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I've been sent these rocks by a friend, but I am truly awful at identifying them because they aren't my field at all.

I know some of them, but I was wondering if you could classify them all for me so I don't get any of them wrong?

enter image description here

enter image description here

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closed as off-topic by user12525, trond hansen, Semidiurnal Simon, Fred, Erik Aug 29 at 9:53

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  • "Questions about rock identification requests are off-topic. For more information, see the announcement on meta." – Community, trond hansen, Semidiurnal Simon, Fred, Erik
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    $\begingroup$ Do you have any more information than the pictures? Do you know where they came from? Which ones do you know? Can you describe them to us - do any appear to contain inclusions of different material - if so what shape/colour of material? Are you willing to test the hardness? Can they scratch glass or be scratched with a knife? I would guess by looking that all but the blue and maybe the pink ones are forms of quartz but it is hard to tell without more to go on. $\endgroup$ – haresfur Dec 22 '14 at 4:44
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    $\begingroup$ I'm with @haresfur on this. These rocks are obviously ornamental, so using any destructive method to try identify them is out of the question. My suggestion is to try and scratch glass with them (of course, a glass that no one needs or is hidden). If it scratches the glass, it's most likely a form of quartz. If it doesn't it could be anything. $\endgroup$ – Gimelist Dec 22 '14 at 7:03
  • $\begingroup$ All the rocks look like they've been polished in a tumbler. Looking at the picture of the rocks in your hand, the white rock to the right of all the rocks looks like quartz & the purple one on the bottom left could be amethyst. The others I don't know. $\endgroup$ – Fred May 7 '15 at 9:05
  • $\begingroup$ Just wanted to point to my remark about dyed stones on Gary's answer. $\endgroup$ – kwinkunks Mar 29 '16 at 12:31
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Bluish purple stone: Best case: Charoite (Google image it) Most likely: agate

Pinkish Purple: Might be sugilite Most likely purple agate looks natural

Pale blue: Blue lace agate

Green: Adventurine: quartz with mica

Brown-translucent (2): smoky quartz (Look carefully and see if you see silver/golden hairs... if so you have rulitated smoke quartz

Pale Yellow-Green: Most likely quartz... if it feels heavier than the blue lace agate it might be beryl.

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    $\begingroup$ I just wanted to add that decorative polished stones are often dyed and sometimes 'crackled'. This articles explains the processes, and the best minerals for dyeing. I'm not saying these are dyed, though I have my suspicions about the blue and the purple, but it's worth knowing. $\endgroup$ – kwinkunks Mar 29 '16 at 12:31

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