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Let's Rock => Rough and Slabs => Topic started by: finegemdesigns on October 25, 2017, 08:20:27 PM

Title: Strange white chalky material with steel wires on Sonora Sunrise
Post by: finegemdesigns on October 25, 2017, 08:20:27 PM

Anyone want to help me identify what this is? It looks like leftover explosive residue from blasting. I broke off a tiny piece and heated with a flame but it didn't react.

(http://www.zbestvalue.com/images25/IMG_70022.jpg)

(http://www.zbestvalue.com/images25/whitewithwires.jpg)

The wires are steel or iron and attract a magnet.

Title: Re: Strange white chalky material with steel wires on Sonora Sunrise
Post by: Slabbercabber on October 26, 2017, 06:15:53 AM

Looks like the stone was mined from under a previous construction site.  If it is reinforced concrete acid will react with it very readily.

Title: Re: Strange white chalky material with steel wires on Sonora Sunrise
Post by: kenny on October 26, 2017, 09:08:50 AM

I think Slabbercabber is on the right track, but I think it is shotcrete yes a reinforced concrete that is spayed on the walls in a working mine usrd to controll unstable ground . Shotcreet is full of steel shards for reinforcement.
https://www.quora.com/What-is-shotcrete-in-mining

Title: Re: Strange white chalky material with steel wires on Sonora Sunrise
Post by: irockhound on October 26, 2017, 11:33:54 AM

I think some person who made a lovely garden wall out of local stones is missing a section today.

Title: Re: Strange white chalky material with steel wires on Sonora Sunrise
Post by: edgarscale on October 26, 2017, 06:52:59 PM

nice looking stone, very unqiue.