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What is this? https://www.gemologyonline.com/Forum/phpBB2/viewtopic.php?f=19&t=9263 |
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Author: | cnl [ Thu Sep 03, 2009 5:39 pm ] |
Post subject: | What is this? |
I found a brown (ugly?) stone not far from where I live. Since I am always looking for weird things to cut I give almost any material a chance... so I cut it and made a quick polish just to get a view of how it would look like and if I could use it in one my jewellery pieces... Do you have any idea what it could be? |
Author: | Barbra Voltaire, FGG [ Thu Sep 03, 2009 6:01 pm ] |
Post subject: | |
Hardness? |
Author: | cnl [ Thu Sep 03, 2009 6:26 pm ] |
Post subject: | |
I would say around 3-4. Matrix: White Some veins with darker (green) minerals which should be >3-4 in hardness. Probably Pyrite may be seen in some spots on the back off the stone. The green spots is black on the brown decomposed surface. |
Author: | Conny Forsberg [ Sat Sep 10, 2011 4:31 am ] |
Post subject: | Re: What is this? |
As I suppose its a rock found in Sweden I would suggest some kind of calcium based mineral. It looks similar to the mix of marble and diopside found around Sala silvermine, the pyrite specks are also common there. |
Author: | cascaillou [ Thu Sep 15, 2011 3:01 pm ] |
Post subject: | Re: What is this? |
If it doesn't scratch glass then it's not a quartz based rock, maybe it's calcite based such as marble. Calcite reacts to a tiny droplet of white vinegar with effervescence (I suggest trying white vinegar first as this acid acts softly, but you'll need to watch closely to see the effervescence). |
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