Hi, I recently found this mineral in a volcanic rock (we call them 'thundereggs') and I was wondering if you could identify it. Since I can't upload an image, I'll describe it to you as best I can- it is the size and shape of an average pinkie-finger nail, is not very high when you lay it flat, about five millimetres. The top and bottom is quite flat, and it is a medium blue green colour, sort of like the colour of a greeny-blue sea at a seaport. I have a few others, one larger and the rfest smaller. I hope this is descriptive enough.
ps- it is also covered in this sort of chalky rocky stuff I can't get off. If you think the mineral is of any value, can you please give me some tips on cleaning it? Thanks so much =)