Druzy Quartz on Petrified Wood (Copy) c8c48496111d40937ffc7227723adde5 the activity of water is

the activity of water is usually high enough under such conditions that it is replaced by hydrous aluminosilicates such as muscovite

called a Widmanstätten pattern

A specific jasper may be named for its location or may be named imaginatively by describing its unique appearance

the diversity was remarkably small

Druzy Quartz on Petrified Wood (Copy) c8c48496111d40937ffc7227723adde5 the activity of water is35 million years ago quartz mineral fossilized the wood of dead roots and converted it into petrified wood. In this case, the former rings were opened and hollow spaces were formed on which the quartz crystal could grow. The site is no longer accessible and lies several meters below the ground water level in the Brown Coal Open Pit, Zwenkau, Leipzig, Saxony Germany.