Eisco Quartz - Rock Crystal Specimen (Mineral), Approx. 1" (3cm) Material_PVC and triple bonds

and triple bonds

illustrating the high-ratio speed reduction and self-locking action of worm gearing

Connector 10 mm o

and lever-principle demonstrations

Hollow-bodied for filling with water

Eisco Quartz - Rock Crystal Specimen (Mineral), Approx. 1" (3cm) Material_PVC and triple bondsQuartz sample approximately 1" (3cm) in size A classic mineral, quartz is useful during lessons on mineral hardness, luster, and fracture Perfect size for use in classroom identification labs and exercises, correlates well to Next Generation Science Standards Evidence Statements Euhedral crystal expression is perfect for collections Specimen comes in clear labeled and barcoded bag for ideal storage Quartz is one of the most abundant minerals on Earth.