Hello folks, I was up in the mountains of Prescott, AZ when I
came across some granite-like rocks with bands (about an inch wide)
of avocado-green. Do any of the minerologists out there know what
the green is? Can it be polished in to cabs or inlay? Thanks!
I wonder if this might be variscite (also known as Utahlite, found
in Utah). The only reference I could find of its occurrence was that
it is “formed by direct deposition from phosphate-bearing water that
has reacted with aluminium rich rocks in near-surface environments”.
Make of that what you will - perhaps some geologist out there can
tell us whether this is igneous (granite is igneous) rock business.
I have a small sample of this which is definately avocado green (the
colour of part you eat, not the skin that is). It has a hardness of 4
to 5 and polishes up to a waxy lustre and can look quite nice. Too
soft for a ring though.
Renate in Adelaide, South Australia where the rain is bucketing down
yet again and spring is hiding.