granite is grey in color and has crystals of mica, quartz all embedded in it, giving it a shiny and silver appearance
lead
It's called the minerals streak
gray and orange will make an ugly muddy color
Brown
You don't really measure luster, rather it is a yes or no answer. And in this case Aluminum does have luster.
gray
it leaves a prodominite steel gray always always always
Hematite can appear gray in color, but will exhibit a reddish to rust-colored streak.
A streak of graphite is the mark left on a surface when graphite is rubbed across it. It is typically a shiny, metallic gray color. Graphite's streak is often used as a diagnostic property to help identify minerals.
Nickel leaves a silver-gray streak. Note that nickel is an element.
Could be: Chalcocite, Galena, Molybdenite, Stibnite, or Jamesonite.
the streak color is colorless, gray
it can be white or gray but the word is STREAK
Gray
What is a whitish gray stones that leaves a colorless streak behind and is nonmitallic
WA411P for techno gray metallic
Galena's streak is gray, hematite's streak is deep maroon/brown.
it can be white or gray but the word is STREAK