A gas is more compressible.
minerals
Certain substances will split a ray of light into two slightly different paths by polarisation. If a crystal transmits light without splitting it in this way when the light is incident on the crystal in only one direction then the crystal is said to be uniaxial. If light is transmitted when it is incident in either of two directions then the crystal is said to be biaxial. Please see the links.
Crystals come in different shapes, determined by how the molecules of compounds from which they are made can be packed together. For instance a quarts crystal is hexagonal in shape, while galena and pyrites crystals are cubic. There are six different crystal shapes or forms determined by the axes and degree of symmetry of the crystal and the angles at which the axes intersect. Subordinate to the overall crystal shapes, many crystalline substances have within them planes of weakness along which the crystal may break these lines are related to the crystals symmetry and caused by how the molecules are aligned within the crystal. This is cleavage.
Hg is the only liquid metal at room temperature, melting point 234.32 K, (-38.83 °C, -37.89 °F)Together with Bromine it is one of the only two liquid elements, all others are solid and only some (11) are gaseous.
ionic crystal
a red crystal
minerals
This depends on: volume of water, temperature of water, stirring, crystal dimensions, presence of other substances etc.
All ionic substances are indeed ionic, that is to say that contain positively charged cations and negatively charged anions. All ionic substances crystallize into small crystal when they are in their solid form
Minerals crystal habit, cleavage, hardness, color and luster are the properties that distinguish minerals from other substances.
Crystal
physical change as no new substances have been created
A diamond is one form of carbon crystal. However many other substances form crystals under the right conditions. Sugar, salt and emeralds are all examples. So, a diamond is a crystal, but a crystal doesn't have to be a diamond.
Certain substances will split a ray of light into two slightly different paths by polarisation. If a crystal transmits light without splitting it in this way when the light is incident on the crystal in only one direction then the crystal is said to be uniaxial. If light is transmitted when it is incident in either of two directions then the crystal is said to be biaxial. Please see the links.
All of them can form organized crystal lattices.
Mineraloids are mineral like substances that do not have a crystalline structure. Mercury is an example.
Crystals come in different shapes, determined by how the molecules of compounds from which they are made can be packed together. For instance a quarts crystal is hexagonal in shape, while galena and pyrites crystals are cubic. There are six different crystal shapes or forms determined by the axes and degree of symmetry of the crystal and the angles at which the axes intersect. Subordinate to the overall crystal shapes, many crystalline substances have within them planes of weakness along which the crystal may break these lines are related to the crystals symmetry and caused by how the molecules are aligned within the crystal. This is cleavage.