hardness, luster, cleavage and fracture, color (not quite useful) and streak
Would it be their physical and chemical properties.
Purely a guess: its site of origin.
Hardness
mineral content
Mineral content
Pennsylvania's most important mineral is coal. Second is oil.
The bone mineral. The most abundant mineral in the body
A mineral is substance that is formed naturally in the Earth. The most common types of mineral are Quartz and Feldspar. A mineral that is in liquid or gas form is not a mineral until it becomes a solid.
Color, due to the effects of impurities, is the least reliable identifying mineral characteristic.
Mineralogists often use the physical properties of minerals to identify them. The most reliable test in order to identify a mineral is the test for hardness.
what is the most reliable way to identify a mineral?
While Minerals may share apparent colours, most do not share both colour and hardness, as well as the fact that the colour can be more accurately identified from the mineral's powder.
mineral content
C. density. Just googling the questions again? You should pay more attention in class, or just read the book you're getting these questions from for once...
HARDNESS
Take a slate and slide the mineral/rock on it to find its true color and its streak.
A mineral specimen's color can be affected by radiation or impurities. A better method would be to use the mineral's streak, the color of the mineral in powdered form.
Mineral content
Because they look alike
The least effective property used to identify most minerals would be the color. The color of a mineral can be altered by impurities.