Rocks

What is this?

Granite and it’s coarse grained, primarily composed of quartz, feldspar, and mica minerals.

What is this?

It is gabbro. And it’s a dark-colored, coarse-grained rock composed mainly of pyroxene, plagioclase, and olivine minerals.

What is this?

Basalt. A Fine-grained, dark-colored rock formed from rapidly cooled lava; rich in iron and magnesium

What is this?

Obsidian and it is made of volcanic glass; smooth, shiny, and usually black; forms from rapidly cooled lava

What is this?

This is pumice. Light-colored, porous rock with many gas bubbles; often floats on water; formed from frothy lava.

What is this?

Scoria. Dark-colored, vesicular (contains gas bubbles) rock; forms from lava with high gas content.

What is this?

Breccia. Coarse-grained rock composed of angular fragments; cemented together.

What is this?

Conglomerate. Coarse-grained rock made of rounded pebbles and gravel; cemented together.

What is this?

Sandstone. Medium to coarse-grained rock composed of sand-sized grains; often forms in deserts or underwater.

What is this?

Siltstone. Fine-grained rock composed of silt-sized particles; smooth texture.

What is this?

Shale. Fine-grained, layered rock composed of clay minerals; breaks into thin sheets.

What is this?

Limestone. Sedimentary rock composed of calcium carbonate; often contains fossils; reacts with acids.

What is this?

Rock salt. Forms from the evaporation of salty water; composed of halite crystals

What is this?

Coal. Organic sedimentary rock formed from plant remains; varies in hardness and carbon content.

What is this?

Bituminous Coal

What is this?

Anthracite coal

What is this?

Gneiss

What is this?

Phyllite

What is this?

Schist

What is this?

Slate

What is this?

Marble

What is this?

Quartzite

What is this?

Diorite

What is this?

Pyrite