Mineral Identification
1. cleavage how a mineral appears to reflect light 2. luster the true color of a mineral in powdered form 3. streak how a crystal breaks or splits when stressed
2. how a mineral appears to reflect light 3. the true color of a mineral in powdered form 1. how a crystal breaks or splits when stressed
Color is _____.
caused by the chemicals in a mineral
Pink quartz and smoky quartz are different colors. They will both have the same _____.
color streak
Dwayne has a green mineral. It most likely contains _____.
copper (Cu)
Talc _____.
has a Mohs hardness of 1
cleavage
how a crystal breaks or splits when stressed
luster
how a mineral appears to reflect light
Jess scratches an unknown mineral with topaz, which has a Mohs hardness of 8. Topaz leaves a scratch on the unknown mineral. The unknown mineral _____.
is softer than topaz is softer than diamond
Caleb has an opaque, reflective mineral. It has a ______ luster.
metallic
Brian stresses a mineral. It breaks cleanly and evenly, leaving a smooth surface. The cleavage can be described as _____.
perfect
streak
the true color of a mineral in powdered form
What do you use to correctly identify a mineral?
Use at least 5 different properties to ensure the correct identification
1. way light reflects from a mineral 2. way a mineral breaks under stress 3. reveals true, natural color of a mineral 4. least reliable property for identification 5. measured using the Mohs scale
1. luster 2. cleavage 3. streak 4. color 5. hardness