Obsidian is a rock which is a type of naturally occurring glass produced by volcanoes. It lacks crystal structure, which can make it have extremely thin edges. This is the reason why obsidian was often used as arrowheads in a variety of ancient cultures. You can have your very own arrowhead to show to your friends! A great collectible item for the Native American art collector!
Please be aware that this is a natural mineral and as such each piece is one of a kind! The one you receive may not be exactly the same as the ones pictured but it will be similar. Price is per each piece. They come in irregular shapes, sizes and weights.
The Wimshurst Machine is a high quality static machine for student labs.
Cool new Pi tee featuring ultra soft and light blue 100% cotton shirt.
This microscope is so versatile you can even take it with you on a job site!
Get swept away by this fantastic robot kit that uses vibrations to move!
Check out this amazing renewable energy science kit featuring the wonders of hydroelectric power!
Build 20 different solar powered models with unique building pieces, controlled by an RC handset!
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.