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Lapidary / Gemstone Community Forum
June 15, 2019, 10:40:55 pm
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Kent
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« on: December 04, 2015, 07:56:21 am »

I was lucky enough to meet an older gentleman that had a storage shed full of rocks his geologist father spent a lifetime collecting. We became friends and he needed to empty the shed, so I helped him out. Filled the back of my truck full....I've got rocks from all over the world include those labeled "Victoria Falls" and "Mt. Rainier". I'm still going through it and finding treasures. 

I've got LOTS of this material. Its somewhat crystalline on its edges, cuts and grinds extremely easily and take a super polish. All of it has the same pinkish/white coloring.

Onyx perhaps ?

Cheers,

Kent


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Talusman
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« Reply #1 on: December 04, 2015, 08:19:41 am »

Pretty banding. How hard is it? Does it react in vinegar? I have some carbonate rock that looks similar.

-Jeremy
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Kent
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« Reply #2 on: December 04, 2015, 08:25:35 am »

React to vinegar ? Like how ? 
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itsandbits1
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« Reply #3 on: December 04, 2015, 09:54:36 am »

limestone? acid; vinager, should make it fizz
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The wheels of life go round and round, round and round, round and round, and then they hit a rock

Talusman
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« Reply #4 on: December 04, 2015, 10:10:32 am »

Yup - limestone/calcite/aragonite will all give off bubbles when placed in acid (vinegar). Can take a minute to get started, but should be apparent. If left in long enough, pieces exposed above the surface will grow aragonite crystals (sometimes sold as "flowering rocks") :)
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Kent
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« Reply #5 on: December 07, 2015, 03:21:12 pm »

I finally got some vinegar and tested this stone. No reaction at all. The piece has been in the vinegar half the day...

It is fairly soft, I can scratch it with a dental pick.Here's a piece I just finished. Polishes easy and to a high gloss. 

Any clues folks ?


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southerly
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« Reply #6 on: December 07, 2015, 03:48:44 pm »

I would still be on aragonite/calcite.

David
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bilquest
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« Reply #7 on: December 08, 2015, 09:17:28 am »

Looks like onyx to me. Onyx was one of my very first cabs and I remember how excited I was at how easily it took a polish. As a beginner I assumed that all rocks would work up as nicely, but little did I know, the challenge was just beginning.
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Kent
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« Reply #8 on: December 08, 2015, 12:14:35 pm »

OK, the closest I can get with the help of Google images is Mexican banded calcite, also called Mexican Onyx.

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bobby1
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« Reply #9 on: December 08, 2015, 01:59:25 pm »

My thoughts were banded onyx
Bob
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Ranger_Dave
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« Reply #10 on: December 08, 2015, 02:15:24 pm »

Have you tried long wave UV on it?
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Kent
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« Reply #11 on: December 08, 2015, 05:51:32 pm »

No, I need a new bulb......

What would I be looking for ?

Kent
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Ranger_Dave
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« Reply #12 on: December 08, 2015, 08:52:51 pm »

If it contains calcite it should fluoresce orange to red under LW.
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