non silicates- carbonates Flashcards
1
Q
identify the following carbonate: habit: - usually massive but isometric/cubic when fine grained colour: - colourless/white - white streak lustre: -vitreous/pearly cleavage: - three direction - perfect hardness: - 3/4 additional properties: - dissolves in HCL
A
dolomite
2
Q
what are the daignostic properties of dolomite?
A
- hardness 3/4
- perfect rhombahedral cleavage (three directions)
- dissolves in HCL
3
Q
which carbonates are you expected to know for the exam?
A
- dolomite
- calcite
- malachite
- azurite
- siderite
- aragonite
4
Q
identify the following carbonate: habit: - subhedral bladed/isometric crystals aggregation: - botryoidal colour: - green streak: - pale green streak lustre: -earthy/dull hardness: -1/2 cleavage: - has 2 when well formed additional proeprties: - dilutes in HCL
A
Malachite
5
Q
what are the diagnostic properties of a malachite specimine?
A
- hardness 1-2 (very doft compared to other green minerals)
- its very beautiful shade of green
- leaves a pale green streak (but beware chlorite does also)
- dilutes in hcl- spearates from other green streak minerals
6
Q
idnetify the following specimen: habit: - almost circular looking grains. isometric colour: -deep blue lustire: - ranges right from vitreous to dull hardness: - 3/4 cleavage: - can have two poorly formed directions additional properties: - dissolves in hcl
A
azurite
7
Q
azurite, kyanite, and sodalite are all blue minerals. how would you distinguish between the three?
A
- azurite will dissolve in HCL
- kyanite has three distinct cleavage directions
- sodalite has cleavage but commonly breaks in conchoidal fractures
8
Q
identify the following carbonate: habit: - blend of elongated and cubic crystals colour: -distinct organgey brownish colour lustre: -vitreous to pearly hardness: -3/4 cleavege: -h as one direction in theory
A
siderite
9
Q
what are the diagnostic properties of siderite?
A
- its colour and its dissolution in HCL
10
Q
identify the follwing carbonate mineral: habit: - has a VERY distinctive cubic habit when granular colour: -white/transparent hardness: - 3/4 cleavage: - perfect in three direction - ~ 80 degree angle additional properties: - dilutes in Hcl
A
calcite
11
Q
what are the diagnostic properties of calcite carbonate?
A
- dilutes in HCL
- three cleavage directions (none of the other carbonates have this)
12
Q
Dolomite and calcite have pretty much the SAME properties. How could you tell the two apart?
A
Dolomite has a much slower reaction with HCL, calcites is much more rapid
