First 24h of hunting. Please help me to identify object.

Hi.

I'm new to MD hobby. I bought my first metal detector yesterday. I decided to go with HF 9 function metal detector as it had quite good reviews and is affordable.
I didn't want to buy expensive detector since I don't know if I'm into MD yet.

So I started to practice in my backyard. I wasn't sure if I will be able to find anything, but I found too much. My detector beeps almost everywhere.
I started to dig. Found around 50 nails. Ok, that's not fun. I started to play with discrimination and it turned out that this detector discriminates iron quite well.
Detector no longer beeps everywhere I go. After 30 minutes and 5 holes later I found something that I can't identify.

I thought it was a water valve first, but it's a bit too irregular in shape. It was whole black at first so I started to clean it(used toilet cleaners). The black stuff became red after using Lysol. Lots of bubbles and it started to reveal some color.

Is this some king of ore? Copper? Melted brass?
How do I perform identification? Any DIY testing methods?  

Thanks for looking.

Kris.

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It's rather heavy. It's too heavy for aluminum in my opinion. And it's yellow. My first guess was brass, but I don't know how to test it.
It was covered with a thin black layer. And it turned red when I put some chemicals on it. My guess is that it was copper oxide that was removed by chemicals leaving pure red copper on top. I don't know how to test further the yellow metal inside. Here's one more picture after more cleaning was done.



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Hi K,
I have found similar stuff like that in the London area in England, they are the remains of German incendiary bombs that were mostly Aluminum that missed their target and burnt out in parks or open land.
You do not say where you come from so that theory may work if you live in an area that has WW2 connections.....HH,,,,,Johnnn

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