This transparent colorless variety of Quartz is still known as rock crystal. Long ago, people believed that rock crystal was a compact form of ice: crystallos actually means “frozen.” The best rock crystal has the clarity and shimmer of crystal clear water. Although colorless Quartz is relatively common, large flawless specimens are not, which is why most crystal balls these days are made of glass, not Quartz.
There are two main varieties of quartz, though they share the same chemical composition, silicon dioxide. Macrocrystalline quartz, includes stones like amethyst, aventurine, rock crystal, blue quartz, citrine, hawk’s eye, prasiolite, quartz cat’s eye, smoky quartz, rose quartz and tiger’s eye. The quartz is mostly transparent to translucent. Cryptocrystalline quartz, with microscopically small crystals, is known as chalcedony, and includes agate, chrysoprase, bloodstone, jasper and carnelian. Crytocrystalline quartz is usually opaque or translucent.
This particular rock crystal quartz specimen has been shaped into the form of an obelisk, which makes it a perfect gift or desk decoration for earth science teachers or for geology enthusiasts.
Durable, anti-fog safety glasses that fit comfortably on any head size.
These goggles meet the ANSI Z87.1, 2010 High Impact standards.
Extra-small nitrile exam gloves designed and manufactured for superior protection against viral, bacterial, and certain chemical hazards.
Recommended for protection against chemical splashes. A must have for every young chemist!
Large nitrile exam gloves designed and manufactured for superior protection against viral, bacterial, and certain chemical hazards.
Extra thick medical examination gloves - 60mil. Great for extra protection.
Build an electromagnet, an electrical catapult, a doorbell chime, a telegraph, and more with this kit!
Use this awesome prism to teach about optics and light in the classroom setting!
See the solar system in action!
This quality Dobsonian style telescope features a 76 mm aperture reflector optical tube.
Working model representing the sun, earth, and moon and their relationships.
Every kid needs one of these spheres!
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