This stuff looks like popcorn shipping foam, small little pellets of Styrofoam type material, I have never seen this before (house built in 1940) Anybody ever seen this before in the attic ?
Looks like PERLITE.
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They still using that Scott?
Expanded perlite, not the crushed stuff.
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Expanded Perlite.
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tastes like chicken,
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Don’t know, Sir Roy,
The “other” white insulation, but I have to agree with @mcyr…
You can read up on it here;
https://www.perlite.org/insulation/#:~:text=Perlite%20insulation%20is%20an%20inorganic,pizza%20ovens%20and%20rocket%20stoves.
about 2.7 per inch
Perlite , including perlite building Insulation is a non-fibrous non-asbestos-containing material which has an R - value of about 2.7 per inch and would not be expected to contain asbestos.
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We used to dump that stuff into block walls that didn’t have grouted cells for insulation. It’s super light and mimics styrofoam beads. If the wind was blowing it made a mess. LOL.
I think you are on point again Marcel. 
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What, you didn’t believe it when I said it?
BLAH BLAH BLAH.
I didn’t think we had to write a novel on every post they should be smart enough to look it up themselves. 
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That’s downright funny, if you’ve been reading here for any length of time.
Ok Dominic, GREAT JOB!!! Cudos to you too. 
No offense but Marcel just kinda one uped you with a link that’s all.
Well a CMI made the OP
My comment was tongue-in- cheek, but apparently it ruffled some readers feathers…so clearly I was off the mark.
Come on, Dom! 
Good point!