non silicates - halogenides

Question 1

which halogenides might come up in the exam? (and thus you need to know)

Answer 1

flourite

Halite

Question 2

identify the following mineral:
habit:
- cubic 
colour:
- can vary but most commonly purple 
- no streak
lustre:
-vitreous 
hardness:
- 3/4 scratched by steel nail
clevage:
- can have 4 directions 
perfect

Answer 2

flourite

Question 3

what are the diagnostic properties of flourite (eg. how would you know its flourite?)

Answer 3

• four clevage directions

- purple colour - cubic crystal habit

Question 4

what property do all halogenides share?

Answer 4

cubic crystal habit

Question 5

identify the follwing mineral:
habit:
- cubic (when not massive)
colour:
- white, orange 
- white streak 
cleavage:
- three directions 
- all at 90 and perfect 
hardness

Answer 5

halite

Question 6

what are the diagnostic properties of halite?

Answer 6

• hardness only 1/2
• tastes like salt
• 3 perfect cleavage direction
• cubic habit