This large chunk of Black Tourmaline, 2-3 inches in diameter, is great for any mineral collection.
In its natural state, all Tourmalines are characterized by parallel ridges (striations) which run the length of the crystal. Tourmaline forms in igneous and metamorphic rocks and veins, and have a different shaped top than the bottom of the crystal. Another interesting characteristic is that this stone is a pyroelectric which means that when heated, a positive charge develops at one end and a negative charge at the other.
FOUND IN: TANZANIA, MADAGASCAR, BRAZIL, AUSTRALIA, SRI LANKA, RUSSIA & USA
Tourmaline’s name comes from the Sinhalese word “turmali,” which means “mixed.” Tourmaline, occurring in more colors and combinations of colors than any other gemstone variety, lives up to its name. Known for centuries, tourmaline first gained popularity when the Dutch began to import it in the early 17th century from Sri Lanka . Tourmaline is actually the name of a group of related mineral species. In gemological practice, individual species names are not used. Instead, all are simply termed tourmaline.
Color is the major characteristic for tourmaline. This stone is found in more hues, shades and nuances than any other gem.
Black Tourmaline Specifications:
Use this temperature-controlled soldering station for a variety of soldering applications!
Build a hand that realistically moves its fingers using shape memory allow technology!
Defy gravity with this cool balancing eagle!
This science kit is an essential introduction to physics knowledge!
A touch of joy. A touch of science. Light responds to your touch and to the music in your room!
Every kid needs one of these spheres!
At xUmp.com you will find a large selection of scientific products carefully curated by real scientists and educators. We sell everything from educational toys, teacher supplies for science classroom, lab equipment, science toys, science fair supplies, classroom equipment, chemistry glassware, chemistry lab equipment, physics demos, electronics supplies, robots, science kits to geeky science gifts.