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Minerals in ground
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Chet Bishop
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Joined: 23 Mar 2007
Posts: 678
Location: Forest Grove, Oregon

PostPosted: Tue Oct 27, 2015 9:08 pm    Post subject: Reply with quote

Obsidian is just volcanic glass-- if you want glass powder it is available off the floor at auto-glass shops, from grinding, and buffing the edges of windows.

One thing to keep in mind, once you are making tiny particles, is that ANY of those tiny particles can cause chronic lung problems...doesn't seem to matter what it is made of.

Roger Hargrave swears by the plaster dust, thoroughly hydrated, etc., but it is not for looks so much as sound.

I kind of liked the looks of what you did with the mica...I just don't know if it would still reflect in tiny particles.
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Mat Roop
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Joined: 24 Mar 2007
Posts: 911
Location: Wyoming Ontario

PostPosted: Wed Oct 28, 2015 12:50 am    Post subject: Reply with quote

If you are looking for some reflectivity.... Here is a thought.
Recently I bought a new white car with a color (white frost tricoat) that has some brilliance to it . The front bumper got a stone chip so I bought some matching touchup paint and it clearly contains some reflective particles... sort of like the sparkle you can buy in spray cans of glitter... not sure what the glitter is, but sure sparkles. Applied, it leaves a smooth surface.
FWIW... Cheers, Mat
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jethro
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Joined: 07 Apr 2007
Posts: 178

PostPosted: Sat Oct 08, 2016 4:52 am    Post subject: Reply with quote

Dave.....
dont give up so easy.....
i think your particles need to be much smaller.
a little ball mill would do it. I have seen little ones that just hold
about a pint.....plus either brass steel balls. Probably want stainless steel
balls. I would think you would want it to be in the micron or tens of micron
Size range to have a good optical effect.
all you need is a cylindrical glass jar and a way to turn it slowly.
once you hd that....you could try grinding many different minerals.
quartz,ruby,amethyst,pyrite......
i have picked up handfulls of rubys laying in shallow depressiond on the
rocks where the water washes them out. (In franklin north carolina)
You can probably find them there too.
how about calcite....it has some interesting optical properties........
Tim
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jethro
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Joined: 07 Apr 2007
Posts: 178

PostPosted: Sat Oct 08, 2016 8:21 pm    Post subject: Reply with quote

the auto paint stores have metal flake that goes into their paint---
I think they have at least 3 sizes.... but I suspect they would all be too large for this purpose. I don't know if its aluminum or mica or something else. Google if your friend (and mime)

Tim
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Dave Chandler
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Joined: 31 Oct 2007
Posts: 691
Location: Mt Mitchell in North Carolina

PostPosted: Sun Oct 09, 2016 1:09 pm    Post subject: Reply with quote

I may try the mica once more, grind with mortar and pestal, and then rub it into the surface along with glue size or sealer. It might not be any different than store bought mineral ground, like from oldwood. I'm about to varnish a cello, so I'm thinking efficiency of cost.
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