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UV MineralsFeldspar Fluorescent

20th Mar 2017 06:34 UTCCostas Constantinides

05906810016019501604661.jpg
Can someone help to ID this Fluorescent Feldspar..It comes from Mica Creek. Pegmatites near Mount Isa .Qld .Australia.What type of feldspar is it likely to be.

06970760015846726878181.jpg

20th Mar 2017 06:45 UTCAlfredo Petrov Manager

perthite ?

20th Mar 2017 08:08 UTCWayne Corwin

Yup, perthite !

20th Mar 2017 11:05 UTCPavel Kartashov Manager

Fe3+-bearing microcline.

20th Mar 2017 11:20 UTCSusan Robinson

Perthite is not a mineral species name. To my understanding, perthite, is a term used to denote the texture of feldspar that is a mix of albite and K-spar (microcline).


Susan Robinson

20th Mar 2017 11:42 UTCWayne Corwin

Sorry Sue,,,, I don't know what else to call it.

20th Mar 2017 12:50 UTCSusan Robinson

Pavel's answer might be more correct?


Susan Robinson

20th Mar 2017 15:32 UTCEd Clopton 🌟 Expert

Looks like perthitic microcline to me.

20th Mar 2017 18:14 UTCHarold Moritz 🌟 Expert

Microcline - its all pretty much perthitic.

20th Mar 2017 23:55 UTCCostas Constantinides

Thank you for answers.I read microcline fluoresced ,But since this was identified as perthite and is albite/microcline ,would the the perthite fluoresce.I should also ask is perthite a mixture or are the feldspars stratified.

21st Mar 2017 12:20 UTCHarold Moritz 🌟 Expert

Perthite is a texture, not a mineral or a mixture. The "veining" texture is from albite that has exsolved from the microcline host while in the solid state. At high temperature, when the microcline crystallized, the albite was essentially dissolved in it. At lower temp that mixture was no longer stable and over millions of years the albite exsolved out. Other examples of this phenomenon are kamacite/taenite of iron meteorites and tephroite/willemite crystals from New Jersey.


Essentially all microcline is perthitic (much of the texture can be microscopic) so I don't even consider there to be a distinction. It does not affect fluorescence of the microcline, in fact in some cases the albite will fluoresce blue and the microcline red.

https://www.mindat.org/photo-475740.html


In other situations, albite crystals can form on top of the albite veining in a microcline crystal!

https://www.mindat.org/photo-387758.html see child photos also

https://www.mindat.org/photo-280920.html

21st Mar 2017 13:35 UTCDavid Von Bargen Manager

Actually perthite is special case name for a texture for describing albite exsolution areas grown in a microcline crystal (antiperthite is microcline exsolved in albite). Other mineral pairs are usually referred to simply as exsolution features for the two minerals

21st Mar 2017 23:59 UTCCostas Constantinides

Thank you all for help and explanations..
 
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