Witam
Porównanie do oryginału wypadło tak:
The thin section and sample arrived Monday October 24. I looked at it. It is not d?Orbigny.
The feldspar in d?Orbigny is skeletal. Skeletal is also called hopper shaped. Your feldspar is not skeletal. I can explain more if you want.
Many mineral grains in d?Orbigny are zoned. This shows as color change in mineral grains in thin section under the microscope. For example, a mineral grain will appear red around the edge and yellow in the center. Or dark on the edge and light in the center. Your stone has very little of this. I can explain more if you want.
Your stone looks to have some additional minerals that are not in d?Orbigny.
My guess is that you have a terrestrial basalt.
Pozdrawiam Kazimierz
#16 · 1 lis 2011