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You may be thinking of unglazed porcelain, used in streak tests? The reason I'm not sure is that different minerals leave different color streaks. After all, it's not much of a test if there's never any difference in the results: "Let's try the gravity test... yep, falls down; you know, I'm starting to think that maybe this test is a waste of time."
What else can I help you with?
What is the birth name of Brown Mark?
Brown Mark's birth name is Mark Brown.
When was Mark A. Brown born?
Mark A. Brown was born on 1961-02-10.
When was Mark E. Brown born?
Mark E. Brown was born in 1962.
When was Mark Brown - cricketer - born?
Mark Brown - cricketer - was born in 1958.
When was Leave a Mark created?
Leave a Mark was created on 1998-05-05.
How old is mark brown?
My name is Mark Brown I was born 12/10/1959
What has the author Mark Douglas Brown written?
Mark Douglas Brown has written: 'Capone'
What minerals is soft enough to leave streaks on paper?
The mineral graphite is soft enough to leave a mark on paper. We use graphite, which is a form of carbon, as pencil lead. And it works pretty darn well at leaving marks on paper.
How do you sayyou will leave a mark in french?
You will leave a mark Vous laissera une marque
When was Mark Brown - golfer - born?
Mark Brown - golfer - was born on 1975-02-09.
When was Mark N. Brown born?
Mark N. Brown was born on 1951-11-18.
When was Mark Brown - baseball - born?
Mark Brown - baseball - was born on 1959-07-13.
