Mineral

JH · Post by JH » Mon Apr 02, 2018 1:28 pm

A closer look at this mineral https://skfb.ly/6uSI9

3D: https://skfb.ly/6xQys

40x objective, 75x on sensor (x axis approx. 0,5mm)

Crossed eye-stereo

Best regards
Jörgen Hellberg

GaryB · Post by **GaryB** » Mon Apr 02, 2018 3:20 pm

Very nice, Jörgen

Harald · Post by **Harald** » Tue Apr 03, 2018 10:17 am

Hi there Jörgen,
The 3D model is one of the best I´ve seen from stacking.
Very well executed shots

Thanks for sharing

Cactusdave · Post by **Cactusdave** » Tue Apr 03, 2018 11:51 am

Very nice result indeed at this rather high magnification. I'm sure people would be interested in the objective and method of illumination if it isn't a trade secret.

I assume the mineral is Bornite, aka 'peacock ore', an iron, copper sulphide mineral known for it's iridescent colours.

https://en.wikipedia.org/wiki/Bornite

I've not seen a brilliant cleavage face exposed like this. Did you create it or was it a natural feature on your sample?

JH · Post by JH » Tue Apr 03, 2018 12:39 pm

Thanks GaryB, Harald and Cactusdave!

Cactusdave wrote:Very nice result indeed at this rather high magnification. I'm sure people would be interested in the objective and method of illumination if it isn't a trade secret.

I assume the mineral is Bornite, aka 'peacock ore', an iron, copper sulphide mineral known for it's iridescent colours.

https://en.wikipedia.org/wiki/Bornite

I've not seen a brilliant cleavage face exposed like this. Did you create it or was it a natural feature on your sample?

No trade secret, just slightly polarized EPI-light trough a Nikon Plan Fluor ELWD 40x / 0.60 00/0-2 WD 3.7-2.7

Thanks for the ID- of the mineral!

I have only done some minimal cleaning but I do not know how it was treated before I got it.

Best regards
Jörgen Hellberg

Edit: I do not know the history of this mineral and it seems to be quite simple to "change" chalcopyrite to look like this, so I am not totally sure about the ID.

Cactusdave · Post by **Cactusdave** » Wed Apr 04, 2018 12:50 am

You are right it could be chalcopyrite, another copper, iron sulphide closely related chemically to bornite. To a non mineralogist like me the less common iridescent form of chalcopyrite can look pretty similar to bornite. A view of the entire mineral piece might help.

Jacek · Post by **Jacek** » Fri Apr 06, 2018 8:18 am

Very nice

JH · Post by JH » Sun Apr 08, 2018 3:29 pm

Thanks Jacek

Cactusdave - The reason that I am not sure if this is bornite or chalcopyrite is this text:
https://csmsgeologypost.blogspot.se/201 ... yrite.html

Obviously, it is quite easy to change chalcopyrite.

Any way it is a nice looking mineral.

Best regards
Jörgen Hellberg