Help with rock identification.

Kuriositty

Newbie
Jun 2, 2017
1
0
Alberta
Primary Interest:
Other
Hello all,

I'm not new to rock collecting, but have no knowledge about indentifying rocks.


These few black rocks are extremely hard. I couldn't break them with a hammer. I tested them on concrete and the marks were white. All of them have this strange white rock crusted on the outside. In a certain light some parts are slightly shiny.
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These rocks to me look like they are rusty. Very dull looking rocks.
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I know these are very common, but I've never seen one this big. Is this a type of quartz?
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Is this a type of sandstone? I found it in a lake. It's very eroded, it crumbles very easily, even more so in water.
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I know this is a rock that has a lot going on. I do believe there is a little bit of quartz crystal in some of holes in the rock as well as the white stripe running through it.
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Any help would be appreciated. Thank you!
 

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