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Rock and Mineral Dictionary
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

Click on an underlined word for more information on that subject.
If the rock or mineral term you are looking for is not in the dictionary, please e-mail us and we'll add it.

Q


quartz

Quartz is a crystalline mineral that come in many forms, including amethyst, aventurine, citrin, opal, rock crystal, tiger's eye, rose quartz,and many others. Rutilated quartz and tourmalinated quartz have needle-like inclusions of other minerals. Quartz has a hardness of 7.0. This common mineral is found worldwide.

quartz druze

Quartz druze is a layer of quartz crystals that form within a mineral crust, like the inner cavity of a geode. For example, the inner cavity of agate geodes are often lined with a druze of sparkling quartz crystals.


quinzite opal

Quinzite opal is a red to pink type of opal. This opal is also called Quincite, Quincite Opal, and Rose Opal.


Quaternary period

The Quaternary period, "The Age of Man" (1.8 million years ago to the present), is the most recent period of geological time.

EnchantedLearning.com
Rock and Mineral Dictionary
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

Click on an underlined word for more information on that subject.
If the rock or mineral term you are looking for is not in the dictionary, please e-mail us and we'll add it.

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