Rocks Classification Key Vocabulary

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Last updated 3:02 PM on 6/6/26
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24 Terms

1
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minerals

solid pieces that make up rocks

<p>solid pieces that make up rocks</p>
2
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ribbons or "bands"

thin layers that look like stripes on a rock

<p>thin layers that look like stripes on a rock</p>
3
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layers

one part on top of another

<p>one part on top of another</p>
4
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fossils

remains of plants or animals. can be found in sedimentary rock.

<p>remains of plants or animals. can be found in sedimentary rock.</p>
5
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grains

really tiny pieces of rock

<p>really tiny pieces of rock</p>
6
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pebbles or gravel

small rocks

<p>small rocks</p>
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crystals

sparkly minerals in a rock

<p>sparkly minerals in a rock</p>
8
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streak

the color of a mineral, when you draw a line with it.

<p>the color of a mineral, when you draw a line with it.</p>
9
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luster

the way a mineral reflects light - how "shiny" it is.

<p>the way a mineral reflects light - how "shiny" it is.</p>
10
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glassy

when the outside of a rock looks like glass or a mirror.

<p>when the outside of a rock looks like glass or a mirror.</p>
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sediment

broken down pieces of rock

<p>broken down pieces of rock</p>
12
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colorless

no color

<p>no color</p>
13
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compact (compacting, compaction, compacted)

to squeeze together

<p>to squeeze together</p>
14
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cement (cementing, cementation, cemented)

to press or glue together

<p>to press or glue together</p>
15
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metallic luster

when a mineral looks like metal, shiny

<p>when a mineral looks like metal, shiny</p>
16
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nonmetallic luster

when a mineral does NOT reflect light like a metal. Not shiny

<p>when a mineral does NOT reflect light like a metal. Not shiny</p>
17
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structure

something that you build or put together

<p>something that you build or put together</p>
18
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sedimentary rock

a type of rock that forms when sediment is compacted and cemented over time.

<p>a type of rock that forms when sediment is compacted and cemented over time.</p>
19
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metamorphic rock

a type of rock that forms when heat and pressure change another rock

<p>a type of rock that forms when heat and pressure change another rock</p>
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igneous rock

a type of rock that forms when melted rock cools and hardens.

<p>a type of rock that forms when melted rock cools and hardens.</p>
21
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magma

melted rock (also called lava)

<p>melted rock (also called lava)</p>
22
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sandstone, limestone, shale

examples of sedimentary rocks

<p>examples of sedimentary rocks</p>
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marble, slate, gneiss

examples of metamorphic rock

<p>examples of metamorphic rock</p>
24
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granite, obsidian, pumice, scoria

examples of igneous rocks

<p>examples of igneous rocks</p>