non silicates - halogenides Flashcards
1
Q
which halogenides might come up in the exam? (and thus you need to know)
A
flourite
Halite
2
Q
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
A
flourite
3
Q
what are the diagnostic properties of flourite (eg. how would you know its flourite?)
A
- four clevage directions
- purple colour - cubic crystal habit
4
Q
what property do all halogenides share?
A
cubic crystal habit
5
Q
identify the follwing mineral: habit: - cubic (when not massive) colour: - white, orange - white streak cleavage: - three directions - all at 90 and perfect hardness
A
halite
6
Q
what are the diagnostic properties of halite?
A
- hardness only 1/2
- tastes like salt
- 3 perfect cleavage direction
- cubic habit