Eisco Pegmatite Specimen, 3cm in size

• Pegmatite sample approximately 1" (3cm) in size
• Igneous rock containing a large variety of crystal sizes
• Perfect size for use in classroom identification labs and exercises, correlates well to Next Generation Science Standards Evidence Statements
• Pegmatite indicates two different periods of cooling - one quick, one slow
• Specimen comes in clear labeled and barcoded bag for ideal storage

Pegmatite is an igneous rock that contains two vastly different crystal sizes. This combination of both phaneritic and aphanitic crystals indicates this rock formed at two vastly different cooling rates. Pegmatite is a classic rock for teaching igneous petrology, and is also useful in volcanology classes. Each sample is approximately 1" in length and comes in a labeled plastic bag.