Its hardness is anisotropic and ranges from 3-4.
Slate, being a metamorphic rock, would not have a hardness listing on the Mohs scale of mineral hardness.
Slate is a rock of mixed mineral composition and does therefore does not possess a uniform Mohs hardness. Because of varying porosity along with other factors, the elastic modulus, or measurement of stiffness, of various slate specimens will vary.
Slate is a rock, so you won't find it listed on the Mohs Scale, because that scale of hardness applies to minerals. I'll go out on a limb though, and suggest that slate is probably around 2 to 3 or so, but this will be variable, depending on the quality of the slate, and degree of weathering, etc.
Slate is a relatively soft metamorphic rock. It falls between the hardness of a soft rock, like talc, and a medium hardness rock, like marble. It is commonly used for roofing, flooring, and other construction purposes due to its durability and resistance to staining.
Marble would be the most durable and beautiful but more difficult to carve than slate due to it's hardness .
The floor is first leveled, if necessary. As the table is assembled, a long and a short level are used for the important surfaces. When the slate is laid on the table, the levels are again used as the slate is fastened, with very small shims used to level the slate. After the slate is fully tightened and finished, the level is checked. The level of effort required to level the table surface depends upon the quality of the table and proper assembly.
Yes, slate is not necessary, but the level of play may not equal to even a cheap slate table.
Stainless steel has a hardness level of around 5.5 on the Mohs scale.
There are many different levels of hardness in drivers seats. The level of hardness depends on the car and maker.
The highest level on the Mohs hardness scale is a level ten. Diamonds are at a level ten and are also intrusive rocks. However Intrusive rocks can be at almost any level of hardness based on the minerals the rock contains.
You don't balance a billiard table, but you level it. This starts by making sure the floor is level. As the table is put together, the foundation is first leveled before the slate is installed. This should be done using a large level and a string level. After the slate is installed, the same process is used and small shims are inserted under the slate as it is tightened down. When the table seems completely level, the slate is finished and the level is re-checked. Most installers will also slowly roll a ball across the table in different paths to be sure the surface is correct before covering the slate.
Calcite has a hardness level of 3 on the Mohs scale, which means it is relatively soft and can be easily scratched by harder minerals.