Schist - Micaceous

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LL Demos & Labs: Rock Profile: Sandstone

These dark red samples, colored by the oxidized iron mixed in with the sand, were collected in Utah and were deposited in a relatively dry environment during the time that the dinosaurs roamed the earth. Sandstone gets its name because it ..

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LL Demos & Labs: Rock Profile: Pumice

This pumice comes from Central Oregon, is cream colored with occasional pink tints and is very light and holey. When the magma formed deep underground, a lot of water got mixed into the melt. As this water- rich lava erupted from the vent, th..

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LL Demos & Labs: Rock Profile: Vesicular Basalt

This is a dark gray rock with lots of large, irregular holes that hail from Central Oregon. Once outside, the hot lava cools very quickly as it comes into contact with either the air or ocean water. This rapid cooling prevents miner..

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LL Demos & Labs: Rock Profile: Obsidian Family

This specimen comes from Northern California near Glass Butte. Obsidian is formed from rhyolitic lava which contains a lot of silica, the material used to make glass. Because rhyolite is a thick, sticky kind of lava, it oozed from th..

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LL Demos & Labs: Rock Profile: Obsidian Family

This specimen comes from Southern Utah, near Beaver. Obsidian is formed from rhyolitic lava which contains a lot of silica, the material used to make glass. Because rhyolite is a thick, sticky kind of lava, it oozed from the ground s..

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LL Demos & Labs: Rock Profile: Obsidian Family

This specimen comes from Northern California near Glass Butte. Obsidian is formed from rhyolitic lava which contains a lot of silica, the material used to make glass. Because rhyolite is a thick, sticky kind of lava, it oozed from th..

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LL Demos & Labs: Rock Profile: Obsidian Family

This specimen comes from Glass Mountain in Northern California. Obsidian is formed from rhyolitic lava which contains a lot of silica, the material used to make glass. In fact, if you should ever walk across an obsidian deposit, it w..

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LL Demos & Labs: Rock Profile: Mudstone

This specimen is a dark purple in color and comes from an ancient seabed located in northern Utah. Mudstone is composed of the smallest sediment particles that are, by geological definition, 1/256 mm or smaller. These particles settle on to..

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LL Demos & Labs: Rock Profile: Diorite

Diorite is found in Oregon and Washington and is the halfway point in mineral mixtures between gabbro and granite. It is lighter than gabbro and darker than granite or quartz monzonite. Different minerals have different melting and “fr..

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