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Tufa- A porous limestone that forms from the precipitation of calcium carbonate, often at a hot spring or along the shoreline of a lake where waters are saturated with calcium carbonate.

Tufa- A porous limestone that forms from the precipitation of calcium carbonate, often at a hot spring or along the shoreline of a lake where waters are saturated with calcium carbonate.

Pumice - used for the dome of the Pantheon, Rome -  pumice concrete was understood as optimum for ceilings with its durable lightness. Thus the structure of the Pantheon proceeds from bottom (basalt foundations) to top in ever lighter materials which have served it well for durability.

Pumice - used for the dome of the Pantheon, Rome - pumice concrete was understood as optimum for ceilings with its durable lightness. Thus the structure of the Pantheon proceeds from bottom (basalt foundations) to top in ever lighter materials which have served it well for durability.

Granite is a coarse-grained, light colored, intrusive igneous rock that contains mainly quartz and feldspar minerals. The specimen above is about two inches (five centimeters) across.

Granite is a coarse-grained, light colored, intrusive igneous rock that contains mainly quartz and feldspar minerals. The specimen above is about two inches (five centimeters) across.

What You Need to Know About Igneous Rocks: Obsidian, an igneous rock that occurs whenever lava cools very quickly

What You Need to Know About Igneous Rocks: Obsidian, an igneous rock that occurs whenever lava cools very quickly

Gabbro is a coarse-grained, dark colored, intrusive igneous rock that contains feldspar, augite and sometimes olivine. The specimen shown above is about two inches (five centimeters) across.

Gabbro is a coarse-grained, dark colored, intrusive igneous rock that contains feldspar, augite and sometimes olivine. The specimen shown above is about two inches (five centimeters) across.

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