| The stone that I faced was designated G8904 by Carlos (Pareja Minerales) for his stock control.
There is one pic, (RISSANI-wholescanG8904.JPG) which is a scan of the face I put on the G8904 stone.
Microscope pics are only x10. I used a decollimated red laser and a green LED to illuminate
the metal fragments in the stone alongside white light to illuminate the rest of the stone.
Some pics are reflected distant white light that give the appearance of city lights from space.
I used carborundum wet and dry paper down to 600 then tin oxide.
Some of the brown spots on the face are remainder of the fusion crust.
I guess I need to cut one right through the middle.
I have not done that yet, as I thought I may be damaging a specimen before it is examined.
Curiosity got the better of me, so I faced one off.
Image Unclassed-Rissani-001.JPG has a large metal flake visible, it is actually a little over 1mm.
This metal flake is visible in other images and I use it as a reference point to gauge the stones rotation.
The laser light tends to light up the metal, and the distant white light also shows polished silicate minerals. This reminds me of Vaca Muerta mesosiderite material.
The G8904 stone currently weighs 24.5 g
There appears to be 3 lithologies in the stone.
1. Grey, with lots of metal (1.5mm down to specks) and many small white inclusions.
2. Large white/cream inclusions 1-2cm. containing visibly less metal than lithology 1.
3. A grey lenticular shaped inclusion with no metal, apart from the 1mm flake intruding slightly into it.
visible at top left of image RISSANI-wholescanG8904.JPG.
I currently have 28 of these stones, ranging from 12g to 50g, one 45g stone is broken in half and displays a similar interior.
Thanks for looking at these, sorry if the image quality is a bit poor. I think I need a nice new digital camera with macro.
Cheers for now, Kevin Forbes, VK3UKF. |
