|
MINERAL
|
COLOR
|
STREAK
|
HARDNESS
|
|
Biotite (Mica)
|
green to black
|
uncolored
|
2 1/2-3
|
|
Calcite
|
white, grey, red, green
|
white or
|
|
|
blue, violet
|
greyish
|
3
|
|
Chalcopyrite
|
brass yellow
|
greenish black
|
3 1/2-4
|
|
Feldspar
|
white, bluish, grayish
|
uncolored
|
6
|
|
Fluoride
|
white, green, yellow
|
white
|
4
|
|
|
blue, violet, red
|
|
Galena
|
lead-gray
|
lead-gray
|
2 1/2
|
|
Graphite
|
iron black to dark
|
steel-gray
|
1-2
|
|
|
steel gray
|
|
Gypsum
|
usually white
|
white
|
1 1/2-2
|
|
Halite
|
colorless or white
|
white
|
5 1/2-6 1/2
|
|
Hematite
|
steel gray, red, brown
|
reddish brown
|
5 1/2-6 1/2
|
|
Hornblende
|
dark green to black
|
uncolored
|
5-6
|
|
Magnetite
|
iron-black
|
black
|
5 1/2-6 1/2
|
|
Pyrite
|
pale brass-yellow
|
greenish black
|
6-6 1/2
|
Quartz
|
Rock crystal
|
colorless
|
uncolored
|
7
|
|
Amethyst
|
purple
|
uncolored
|
7
|
|
Smoky
|
smoky, black
|
uncolored
|
7
|
|
Rose
|
pink
|
uncolored
|
7
|
|
Agate
|
several colored, banded
|
uncolored
|
7
|
|
Jasper
|
red, brown, green
|
uncolored
|
7
|
|
Chalcedony
|
tan, white, blue
|
uncolored
|
7
|
|
Flint
|
gray, brown, black
|
uncolored
|
7
|
|
Sulfur
|
sulfur-yellow,
|
white
|
1 1/2-2 1/2
|
|
|
honey-yellow
|
|
Talc
|
apple-green to white
|
usually white
|
1-1 1/2
|
ACID RAIN
This would be a good time to discuss how acid rain effects buildings and statues. Since acid rainfall sometimes can be the strength of pure vinegar, students can actually see the cumulative effect of it on limestone buildings, marble statues, etc.
On a rainy day, have the class collect a sample of rainwater. Try soaking chalk in it for several days to see if it has an effect on it.
(figure available in print form)
I would put this chart on the board and have students talk about it (acid rain). Another project would be a research paper for two or more of your best students to work on for a report to be read to the class.
