Dims: 5.39x4.25x3.40" (13.68x10.80x8.64cm)
Wt: 47.06oz (1334g)
uncertain, likely Arizona, USA
This large specimen is not very pretty, but it contains a great deal of peridot. About 30% of the total surface is covered with a green crust, which a loupe shows to be a druze of green peridot crystals. Additionally, there is a patch containing a large crystal over 4cm in length. One side of the host rock contains a brown patch of uncertain composition. It looks like a brown opal in some places, and much like a brown oligoclase in others. At first I thought its bright colorful irridescence (under a loupe) was from moonstone, but some of the peridot displays the same colorful irridescence (but to a lessor degree), leading me to think that both are covered by a thin coat of some irridescent mineral such as chalcopyrite.