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3. Reading comprehension

3.1 Scanning: Earth’s building blocks (r.P – 4.2)

3.1.1 Pay attention to the pronunciation of the following minerals:

Which minerals have the same translation in both languages and which do not?

hematite

magnetite

dolomite

halide

mica

fluorite

feldspar

halite

carbonate

hydroxide

quartz

limonite

asbestos

brucite

calcite

sulfate

aragonite

gypsum

galena

phosphate

silicate

apatite

oxide

monazite

sulfide

tungstate

pyrite

wolframite

3.1.2 Find the information you need to complete the following diagram from the text below.

ROCK-FORMING MINERALS

mineral

abundance

composition

examples

Rocks are mixtures of minerals. Most rocks consist of interlocking crystals or grains stuck together by natural cement. A few dozen minerals provide the main ingredients for the most common rocks. Here are brief details of some rock-forming minerals.

  1. Silicates are the chief rock-forming minerals. Most features a metal combined with silicon and oxygen. Examples: asbestos, mica, and feldspar.

  2. Carbonates, the second most abundant group of minerals, include carbon, oxygen and one or more metals. Examples: calcite, dolomite and aragonite.

  3. Sulfides are compounds of sulfur and one or more metals. Examples: galena and pyrite.

  4. Oxides are compounds of oxygen and one or more metals. Examples: quartz, hematite and magnetite.

  5. Halides are compounds of a halogen and a metal. Examples: fluorite and halite (rock salt).

  6. Hydroxides are compounds of hydrogen, oxygen and usually a metal. Examples: limonite and brucite.

  7. Sulfates are compounds of sulfur, oxygen and a metal. The commonest sulfate is gypsum.

  8. Phosphates are chemical compounds related to phosphoric acid. Examples: apatite, monazite.

  9. Tungstates are salts of tungstic acid. Example: wolframite (a tungsten ore).

(Lambert “The Field Guide to Geology” 1988, Cambridge University Press)

CHEMICAL class

MINERAL NAME

CHEMICAL FORMULA

NATIVE ELEMENTS

Native copper

Cu

Gold

Au

Sulfur

S

Graphite

C

Diamond

C

OXIDES and HYDROXIDES

Quartz

SiO2

Hematite

Fe2O3

Magnetite

Fe3O4

Corundum

A12O3

SULFIDES

Pyrite

FeS2

Chalcopyrite

CuFeS2

Galena

PbS

SULFATES

Gypsum

CaSO4 2H2O

Anhydrite

CaSO4

CARBONATES

Calcite

CaCO3

Dolomite

CaMg(CO3)2

PHOSPHATES

Apatite

Ca5(PO4)3(F, Cl, OH)

HALIDES

Halite

NaCl

Fluorite

CaF2

SILICATES

OLIVINE GROUP

Olivine

(Mg, Fe)2[SiO]4

AMPHIBOLE GROUP

Hornblende

Ca, Na, Mg, Fe, Al silicate

PYROXENE GROUP

Augite

Ca, Mg, Fe, Al silicate

MICA GROUP

Muscovite

K, Al silicate

Biotite

K, Mg, Fe, Al silicate

Chlorite

Mg, Fe, Al silicate

Talc

Mg silicate

Kaolinite

Al silicate

FELDSPAR GROUP

Orthoclase (K-feldspar)

K[AlSi3O8]

Plagioclase (Ab, An)

Mixture of Ab and An

Albite (Ab)

Na[AlSi3O8]

Anorthite (An)

Ca[Al2Si2O8]

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