Tourmaline is a beautiful semi-precious gemstone that can be found in a variety of colors. Its beautiful shine and the rich color of the stone makes it a lovely mineral for jewelry pieces. It is a popular and affordable gem. It is quite a soft stone registering 7 – 7.5 on the Mohs scale of hardness. The refractive index is 1.615 through 1.655 and the specific gravity is 3.02 through 3.26. Tourmaline was officially registered in 1912 in the American Association of Jewelers.
Difference Between Condominiums and Apartments
Have you ever wondered why some people call their place of residence a condominium and others an apartment? Though these two terms are usually used interchangeably, but they are not exactly the same thing. Condos (or also called as condominiums) and apartments are very similar. There is no way we can know whether it is an apartment or a condominium by just looking at the building, or even visiting it. But in fact, there are differences and that also significant ones.Difference Between Townhouse and Duplex
Duplexes and townhouses are different in their construction. A duplex is a two storey building but each storey has its own entrance so that two families can live in that building. A town home or also called as townhouse, is a row of houses attached to other houses.Difference Between Concrete and Asphalt - Which is Stronger
Both asphalt and concrete are popular and strong materials to pave driveways and roads with. These two durable materials perform well in the rain and cold and can last for many years if they are maintained well. However, each has its advantages and disadvantages: