The metamorphics rocks of the Sòl-de-Riu High School lab.

1. •Cristian Galván Izquierdo
•Íker Gil Fabregat
•Llàtzer Miguel Valdès
THE METAMORPHIC
ROCKS

2. ÍNDEX
●What are the metamorphics rocks?
●What are the regional and contact metamorphism?
●Which are the metamorphics rocks?
●Exemples: Slate, Gneiss, Schist, Marble, Micasquist, Quartzite, Micacita

3. WHAT ARE THE METAMORPHIC
ROCKS?The metamorphic rocks are
subjected to metamorphism.
Metamorphism is the set of solid
state reactions affecting a rock (of
any kind be sedimentary, igneous or
metamorphic) subject to conditions of
pressure and different to its origin
temperature.

4. WHAT ARE THE REGIONAL AND
CONTACT METAMORPHISM?
Contact metamorphism is a type of metamorphism in which the change occurs
in the rocks by the heat they receive when they are near a magma intrusion.
Regional metamorphism is a type of metamorphism in which the change
occurs in conditions of high pressure and sometimes high temperatures.

5. WHICH ARE THE
METAMORPHIC ROCKS?

6. SLATE (pissarra)
It’s formed from metamorphisme of mudstone
(argila)
Colour: Black
Fracture: Thin flat layers
Texture: Granular fine and homogeneous
Composition: Crystals not observable to
the naked eye

7. GNEISS
It’s a foliated rock with a banded appearance and
granulars mineral grains. It’s formed from granit or
clays. It has wavy layers, because of the grains of
granit.
Colour: Dark and light stripes
Fracture: Strips
Texture: Planar rude
Composition: Quartz, feldspar and mica.

8. MICASQUIST
Colour: Gray tones
Fracture: sheet
Texture: Schistose lepidoblastic
Composition: Mica, quartz and other
minerals.

9. SCHIST
Colour: Fairly homogeneous
Fracture: A wavy and irregular structure
sheet (schistose structure)
Texture: Flaky
Composition: Muscovite, biotite, chlorite,
quartz, plagioclase and chloritoid,
staurolite, andalusite, kyanite, garnet,
sillimanite

10. MARBLE
It’s formed by metamorphisme of calcareous, so it
reacts with hydrochloric acid, and it makes
effervescence.
Colour: white, pink, green, … it depends
on the impurities.
Fracture: not foliated
Texture: fine to coarse grained,.
Composition: CaCO3, mica, magnesium
silicates, graphite, iron oxides

11. QUARTZITE
It’s formed by metamorphisme of sandstone.
Colour: usually white to gray
Fracture: conchoidal fracture
Texture: coarse texture
Composition: almost entirely of quartz

12. MICA SCHIST (MICACITA)
Colour: green, grey, dark brown.
Fracture: medium grained.
Texture: foliated, platy.
Composition: quartz and mica (biotite or
muscovite)