2.2 Minerals are basic building blocks of Earth. A mineral is identified by its properties. A mineral’s appearance helps identify it. Identify a mineral by it’s properties (characteristic features) color minerals can occur in more than one color
A mineral is identified by its properties.
A mineral’s color may change when the mineral is in contact with the atmosphere or water.
Minerals may get their color from small amounts of another element.
The crystals of a mineral can have defects that may change their color.
A. Streak is the color of the mineral powder left behind when a mineral is scraped across a surface.
A. Luster describes the way in which light reflects from the surface.
Q. Why can the way a mineral breaks help identify it?
A. Each kind of mineral always breaks in the same way, making it a better identifier than luster or color.
A. The bonds between the atoms of the minerals are of fairly equal strength in all directions, so there is no particular direction of weakness.
A. Quartz; It has a higher value on the Mohs scale
a mineral’s resistance to being scratched
determined in part by crystal structure
determined in part by the strength of the bonds between the atoms
often described using the Mohs scale of hardness