Geological Terms Beginning With "J"

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Jade:

A translucent gemstone consisting of either jadeite or nephrite that is typically green in color. Jade is a very durable stone and is used for a variety of jewelry and ornamental objects. Typically cut in the cabochon shape or carved.

Jadeite:

A high pressure clinopyroxene that is frequently carved and polished as a gemstone.

Jasper:

A variety of colored chert, typically red or green and often found in association with iron ores. Jasper is frequently used as a gemstone or in the production of ornaments.

Jet:

A variety of coal that is frequently cut and polished for jewelry or ornaments.

Jetty:

A human made structure built at right angles to a coastline and extending into the water. Jetties are built to protect an area of shoreline from the effects of currents, erosion or deposition.

Joint:

A fracture in rock along which there has been no displacement.

Joint Set:

A group of joints that are parallel or nearly parallel. They are frequently formed at the same time interval from a common process.

Jolly Balance:

A spring balance used in the determination of specific gravity.

Juvenile Water:

Water that is new to the hydrologic cycle. Brought to Earth's surface through volcanic eruptions.

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