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1,799 questions

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Orange/brown mineral

0 votes

It does not scratch glass and when put down to hard little almost square bits fall off. It leaves a white streak on a tile.

I was thinking citrine or tangarine quartz but that does not fit the hardness.

asked Apr 7, 2014 by Renata (7,840 points)

13 Answers

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answered Apr 7, 2014 by Renata (7,840 points)
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answered Apr 7, 2014 by Renata (7,840 points)
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answered Apr 7, 2014 by Renata (7,840 points)
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What you can't see in the picture is that when moved in light on certain flat angles it seems almost opaque.

answered Apr 7, 2014 by Renata (7,840 points)
0 votes

alt text

answered Apr 7, 2014 by Renata (7,840 points)
0 votes

I tried... sorry.

History? I don't know, I bought a box full of minerals on the dutch Craigs List...

answered Apr 7, 2014 by Renata (7,840 points)
0 votes

Its crystallized with banding - that color looks most like calcite from a limestone deposit such as a karst formation. Can you see if it bubble when you apply a strong acid to it (best way to do this is use a small medicine tube applicator for a baby medicine with acid.

answered Apr 8, 2014 by hershel (46,480 points)
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Hi Hershel,

For the fun of the experiment I tried freshly sqeeuzed lemon juice... nothing happened. Then I googled and I found that I could also use normal vinegar. And as you sugeested used small medicine tube for letting one drop fall. And looking through a magnifying glass I saw little bubbles show up; not vigourously but they were there.

That was fun and I did not know that I could use vinegar!

So... it is a calcite then?

Thx, Hershel.

answered Apr 8, 2014 by Renata (7,840 points)
0 votes

Yep! It effervesced, so its calcite! (or aragonite)

answered Apr 8, 2014 by hershel (46,480 points)
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If it was aragonit is should be a spoetnik shape, right?

Or does aragonite come in different shapes?

thx, Hershel.

answered Apr 8, 2014 by Renata (7,840 points)

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