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Identity HelpCurious Rock/Mineral.

16th May 2018 23:29 UTCRobert Darabos

02909080016052281549537.jpg
Curious rock/mineral I found today in Michigan.

It is actually garden rock here marketed as Western Sunrise Rock (something like that).

So potentially actually comes from the Western United States.


Does not scratch with a steel knife and no reaction to acid. Also does not appear to be translucent at all.


I was thinking either a.) Jasper b.) a random pretty metamorphic rock or c.) something else


Thoughts?

08441080015652189862430.jpg

04156150015652189871462.jpg

16th May 2018 23:30 UTCRobert Darabos

09197510016052281541125.jpg
And some close ups.

08739080015652189877419.jpg

04425140015652189884366.jpg

17th May 2018 01:34 UTCRobert Darabos

Just did a specific gravity test with some varying results.

Ranged from 2.05 - 2.8

Three different pieces.


Piezoelectric test looks like it sparks a little.

I MAY e hitting the anvil on the bottom. But maybe not. Hard to tell.

17th May 2018 02:05 UTCReiner Mielke Expert

Looks like some sort of slag to me.

17th May 2018 03:23 UTCGregg Little 🌟

I looked at a number of landscape supplies and one actually called it granite ????. The aggregate might be a mixture of real and fake (slag?) material. The colourful stuff may be the slag like your piece which has odd looking cavities.

17th May 2018 04:52 UTCRobert Darabos

I considered slag at first too but wasn't sure.

Is slag that hard?

17th May 2018 07:58 UTCLukáš Křesina

It looks like the rock called porcellanite. It is a clay fired on the contact with volcanic rocks or burning coal deposits.

Lukáš Křesina

17th May 2018 17:02 UTCRichard Gibson 🌟

Agreed with Lukáš - porcellanite, also known as clinker. Very abundant in Wyoming where it is used as road metal as well as "garden rock."
 
Mineral and/or Locality  
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