This VERY interesting rockhound story was written by Don Kasper (thanks for letting me post it for all my readers!). He tells me he doesn’t belong to any rock clubs but does associate with the Culver City rock club now and then. Again thanks to Don for the post and looking to hearing more of his rockhounding trips in the future!
Colorado River and Western Arizona Outing Notes:
Had the opportunity to meet up with Tony and Friends with the Needles
rock club last weekend. I thought I would document some of the photos
Tony took and maybe add a few cents on identifications of what we
found. We spent some effort to assemble collections in the photos
list for others to compare to our identifications. First I would
offer a few definitions that I use when I rockhound in the Mojave.
They would be:
Opalite: Opalized volcanic tuff. Opalite can come in a variety of
colors and can be associated with common opal and agate. Common
colors are whites, tans, and browns. Often has a wet appearance when
freshly fractured. Can be dendritic, if so, it’s a fine, hard
dendritic pattern occurring within the rock that can take a polish.
This material is very hard, forming prominent ridges and outcrops in
the . This is not colored common opal, which is much
softer, fractures readily, and forms rolling hills upon weathering.
Pastelite: Pastel colored Chert occurring in volcanic tuff and in
decomposed volcanic tuff and ash, that is, in Bentonite clay. This is
a highly expansive clay that looks like popcorn when dry, being
readily crushed when you walk on it. Common colors of Pastelite are
whites, tans, greys, browns, and blacks. The prized colors are blues
and violets. Can be solid, banded, and brecciated in appearance. Can
be concentrically banded to look like Wonderstone.