Sagenitic Biotite

The term "sagenitic texture" refers to the occurrence of slender, needlelike inclusions intersecting at angles of 60° and included in phlogopite, quartz, or other minerals The most extensive study of sagenitic texture was carried out by NigSli (1965), who used electron microprobe techniquest o analyzes Sagenites in biotite from plutonic rocks. The genesis of inclusions of rutile is considered to be formed, in biotites and / or phlogopite rich in titanium, for exsolution phenomena, this gives rise to crystals of rutile and / or titanite.

Bibliography



• Deer, W.A., Howie, R.A., Zussman, J. (1998) Rock-forming Minerals.
• Optical Mineralogy : The Nonopaque Minerals by Phillips / Griffen
• E. WM. Heinrich (1956): Microscopic Petrografy. Mcgraw-hill book company,inc
Stephen. A. Nelson


Photo
biotitesagenitica2012(2).jpg

Needlelike inclusions of rutile in Biotite. PPL image , 10x (Field of view = 2mm)
biotitesagenitica2012(4).jpg

Needlelike inclusions of rutile in Biotite. PPL image , 10x (Field of view = 2mm)
biotitesagenitica2012(3).jpg

Needlelike inclusions of rutile in Biotite. PPL image , 20x (Field of view = 1mm)
btconutilosaginiticoo(3).jpg

Needlelike inclusions of rutile in Biotite. PPL image , 10x (Field of view = 2mm)
btconutilosaginiticoo(4).jpg

Needlelike inclusions of rutile in Biotite. PPL image , 10x (Field of view = 2mm)
btconutilosaginiticoo(2).jpg

Needlelike inclusions of rutile in Biotite. PPL image , 10x (Field of view = 2mm)
btconutilosaginiticoo(5).jpg

Needlelike inclusions of rutile in Biotite. PPL image , 20x (Field of view = 1mm)
btconutilosaginiticoo(7).jpg

Needlelike inclusions of rutile in Biotite. PPL image , 20x (Field of view = 1mm)
btconutilosaginiticoo(6).jpg

Needlelike inclusions of rutile in Biotite. PPL image , 20x (Field of view = 1mm)