Riddle 1:

A week or so ago I went to this field trip. We went to some cool places and found some cool rocks, we even saw a 1Ma volcano, but I will write about that later.

Not volcano related, I found this rock, which contains an unknown mineral (unknown to me). It doesn’t have a great scientific importance but it made me curious. The rock is actually a piece of an amphibolite type mafic rock which was cross cut by veins of quartz and some feldspars. The mineral I’m talking about was deposited in such a vein, it doesn’t show any crystallographic features and most likely I will have to x-ray it to find out what the hell it is.

The phase I’m talking about is that yellowish/ cafe latte/ honeyish part in the upper/middle right part of the specimen.

And tiny part of my brain says “That is feldspar, why do you want it to be something else?!”. I hope is not feldspar.

Riddle 2:

A few months back I went to Argentina and I found this symplectite. It looks like feldspar is inter-grown with something that looks like an amphibole/pyroxene. It is incredibly beautiful and is quit large aprox. 5 cm^3. On the bottom of it (if you call that the bottom) it has a nice feldspar crystal.