Streak -- is the color of the powder from the mineral on a porcelain plate (streak plate)-- --since most minerals are softer than porcelain (8 hardness on Moh's Scale), their powder will remain after scratching it on the streak plate V. Luster --is the general appearance of the surface of a mineral in reflected light--minerals can have a metallic luster if they are opaque to light, give a prominent dark or black streak, and are usually dense like galena, pyrite, and bornite or can have a non metallic luster if they are translucent or transparent to light and have a colorless or white streak --on occasion it is difficult to determine if a mineral is one or the other and may have a & 
(Streak; is; the color of the powder from the mineral on a porcelain plate) (they; are; translucent or transparent to light and have a colorless or white streak) (most minerals; are; softer than porcelain) (they; are; opaque to light) (minerals; give; a prominent dark or black streak) (minerals; are; T:usually; dense like galena, pyrite, and bornite)
Streak they most minerals they minerals minerals
is are are are give are
the color of the powder from the mineral on a porcelain plate
translucent or transparent to light and have a colorless or white streak
softer than porcelain
opaque to light
a prominent dark or black streak
T:usually dense like galena, pyrite, and bornite