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with the black looking just like weathered obsidian
Sand on the beaches of the Bay of Campeche on the Gulf Coast of Mexico can be entirely composed of shell fragments
Your students can compare this sand with the source material
We could have run it through a concentrator to increase the garnet content
or you can let us make the selection
sandstone - medium grained gray - 4" diameter oil well core section from the Stevens Sand with the black looking justOil well 4" diameter core section from the Stevens Sand, a prolific Upper Miocene oil producer in California's San Joaquin Valley. This medium grained sandstone is composed primarily of quartz with feldspar and some biotite. The Stevens sand is derived from the rapid uplift of the Sierra Nevada during the Miocene. A plug was occasionally removed from each core for determination of permeability and porosity of the sand. Well data has been lost for this
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