What is the concept of stone hardness 3 0

The hardness of the stone is a relatively broad value, 1-10 degrees. 1. The stone talc with the smallest hardness, the hardness is 1, the gypsum hardness is 2, the hardness of Shoushan stone engraved with the seal is 3, fluorite is also called fluorite (fluorite) hardness is 5 apatite hardness, orthoclase hardness is 6, Hetian jade hardness quartz stone field hardness is 7, topaz hardness is 8, corundum hardness is 9, diamond hardness is 10. Generally, below 4 is soft stone, 4-7 below is neutral, and above 7 is hard.

It is generally expressed in terms of Mohs hardness. From level one to ten, getting harder and harder. Talc, gypsum, calcite, fluorite, apatite, feldspar, quartz, topaz, corundum, diamond. A person's fingernails can scratch the plaster, but they can't scratch the calcite, and the knife can leave and right. You can't move the feldspar.

Mohs) was the first to propose.

Hardness refers to the ability of a material to resist a hard object pressing into its surface locally.

The difference between Mohs hardness and hardness is that hardness is expressed in several ways, and Mohs hardness is just one of them.

1.Mohs hardness.

Moss hardness is a scratch that occurs by scratching the surface of the tested mineral by a pyramidal diamond needle, which is customarily used in mineralogy or gemology.

The hardness (scoring method) is expressed by ten grades of the depth of the measured scratches: talc (least hard), gypsum (gypsum) 2, calcite (calcite) 3, fluorite (fluorite) 4, apatite (apatite) 5, orthoclase (feldspar; orthoclase;periclase) 6, quartz (quartz) 7, topaz (topaz) 8, corundum (corundum) 9, diamond (diamond) 10.

2.Hardness.

Hardness is divided into: Scratch hardness. It is mainly used to compare the softness and hardness of different minerals, by selecting a rod with one end hard and one end soft, and the measured material is crossed along the rod, and the softness and hardness of the tested material are determined according to the position of the scratches.

Qualitatively speaking, the scratches from hard objects are long, and the scratches from soft objects are short.

Press-in hardness. It is mainly used for metal materials, and the method is to press the specified indenter into the measured material with a certain load, and compare the softness and hardness of the measured material with the size of the local plastic deformation on the surface of the material. Due to the different indenters, loads and load durations, there are many kinds of indentation hardness, mainly Brinell hardness, Rockwell hardness, Vickers hardness and microhardness.

Rebound hardness. It is mainly used for metal materials, by making a special small hammer fall freely from a certain height to impact the specimen of the tested material, and the hardness of the material is determined by the amount of strain energy stored (and then released) by the specimen during the impact process (determined by the rebound height of the small hammer).

4-7。

Hardness is the ability of a material to resist a hard object pressing into its surface locally. The local resistance of a solid to the invasion of external objects is an indicator of the hardness and softness of various materials. There are different hardness standards due to the different test methods specified.

The mechanical meanings of various hardness standards are different and cannot be directly converted to each other, but they can be compared through experiments.

The hardness of minerals varies.

Hardness refers to the ability of a mineral to resist the ingress of an external mechanical force, such as scoring, pressing, or grinding.

A Mohs hardness tester is usually used as a standard for hardness ratings. The hardness of other minerals is determined by comparing them with standard minerals on the Mohs scale. In field work, it is sometimes not convenient to use the minerals in the Mohs hardness tester as a comparison standard, and the minerals such as nails (2), copper tools (3), and knives (5) are often borrowed instead of standard hardness to help determine the hardness of the identified minerals.

Mohs hardness is a relative hardness that is extremely convenient to apply but coarse. Therefore, it is often necessary to measure the absolute hardness of minerals when studying minerals in detail. The absolute hardness value that is usually used is determined by Vicker using the indentation method and is called Vickers hardness.

The Vickers hardness of the ten minerals of the Mohs hardness tester is as follows (in kg mm2):

Talc 2 Gypsum 35

Calcite 172

Fluorite 248

Apatite 610

Orthoclase 930

Quartz 1120

Topaz 1250

Jadeite 2100

Diamond 10000

There are many kinds of stones, and the hardness of different types of stones is also different.

hardness why stone.

Hello, it is the ability of a rock to resist other objects scratching or pressing its surface, and its unit of measurement is pa (pa) or mpa (megapascal). The strongest and most solid, dense, ductile quartzite, basalt and other rocks that are particularly strong in all kinds of trousers. (f=20)200MPa is very strong and solid granite, quartz porphyry, siliceous schist, more solid quartzite, the most solid sandstone and limestone.

f=15)150 MPa solid and dense granite, very solid sandstone and limestone, quartz veins, solid conglomerate, very strong iron ore. (e.g. pure knowledge f=10) 100 mpa hope my reply can help you, if there is any follow-up slag elimination questions, please ask me, I will reply to your <> as soon as possible

The hardest is talc.

It is a hydrothermal alteration mineral. Magnesium-rich minerals often turn into talc by hydrothermal alteration, so talc often presents mineral artifacts such as olivine, enstatite, hornblende, tremolite, etc. Talc is a common silicate mineral that is very soft and has a slippery feel.

There are 10 minerals that have been chosen to represent 10 levels of hardness, called the Mohs scale, and the first (and the softest) of these 10 levels is talc. Soft talc can be used instead of chalk to draw white marks.

Talc is generally lumpy, rotten, fibrous or radial, white in color, gray-white, and will have various colors due to the presence of other impurities. Talc has many uses, such as refractory materials, fillers for papermaking and rubber, pesticide absorbents, leather coatings, cosmetic materials and carving materials.

Summary. What is the difference between stone hardness and hardness.

I don't understand. Didn't say the point.

And is not the same as hardness.

I don't quite understand what you mean.

Higher hardness. The higher the hardness point, the higher the hardness, right? Yes.