Marburg Schist Thumbnail, Pre-Cambrian (1+ Billion Years), Maryland

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This is a thumbnail-sized specimen of Marburg Schist rock from Carroll County, Maryland, USA. This ancient rock dates from the middle to late Pre-Cambrian period (approx. 1 to 1.5 billion years ago).

Marburg schist is a bluish-gray to silvery-green, fine-grained, muscovite-chlorite-albite-quartz schist; intensely cleaved and closely folded; contains interbedded quartzites

This is some of the oldest rock in North America and dates from the time before life walked the Earth - life was mainly bacteria-like at this point in Earth's early history.

Refer to the photo. The black centimeter cube is shown for scale and is not included. You are purchasing a specimen like the one shown. Your purchase will include a labeled gemjar.