labradorite is a feldspar; most countertops, foyers, building
facades, etc, are usually larvikite, also a feldspar but with mostly
blue ‘fire’. labradorite’s almost endless choice of color makes it
one of my all-time favorites to cut for jewelry. however, most of the
rough on the market has been mined by blasting - requiring more
grinding and sanding because of its ‘every-which-way’ cleavage -
don’t drop a prize piece on a hard floor before you’ve got it trapped
in a bezel!
‘fire’ in labradorite comes in cobalt and lighter blue, purple,
green, turquoise, pink, peach, gold, lime green, and combinations.
some labradorite also has diagonal stripes (always diagonal because
the best fire shows at that direction) - color breaks - across the
face. ‘fire’ is directional - a slab with best fire showing one way,
you have to flip end-over-end to see it best on the reverse (like a
coin’s obverse and reverse). spectrolite is more intensely blue and
is dense enough to cut in thinner slabs but still has the cleavage
thingy going with it.
try it -