The characteristics of an object that can be observed or measured.
is not usually a reliable indicator of minerals identity
can come from a variety of colors
Changes in color
can be caused by weather and impurities
the way a mineral reflects light from its surface
Luster of minerals
they have metallic or non-metallic luster
the color of a mineral in powdered form
is more reliable in identifying minerals and is not always the same color as the outside
when you rub a mineral across a ceramic plate or unglazed porcelain and it leaves a streak
is when mineral breaks unevenly along a curved or irregular surface.
How a mineral breaks...
is determined by the arrangement of the atoms
the tendency of a mineral to break along flat surfaces
refers to a minerals resistance to being scratched
Mohs' Hardness Scale
A scale ranking ten minerals from softest to hardest; used in testing the hardness of minerals.
the amount of matter in a given space. Mass per unit of volume. Measured in g/cm3
=1g/cm3 and is used as a reference point for other substances. EX: Gold=19g/cm3 means there is 19 times more matter in 1cm3 of gold than 1cm3 of water
ability to glow under ultraviolet light
process that changes one set of chemicals into another set of chemicals
will cause specific visual changes in other materials
a kind of sensing
attraction for iron, the force around a magnet
The process in which some substances spontaneously emit radiation