Sparkling black smooth rock

by Zac price
(Ohio)

If anyone knows what this is please let me know

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Nov 04, 2020
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Obsidian maybe.
by: Douglas

Zac,

This looks like obsidian. Where was it found? Obsidian is volcanic.

To identify this rock, or any rock, you need a few clues besides the color.
1. Where did the rock come from? If you know this you can look at a geology map to see what kinds of rocks are found there. Geology maps are easy to find- just google geology map + state.
Reading a geo map is a little more involved but only because they have so much information. This will help you get started:

https://www.rocksandminerals4u.com/geology-maps.html

2. Do some simple tests. You can find out about mineral tests here:

https://www.rocksandminerals4u.com/properties_of_minerals.html

Scratch test for hardnes and streak test are 2 important ones.

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