Magnetite
Y
Graphite
Streak test because minerals can vary in color, size and shape but their streak color will always be the same for that specific mineral. Calcite comes in many shapes and colors, but its streak is always white.
azurite is one of the minerals that has a light blue streak.
Magnatite is the mineral that has a nonmatallic luster, is black, and can be scratched by a fingernail.
Graphite is black and posseses dull appearance
Magnetite can be black and it has a black streak. It is metallic and iron ore
Magnetite.Has metallic luster, silver color, black streak, and contains (Fe) Iron.
Graphite
Streak test because minerals can vary in color, size and shape but their streak color will always be the same for that specific mineral. Calcite comes in many shapes and colors, but its streak is always white.
Well you see, it's pretty simple. If a fingernail has a hardness of 2.5, and the question is asking what mineral can easily be scratched by a fingernail. Well then it is Graphite. It has a less hardness than your fingernails.
azurite is one of the minerals that has a light blue streak.
Magnatite is the mineral that has a nonmatallic luster, is black, and can be scratched by a fingernail.
Well you see, it's pretty simple. If a fingernail has a hardness of 2.5, and the question is asking what mineral can easily be scratched by a fingernail. Well then it is Graphite. It has a less hardness than your fingernails.
a black mineral can have a brown streak.
Graphite is black and posseses dull appearance
a black mineral can have a brown streak.
magnetite