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Olivine gem from asteroid
  
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Roger Warin




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PostPosted: Jun 10, 2017 16:21    Post subject: Olivine gem from asteroid  

Hi
About olivine gem.
On Earth, there are various localities for olivine. Often black in terrestrial igneous rocks, it can be pretty when Mg content is high (forsterite).
This is often the case in asteroids.
Where is olivine (or peridot) ? In the pallasites, these meteorites, sponges of iron whose cells are filled with olivine. But these are small stones with many internal tensions. It’s difficult to cut them.
To prove its origin, one could invoke that the isotopic ratios of oxygen isotopes are depressed, but this highlighting is not within the reach of many labs.
I think it is simpler to see the planar deformations features (PDF's) in the crystal. They were caused by intense shocks as in Quartz in Shock-Metamorphosed Rocks (Impactites) in Impact Structures.
In the Esquel pallasite, I have not seen any.
Roger.



016-Jepara_gemme#1-1A&B-1_R.jpg
 Mineral: Olivine
 Description:
Jepara Pallasite
 Viewed:  785 Time(s)

016-Jepara_gemme#1-1A&B-1_R.jpg



017-Peridot_Jepara_1b_R.jpg
 Mineral: Olivine
 Description:
Jepara pallasite
 Viewed:  785 Time(s)

017-Peridot_Jepara_1b_R.jpg



018-Esquel_gemme#1-1Aa_R.jpg
 Mineral: Olivine
 Description:
Esquel - Argentina
 Viewed:  784 Time(s)

018-Esquel_gemme#1-1Aa_R.jpg


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