sand - quartz - angular grained beach sand, primarily quartz, from Zuma Beach, Malibu, California in a 250 ml display bottle with ground glass stopper
This sand is particularly interesting because of the angular nature of the quartz grains. As sand is transported down streams, feldspar disintegrates and weathers to clay. Quartz is resistant, so the sand delivered to the mouths of streams is frequently quartz rich, as is this sand. The grains become rounded as they are transported along the stream channel. The angular nature of these grains shows that transport was short.
This sand provides an excellent contrast with sands where the grains are rounded, such as the orange red sand derived from the Navajo Sandstone, originally transported across the continent from the Appalachians, concentrated into a huge dune field in present day southern Utah, lithified into sandstone, weathered again to sand and once again forming dunes. Those grains are smoothly rounded and coated with iron oxide.
These bottles are 250 ml, 5" high, with a ground glass stopper, and make a good display. Note that these have been affected by covid. No germs, but bottles from our regular supplier look like they were made by someone working remotely, grinding the stoppers by hand. Formerly the neck of the bottle and the stopper were machine ground and fit perfectly. Now the fit is loose, so we ship these with a cork, but supply the "rustic" glass stopper along with the cork until we run out of "covid specials" and can get machine-ground bottles again.
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