authigene

authigene

[′ȯ·thə‚jēn]
(mineralogy)
A mineral which has not been transported but has been formed in place. Also known as authigenic mineral.
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The corresponding SEM shows that authigene fibrous illite and siderite are around framework grains (Figure 11(b)).
Mesodiagenesis calcite, dolomite, albite, and illite were also the common authigene minerals in the water-bearing sandstones.