The crystal density is 2.65g/cm3. Density (specific gravity SG): 2.66 (0.03, 0.02) g/cm3.

This means that the weight of a certain volume of crystals is 2.56-2.66 times that of the same volume of water. Bulk crystals may have a slightly higher density. Colorless crystal and colorless feldspar are very close in refractive index and density, so it is difficult to distinguish them.

The main method is to enlarge the inspection. Feldspar has two sets of perfect cleavage. Under the microscope, it can be seen that the two sets of cleavage intersect to form an "entertaining clam-like" inclusion or a thin and straight structure, while the crystal has no cleavage development and can only see intermittent and irregular cleavage.

2. diamonds

Density (g/mlat 25 C): 3.5, mineral brittle, shell-like or hackly fracture, which will crack along the crystal cleavage plane under small impact, medium or perfect cleavage parallel to octahedron, but not perfect cleavage parallel to dodecahedron. The minerals are relatively pure, and the density is generally 3470-3560kg/m3.

3. Glass

The main component of glass is also silicon dioxide, but it is not a crystal, but a mixture with uncertain density. The density of glass is calculated as (2.4~2.8)× 10? .

Extended data:

Density characteristics—

Density reflects a characteristic of matter itself, so it will be influenced by external factors. Generally speaking, the main physical quantities that affect the density of matter are pressure and temperature. ?

If the density of a diamond is found to be less than the standard value during identification, then the diamond may be a fake. Generally speaking, if the density of a diamond cannot be determined well, it can be identified by carving it gently. If a pen can draw a continuous straight line on the surface of a diamond, then the diamond is probably not fake.

Compared with other jewelry, diamond has a high density, but although it is hard, it also has great brittleness, and it will be easily broken when it is hit by hard objects.

Therefore, we should pay attention to the maintenance of diamonds in our daily life. For example, when carrying heavy objects or doing some rough work, we should try to take off the jewelry inlaid with diamonds to avoid scratches in ordinary bumps and try not to let diamonds fall to the ground. The density of diamonds is relatively high, but they will be eclipsed if they are not cared for.

References:

Baidu encyclopedia-density table

References:

Baidu encyclopedia-crystal

References:

Baidu encyclopedia-diamond