Read previous Article : [intrusive igneous rocks types and pictures](https://steemit.com/nature/@ebugreat/intrusive-igneous-rocks-types-and-pictures)


1 **Agglomerate**
Agglomerate is made up of rounded lumps of other igneous rocks.

http://www.axeleratio.com/ip/travel/preserves/img/SibleyRocks/LapilliAgglomerate.jpg

2 **Pumice**
Pumice is full of gas bubbles and is very light. It will float on water.

http://www.sandatlas.org/wp-content/uploads/01009-Pumice.jpg

3 **Rhyolite**
Rhyolite is fine-grained. It contains quartz and feldspar.

http://geology.com/rocks/pictures/rhyolite-380.jpg

4 **Obsidian**
Obsidian has a smooth surface. It splinters easily, forming sharp edges.

http://lh3.googleusercontent.com/-cEAPVVlYUQ4/USkeJ2fbyTI/AAAAAAAAIR4/MV0FonTriLA/s720/00607%252520IMG_8329%25252011%252520cm%252520obsidian.jpg

5 **Basalt**
Basalt is the most common lava rock. It forms when lava cools quickly and fine-grained.

http://geology.com/rocks/pictures/basalt-380.jpg

6 **Tuff**
Tuff is formed from hardened volcanic ash.

http://lh3.googleusercontent.com/-bobiPC7qRcU/URJ3PZqw9FI/AAAAAAAAIgE/m74XZPeKrnA/s720/00501%252520IMG_8099%2525205%252520cm%252520crystal%252520tuff.jpg


To be Continued....Watch out for my next article  "Introduction To Sedimentary Rocks"

Read previous Article :  [intrusive igneous rocks types and pictures](https://steemit.com/nature/@ebugreat/intrusive-igneous-rocks-types-and-pictures)

IMAGE CREDIT:  [1](http://www.axeleratio.com/ip/travel/preserves/img/SibleyRocks/LapilliAgglomerate.jpg), [2](http://geology.com), [3](http://www.sandatlas.org)

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