Purple jade (metaphonolite) (Paleozoic or Mesozoic protolith; Late Cretaceous metamorphism, 80 Ma; paleoclast in Middle Miocene debris flow breccia; Bursa Province, Turkey)

            Purple jade (= finely-crystalline jadeite-K-feldspar-lawsonite-aegerine metamorphite) (10.2 centimeters across at its widest) - blueschist facies metaphonolite from Bursa Province (probably near Akpinar in southern Bursa Province), northwestern Turkey.
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Purple or lavender-colored jade is very rare.  Such rocks are known from Burma, Turkey, and parts of Central America.  Purple jade from Turkey is a polymineralic metamorphic rock with a complex origin.  Published research indicates that this material was originally Paleozoic- or Mesozoic-aged phonolite lava, an alkaline, intermediate, extrusive igneous rock.  During the Late Cretaceous, at about 80 Ma, blueschist facies metamorphism (= high-pressure, low-temperature) altered the phonolites into rocks dominated by jadeite pyroxene, potassium feldspar, lawsonite, and aegerine pyroxene, with minor monazite, phengite, and secondary sericite.
 
During the Cenozoic, tectonic uplift, surficial exposure, and paleoerosion of these blueschist-facies rocks resulted in them being incorporated in landslide deposits (debris flow breccias).  Turkish purple jade is collected as loose paleoclasts eroded from these Middle Miocene debris flow breccias.
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Info. synthesized from:

Okay, A.I.  1997.  Jadeite-K-feldspar rocks and jadeitites from northwest Turkey.  Mineralogical Magazine 61: 835-843.

Okay, A.I.  2004.  Tectonics and High-Pressure Metamorphism in Northwest Turkey.  Italia 2004, 32nd International Geological Congress Field Trip Guide Book - P01.  56 pp.

Hatipoglu, M., Y. Basevirgen & S.C. Chamberlain.  2012.  Gem-quality Turkish purple jade: geological and mineralogical characteristics.  Journal of African Earth Sciences 63: 48-61.

   

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Taken on: May 7, 2012

Tags:

purple

jade

Bursa

Turkey « less

Sets appears in: • Jade • Turkey Rocks & Minerals more » • Purple Rocks & Minerals • Precious & Semi-Precious Gemstones • Cretaceous Rocks, Minerals, Fossils • Purple jade (Late Cretaceous; Bursa Province, Turkey) « less

Groups appears in: • Most Beautiful Rocks and Minerals

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