Metamorphic rocks are rocks that have become changed by intense heat or pressure while forming. One way to tell if a rock sample is metamorphic is
to see if the crystals within it are arranged in bands
. Examples of metamorphic rocks are marble, schist, gneiss, and slate.
What makes a rock metamorphic?
Metamorphic rocks form when
rocks are subjected to high heat, high pressure, hot mineral-rich fluids or
, more commonly, some combination of these factors. Conditions like these are found deep within the Earth or where tectonic plates meet.
What do metamorphic rocks look and feel like?
Metamorphic rocks were once igneous or sedimentary rocks, but have been changed (metamorphosed) as a result of intense heat and/or pressure within the Earth’s crust. They are crystalline and often have a
“squashed”
(foliated or banded) texture.
Which characteristics are used to identify types of metamorphic rocks?
As with igneous and sedimentary rocks, metamorphic rocks are classified on the basis of
texture (grain size, shape, orientation) and mineral composition
.
What are the 3 characteristics of metamorphic rocks?
- Classified by texture and composition.
- Rarely has fossils.
- May react with acid.
- May have alternate bands of light and dark minerals.
- May be composed of only one mineral, ex. marble & quartzite.
- May have layers of visible crystals.
- Usually made of mineral crystals of different sizes.
- Rarely has pores or openings.
What is the texture of a metamorphic rock?
TEXTURES Textures of metamorphic rocks fall into two broad groups,
FOLIATED and NON-FOLIATED
. Foliation is produced in a rock by the parallel alignment of platy minerals (e.g., muscovite, biotite, chlorite), needle-like minerals (e.g., hornblende), or tabular minerals (e.g., feldspars).
How do you identify rocks?
- Look at it closely on all visible sides to see how it reflects light.
- Test its hardness.
- Identify its cleavage or fracture.
- Name its luster.
- Evaluate any other physical properties necessary to determine the mineral’s identity.
How do you classify metamorphic?
Metamorphic rocks are broadly classified as
foliated or non-foliated
. Non-foliated metamorphic rocks do not have aligned mineral crystals. Non-foliated rocks form when pressure is uniform, or near the surface where pressure is very low.
What characteristics of a metamorphic rock is determined primarily by its parent rock?
What characteristic of a metamorphic rock is determined primarily by its parent rock?
overall chemical composition
. The metamorphic rock texture in which mineral grains are arranged in planes or bands.
What two features characterize most metamorphic rocks?
What two features characterize most metamorphic rocks? or
alternating light and dark mineral bands
) are characteristic of most metamorphic rocks. What phenomena can cause metamorphism? convection, deep burial, and water-rock interactions all lead to metamorphism.
What are 5 facts about metamorphic rocks?
The word metamorphic literally means “changed form”.
Slate
, a metamorphic rock, can form from shale, clay or mudstone. The Taj Mahal in India is made entirely of different types of marble, a metamorphic rock. Serpentine is a type of metamorphic rock that originates as the igneous rock periodite.
Which is not a characteristic of metamorphic rocks?
I.
sedimentary rock
. … Which is NOT a characteristic of metamorphic rocks? They are formed by compression by overlying sediments.
What color is metamorphic rock?
It is usually gray in igneous rocks; gray, white, yellow, or red in sedimentary rocks; and
gray or white in metamorphic
rocks.
How can you tell if a metamorphic rock is non foliated?
A nonfoliated rock will have almost the opposite texture. The minerals will appear to be randomly oriented without obvious banding and have a granular appearance. Unlike a foliated rock,
there will be no layers
and they will not flake apart into thin layers when broken.
How can you tell igneous and metamorphic rocks apart?
1. Igneous rocks are formed when magma (or molten rocks) have cooled down and solidified. Sedimentary rocks are formed by the accumulation of other eroded substances, while Metamorphic rocks are
formed when rocks change their original shape and form due to intense heat or pressure
.
