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Opal doesn't have a crystal shape, it's amorphous.
There are a couple examples. Coal is a rock, but it is organic and so does not contain minerals. Obsidian and pumice are both varieties of volcanic glass. Since they lack a crystal structure, they are not composed of minerals
TiSi2 - orthorombic crystal structure
The crystal structure of phosphorous is monoclinic.
Yes, the mineral malachite does have a crystal structure.
No. Coal is not a mineral for two reasons: it lacks a crystal structure and it is organic.
Sodium's crystal structure is cubic.
Opal doesn't have a crystal shape, it's amorphous.
Americium crystal has a hexagonal type crystalization.
Argon has a face-centered cubic structure.
crystal structure
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Coal does not have a crystalline structure, crystalline structures are only caused when and untainted sample solidifies from another state, coal is caused by pressure and heat applied over thousands of years to dead animals, as a result it contains high levels of impurities and has a very unpredictable and random structure.
Both coal and graphite are made of carbon, but in different molecular structures. Diamond is also made of carbon but in a highly ordered crystal structure.
No coal is a type of carbon structure. Just like graphite, buckeyballs and diamonds.
There are several types of bonds that can have a crystallized structure. These include ionic bonds, covalent bonds, and metallic bonds. The crystal structure is an arrangement of atoms and molecules.
The internal arrangement of atoms.