Question

What mineral leaves a green-black powder when rubbed against an unglazed porcelain plate?

Answer 1

it’s pyrite. it leaves green and black streaks :)

Answer 2

Answer:pyrite

Explanation: The Streak Test: Marks, known as "streaks," are produced by scraping mineral specimens across unglazed porcelain plates. On the left, a specimen of pyrite has produced a black streak.