[Rockhounds] Re: streak plate (was) Darwin, CA Pyrite RATED PG-13

[Kitty & Bill Heacox]

Just a note for those who don't have a streak plate:  use the underside 
of the tank lid on your toilet, provided it is ceramic (I'm talking 
about the tank cover, not the seat lid).

Aloha, Kitty

Carolyn Reynard wrote:
> A streak test will give you the color of the mineral in powdered form.
> Firmly rub the mineral on an unglazed piece of tile.