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Black mica?

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N_Cook

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Nov 3, 2016, 12:41:15 PM11/3/16
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Anyone ever seen this before? Basically clear mica but with black smokey
looking intrusions, something geological in the way of tar/bitumen
leeching into the cleaving planes?

Cursitor Doom

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Nov 3, 2016, 1:23:20 PM11/3/16
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Intrusions or *inclusions* do you mean?

N_Cook

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Nov 3, 2016, 5:35:24 PM11/3/16
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I'm no geologist, not erratics anyway.
Randomly distributed swirls like colours in marble, but smokey black colour

whit3rd

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Nov 3, 2016, 9:15:53 PM11/3/16
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Sure; Amelia County, VA has some old mica mines, the native stuff is near black
(but that's 0.3 inch thick, and it's prepared by cleaving down to 0.003"
thickness).

Michael Black

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Nov 3, 2016, 11:05:32 PM11/3/16
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So it's just availability? There's no special quality of black mica over
the regular stuff?

Michael

Look165

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Nov 4, 2016, 4:00:36 AM11/4/16
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....Just paint it black !

N_Cook a écrit :

N_Cook

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Nov 4, 2016, 4:06:29 AM11/4/16
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I don't suppose you happen to know whether the insulation property is
just the same? I'm thinking whether the black material may absorb water
vapour

pf...@aol.com

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Nov 4, 2016, 7:58:00 AM11/4/16
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Pretty much all questions answered right here:

https://en.wikipedia.org/wiki/Mica

Ontario seems to be one source of "Dark Mica".

Some types do absorb moisture, but, it is not as if they would be used for insulators.

The original "Glitter".

Peter Wieck
Melrose Park, PA
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