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J

 

Jackleg

A percussion drill used for drifting or stopping that is mounted on a telescopic leg which has an extension of about 2.5 m. The leg and machine are hinged so that the drill need not be in the same direction as the leg.

 
Japanese Law Twin

A particular twinned form in quartz, with two crystals joining each other at an angle of about 84 degrees. The individual crystals are often flattened prisms.

 
Jasper

In contrast to chalcedony, is an opaque and more coarsely grained cryptocrystalline quartz. Like chalcedony, it may be patterned or uniform in color.

 
Joint

A divisional plane or surface that divides a rock and along which there has been no visible movement parallel to the plane or surface.

 
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