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Birefringence Horse by elsarose Birefringence Horse by elsarose
I just found this - it is really old (maybe 2 years or more) but I stil liked it so here you go.

The circle behind is what thin slices of rocks look like under a microscope - I do that kind of picture for my degree actually!

The left-hand side of the circle is what it looks like in plane-polarized light and the right-hand side is in cross-polarized light.

The reason for all those amazing colours is something called "birefringence" - look it up.

:star: COMPETITION :star:
If anyone can name the type of rock shown in the thin section behind the horse - then you will win a prize (a drawing done for you I guess).

Meanwhile - enjoy the twinning, birefringence, cleavage, relief etc.

Go geology :D
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:iconmiss-picc:
Miss-Picc Featured By Owner May 6, 2011
Olivine and feldspar (plagioclase), it must be mafic or ultramafic. Since I can't see any minerals with typical pyroxene cleavage, I'm gonna say it's ultramafic. :D

Also, lovely picture. Thin sections can be really quite beautiful!
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:iconelsarose:
elsarose Featured By Owner May 6, 2011  Hobbyist Traditional Artist
Pretty much spot on :D

It is olivine gabbro

The minerals ARE mostly plagioclase feldspar with olivine.

I love thin sections but sadly don't work with them any more as I've moved onto doing petroleum geophysics so just seismic sections for me...

You win a free commission :D (I had completely forgotten about this picture lol)
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:iconmiss-picc:
Miss-Picc Featured By Owner May 6, 2011
I took some geophysics during undergrad, loved every bit of it EXCEPT seismics (I'm really terrible at manipulating the raw phone data into sections that actually work...)! XD
I do environmental geochem these days, but I still have a soft spot for igneous petrology.

Woohoo free comission! Please draw something wondeful to do with geology :D
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:icondefcon0ne:
defcon0ne Featured By Owner Nov 24, 2010
Mg2SiO4 - Fe2SiO4
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:icondefcon0ne:
defcon0ne Featured By Owner Nov 24, 2010
Olivine
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:iconelsarose:
elsarose Featured By Owner Nov 24, 2010  Hobbyist Traditional Artist
Definitely olivine in there (bright birefringence colours, irregular fracturing) - but there is also a lot of another mineral (low order birefringence, twinning). Which is that? What type of rock overall?

Lol - I feel like a teacher!

And thanks for the fav!
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:iconitisjustyuna:
ItisjustYuna Featured By Owner Jul 1, 2010  Hobbyist Photographer
Yeep, looks really cool! :3
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:iconelsarose:
elsarose Featured By Owner Jul 1, 2010  Hobbyist Traditional Artist
Thanks - I guess it is quite original.
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Submitted on
July 1, 2010
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HP pst2600
Date Taken
Jul 1, 2010, 3:21:34 PM
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