A characteristic useful in identifying an unknown mineral is the color of the powder that is produced when the mineral is scraped across a piece of unglazed porcelain.
(A characteristic useful in identifying an unknown mineral; is; the color of the powder) (the powder; is produced; T:when the mineral is scraped across a piece of unglazed porcelain) (the mineral; is scraped; L:across a piece of unglazed porcelain)
A characteristic useful in identifying an unknown mineral the powder the mineral
is is produced is scraped
the color of the powder
T:when the mineral is scraped across a piece of unglazed porcelain
L:across a piece of unglazed porcelain