Quiz #11 on minerals
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5 characteristics of minerals
• Solid • Inorganic • Naturally occurring • Crystal structure • Definite chemical composition
Naturally occurring
Formed in the natural world
Inorganic
Cannot form from materials once living/part of a living thing
Solid
Definite volume and shape
Crystal structure
Particles line up in a repeating pattern
Definite chemical composition
Always contains certain elements in set proportions
Uses of minerals
• Electronics • Jewelry • Source of metals
Mineral with the most commercial value
Quartz - found in glass and electronics
6 properties to identify a mineral
• Breakage • Color • Streak • Hardness • Density • Luster
Breakage
Cleavage (breaks on a flat plane) vs fracture (uneven break)
Color
Color of the mineral
Streak
Color of the mineral’s powder
Hardness
Mohs hardness scale - 1-10: what materials can scratch a mineral)
Density
grams/mL
Luster
Metallic or non-metallic
Most useful property
Hardness - more variation between different minerals but not for the same mineral
Least useful property
Streak - very similar for every mineral