This natural Brown Cassiterite originates from Australia and its weight is about 5 carats. The measurements are 9.86mm x 6.05mm x 4.06mm (length x width x depth). The shape/cut-style of this Cassiterite is Octagon Facet. This 4.5ct Cassiterite gem is available to order and can be shipped anywhere in the world. Gemstone Certification can also be provided as an optional service.
Cassiterite is a tin oxide mineral, and is the primary ore for tin. In addition to its important industrial use, it has some interesting properties that make high quality crystals valuable as gemstones. Cassiterite is reasonably hard, with a rating on the Mohs scale of 6 to 7. It tends to be opaque though thin crystals can be translucent. Its chief virtue is its multiple crystal faces and outstanding luster. Many specimens are graded as having "adamantine" (diamond-like) or submetallic luster.
Cassiterite is one of the densest gem materials known. It also has a very high refractive index, higher than zircon, sphene and demantoid garnet.
I have always been skeptical of ordering fine items online for fear of disappointment. Today, Thursday April 26, I received the blue sapphire which I ordered on Monday, April 23. Not only was I impressed with the rapid delivery of my sapphire, but I was very pleased with the way the stone was packaged and protected. The sapphire itself was far better quality than I had anticipated and it will make a beautiful centerpiece for the ring I'm having made. Thanks so much for the great experience...
I enjoy this newsletter for the information and descriptions of the gems as well as all the history and myths surrounding the various gems. This newsletter makes me wish I was young so I could study to be a gemologist!