if placed by 12PM EST
- Graywacke sample approximately 1" (3cm) in size
- Sand-sized clasts with a matrix of clay particles
- Perfect size for use in classroom identification labs and exercises, correlates well to Next Generation Science Standards Evidence Statements
- This rock makes up most of the foundation of New Zealand
- Specimen comes in clear labeled and barcoded bag for ideal storage
Graywacke is a sedimentary rock composed of large, angular clasts within a fine-grained clay matrix. Formed during underwater avalanches, these rocks are often found on distal ocean shelves. Useful when digging deeply into sedimentary petrology and classification, graywacke can also be used in general identification exercises. Each sample is approximately 1" in length and comes in a labeled plastic bag.