in store a Behr All In One wood cleaner that has oxalic acid in it. It is able to clean the rust off my mineral samples

Offline lpsumo

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Re: Amethyst
« Reply #6 on: July 03, 2015, 10:25:29 AM »
 [ Invalid Attachment ]

All cleaned up

Offline EMF

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Re: Amethyst
« Reply #7 on: July 07, 2015, 02:52:52 PM »
Nice clean up! What did you use?

Offline sunshine

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Re: Amethyst
« Reply #8 on: July 08, 2015, 07:20:20 AM »
If you have patience, you can also put them in a bath of coke cola for a few days with no risk of damage to the crystals. 
See my YouTube channel for fun amateur video:
https://www.youtube.com/channel/UCnz8kX6AZOeZbRt0F9XqVJA

Offline lpsumo

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Re: Amethyst
« Reply #9 on: July 08, 2015, 08:03:52 PM »
I soaked it in dilute HCl for a couple days. Scrubbed it with a tooth brush every 12 hours or so.