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Gold rock
  
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matt1980




Joined: 12 Nov 2020
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PostPosted: Nov 13, 2020 08:50    Post subject: Gold rock  

Its metallic, it scratches glass, the color is just gold. I dont know where its from, my Grandpa had it. He lived in VA.
I considered it might be coated with something, but it doesnt scratch off. Thanks!



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SteveB




Joined: 12 Oct 2015
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PostPosted: Nov 13, 2020 09:01    Post subject: Re: gold rock  

Might be a pyrite or a chunk of metal waste. You need to read the sticky topic which highlights some basic tests you need to make and provide the results with your post. It is difficult at best to identify a mineral from a photo alone.
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alfredo
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PostPosted: Nov 13, 2020 10:22    Post subject: Re: gold rock  

By the information Matt has given us (metallic luster, "gold" (or rather more pale brassy in the photo), and hardness over 5.5), this is most likely PYRITE (also known as "iron pyrites", "fools' gold", etc).
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matt1980




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PostPosted: Nov 13, 2020 10:52    Post subject: Re: gold rock  

I read the rules. I dont carry hydrochloric acid and a graduated cylinder in my back pocket.
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matt1980




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PostPosted: Nov 13, 2020 10:52    Post subject: Re: gold rock  

Alfredo, thank you.
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Riccardo Modanesi




Joined: 07 Nov 2011
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PostPosted: Nov 13, 2020 12:31    Post subject: Re: gold rock  

Hi to everybody! I agree: pyrite or chalcopyrite if the colour trends to gold-yellow and there are bluish-green streaks of oxydation.
Greetings by Riccardo.

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Hi! I'm a collector of minerals since 1973 and a gemmologist. On Summer I always visit mines and quarries all over Europe looking for minerals! Ok, there is time to tell you much much more! Greetings from Italy by Riccardo.
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