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Any Ideas about this 4 Unknown Minerals?

0 votes

1) Looks like Agate but it's like a rock

a) alt text

b) alt text

2) Yellow Crystal

alt text

3) Brown Rock ( Looks like a Crystal and it's shiny)

alt text

4) White Crystal

alt text

asked Apr 14, 2014 by Tagiadin John (2,070 points)

12 Answers

0 votes

Hi,

Top 3 all look like calcite to me.

The last one could be quartz with some inclusions.

Can you tell anything about the hardness of the stones? Do they scratch glass? Or does glass scratch on the mineral?

answered Apr 15, 2014 by Renata (7,820 points)
0 votes

Only the last one scratches glass

answered Apr 15, 2014 by Tagiadin John (2,070 points)
0 votes

Then that is not a calcite; rather a white quartz or agate.

answered Apr 15, 2014 by Renata (7,820 points)
0 votes

Ok then thanks for your help!

answered Apr 15, 2014 by Tagiadin John (2,070 points)
0 votes

The top banded ones look like travertine as indicated by the banding habit and color. The best way to test is with an acid test - apply a small amount of acid and see if it effervesces.

answered Apr 18, 2014 by hershel (46,480 points)
0 votes

It reacts to Hydrochloric acid (HCL) , it dissolves

answered Apr 19, 2014 by Tagiadin John (2,070 points)
0 votes

http://www.minerals.net/mineral-variety/mineral/travertine.aspx

It is a calcite.

Great that you did the acid test! Did it bubble vigorously?

answered Apr 19, 2014 by Renata (7,820 points)

It doesn't react so vigorously but it makes potholes wherever I put the acid

1) http://mfi.re/watch/qu9sg5dxosf92kd/M4H08326.MP4

2) http://mfi.re/watch/fen271b5c5o49wg/M4H08327.MP4

The videos are on Mediafire they are not infected with viruses , there you can see how they react.

0 votes

That really cool; thanks for sharing!

answered Apr 20, 2014 by Renata (7,820 points)
0 votes

I recorded how they react with HCL but it seems that only the sound was uploaded , sorry .

answered Apr 20, 2014 by Tagiadin John (2,070 points)
0 votes

I downloaded the videos; no problem there!

answered Apr 21, 2014 by Renata (7,820 points)

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