sand - quartz - angular grained beach sand, primarily quartz, from Zuma Beach, Malibu, California - set of two 2-ounce jars there are so many broken

there are so many broken fragments in this tuff that it is called a tuff breccia

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Set of five tubes

Better than average student specimens

sand - quartz - angular grained beach sand, primarily quartz, from Zuma Beach, Malibu, California - set of two 2-ounce jars there are so many brokenThis 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