Coated With ??

[Cariboo5]

This almost cube shaped size 11.78mm x 12.0mm has a shiny sheen silver-grey color over what looks to be a reddish host.
Any and all thoughts welcome to what it could be...Thanks in advance to all...

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[waxy luster]

Desert Varnish, or if you prefer, Patina.

Clay, Dew, Manganese, Iron and Arid Environment all combine and work their magic over time to coat some stones various shades.


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[DDancer]

Might be a piece of weathered Arsenopyrite. Kinda small but you could try a scratch test and sniff the result. Arsenopyrite is said to put out a sulfur smell when struck and scratching is pretty much the same thing.