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Heavy rock identify help
  
  Index -> FOR BEGINNERS: What is it? Where is it from?
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convento




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PostPosted: Nov 18, 2017 15:06    Post subject: Heavy rock identify help  

hello, bring this rock from a mountain in north portugal.liked it because of the colours, diferent from the others near it.
Just curious to know what is it, as i do not understand nothing from rocks and minerals. so any help would be good, as it's my first rock. thank you!



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 Description:
Braga
60 cms
 Viewed:  287 Time(s)

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DSC01486.JPG
 Description:
Braga
60 cms
 Viewed:  290 Time(s)

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DSC01487.JPG
 Description:
 Viewed:  287 Time(s)

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DSC01488.JPG
 Description:
 Viewed:  290 Time(s)

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DSC01489.JPG
 Description:
Braga
60 cms
 Viewed:  287 Time(s)

DSC01489.JPG



DSC01490.JPG
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 Viewed:  287 Time(s)

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Matt_Zukowski
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PostPosted: Nov 18, 2017 16:01    Post subject: Re: Heavy rock identify help  

It looks like some sort of cryptocrystalline quartz, but you don't really know unless you do some tests. You can find information about tests you might do here: "What is this? / Where is it from?"

I think the things people would most like to know to help you are:

1) Does it fizz? Carbonate rocks fizz when you put a dilute acid on them as the reaction of an acid with a carbonate produces CO2 gas. Dilute (10%) hydrochloric acid works best for a fizz test but even a weaker acid like vinegar can work - for vinegar it is best if you grind up the rock into a powder and put vinegar, especially heated vinegar, on the powder.

2) How hard is it? Minerals differ in their hardness so knowing what the hardness is a of particular specimen can help identify it. Look at the link cited above for info on hardness testing but basically you try to scratch your unknown with things of various hardness - things that scratch the unknown are harder than the unknown and things that are less hard than the unknown are scratched *by* the unknown.

3) What kind of cleavage does it have? With something like this i would like to break it open to see how it fractures. Fracture patterns can have some diagnostic value.
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