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Selenite and ?

0 votes

Hi,

the top stone is Selenite. But what is the other? I thought that is was discoloured selenite, but the layers are different. It does not scratch glass, I can scrape of some with my fingernail. alt text I'm guessing it is a gypsum or a calcite, but which one?

asked Mar 31, 2014 by Renata (7,820 points)

12 Answers

0 votes

It actually looks more like ulexite (aka "TV stone"). minerals.net/mineral/ulexite.aspx

answered Apr 1, 2014 by hershel (46,460 points)
0 votes

Thx Hershel, in my search I had already stumbled on ulexite, however it is not transparent enough. Or does that depend on the way the mineral has been cut/cultivated?

Is there a test I could do?

answered Apr 1, 2014 by Renata (7,820 points)
0 votes

I ran across borax, then tincalconite en then I found trona.

Do you think it might be trona?

answered Apr 1, 2014 by Renata (7,820 points)
0 votes

Can't guarantee the bottom piece, but the top piece is almost certainly ulexite. That's the way it typically looks and is readily available to collectors.

answered Apr 2, 2014 by hershel (46,460 points)
0 votes

Hi Hershel,

The top stone I bought as being selenite. If it is ulexite then I am a lucky girl...:)

However my question was about the stone below the selenite. I will add some better pictures.

answered Apr 2, 2014 by Renata (7,820 points)
0 votes

alt text

answered Apr 2, 2014 by Renata (7,820 points)
0 votes

alt text

answered Apr 2, 2014 by Renata (7,820 points)
0 votes

alt text

answered Apr 2, 2014 by Renata (7,820 points)
0 votes

alt text

answered Apr 2, 2014 by Renata (7,820 points)
0 votes

Looks like talc. Does it have a greasy feel? Can you scratch it with your fingernail?

answered Apr 3, 2014 by hershel (46,460 points)

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