Carbonates

Question 1

trigonal carbonate with 2 or more (double) cations

Answer 1

dolomite
CaMg(CO3)2

Question 2

monoclinic carbonates with OH present

Answer 2

malachite = CuCO3 * Cu(OH)2

azurite = 2CuCO3 * Cu(OH)2

Question 3

single cation carbonate minerals

trigonal

Answer 3

magnesite (Mg)
Siderite (Fe)
Smithsonite (Zn)
Rhodocrosite (Mn)
Calcite (Ca)

Question 4

single cation carbonate minerals

orthorhombic

Answer 4

Aragonite (Ca)
Strontionite (Sr)
Ceracite (Pb)
Witherite (Ba)

Question 5

composition of limestone

Answer 5

Calcite + Aragonite + shell fragments

Question 6

Where do you find gem-quality Rhodochrosite?

Answer 6

Colorado & Argentina

Question 7

carbonate general formula

Answer 7

CO3^2-

Question 8

carbonate polymorphs

Answer 8

calcite
siderite
magnesite

Question 9

total # over carbonate minerals

Answer 9

OVER 70, only a few are common

Question 10

Physical properties of carbonates

Answer 10

Lustre: vitreous
Hardness: 3-4.5
Density: 2-4
Colour: dolomite = buff / siderite = white,clear, when weathered dark brown
Shape: most carbonates have a rhomb shape except calcite
cleavages: 3 perfect
Chem property of effervescence (all react with concentrated HCl, ONLY calcite reacts with dilute HCl)

Question 11

major constituent of limestone

Answer 11

calcite

Question 12

siderite is an important ore of

Answer 12

iron ore

Question 13

Azurite and Malachite are minor ores of?

Answer 13

Copper