Zircon is a zirconium silicate mineral that is very hard, physically durable and chemically resistant to modification.
From the scientistatwork.blogs.nytimes.com
The effects of antimony trisulfide Sb S and zirconium silicate in the automotive brake friction material on friction.
From the en.wikipedia.org
These crystals, made of zirconium silicate and not to be confused with cubic zirconia, are tough and relatively resistant to melting.
From the foxnews.com
Geologists have long been puzzled by the presence in the sands along Australia's east coast of minerals including zirconium silicate, or zircon, which can't be found in local rocks.
From the newscientist.com
We don't have any rocks that go back 4.4 billion years, but there are these amazing single grains of a mineral called zircons, which are made from a very resilient mineral called zirconium silicate.