Anyone help with that https://youtu.be/y5zNZre36k After you watch the small vide

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Anyone help with that https://youtu.be/y5zNZre36k
After you watch the small video just answer this question if u can and please if u can type it I mean no handwriting because I cannot understand
https://youtu.be/y5zNZre36k8

a. Make a sketch showing the outline of two crystals from each compound. b. Which compounds have isometric (cubic) form? c. Why is it that not all of the crystals are perfect cubes? d. Do the crystals of each compound satisfy the law of constance of interfacial angles? e. Does each compound have a unique crystal form? f. Can minerals be identified from crystal form alone?


Anyone help with that https://youtu.be/y5zNZre36k
After you watch the small video just answer this question if u can and please if u can type it I mean no handwriting because I cannot understand
https://youtu.be/y5zNZre36k8

a. Make a sketch showing the outline of two crystals from each compound. b. Which compounds have isometric (cubic) form? c. Why is it that not all of the crystals are perfect cubes? d. Do the crystals of each compound satisfy the law of constance of interfacial angles? e. Does each compound have a unique crystal form? f. Can minerals be identified from crystal form alone?


Anyone help with that
After you watch the small video just answer this question if u can and please if u can type it I mean no handwriting because I cannot understand
https://youtu.be/y5zNZre36k8

a. Make a sketch showing the outline of two crystals from each compound. b. Which compounds have isometric (cubic) form? c. Why is it that not all of the crystals are perfect cubes? d. Do the crystals of each compound satisfy the law of constance of interfacial angles? e. Does each compound have a unique crystal form? f. Can minerals be identified from crystal form alone?
a. Make a sketch showing the outline of two crystals from each compound. b. Which compounds have isometric (cubic) form? c. Why is it that not all of the crystals are perfect cubes? d. Do the crystals of each compound satisfy the law of constance of interfacial angles? e. Does each compound have a unique crystal form? f. Can minerals be identified from crystal form alone?

Explanation / Answer

b) according to the definition isometric cubic form means unit cells have cubic structure. From the video its clear the covering one has the isometric structure (cubic).

c) The shape of a crystal is dependent on the crystal growth rate and internal symmetry. In case of cubic structure , thhe internal atomic arrangement or the lattice symmetrically grow along the three axies. But in some imperfect environment the groth rate may be faster/slower along a paticular axis and the same changes internal lattice symmetry and gives the crystal non-cubic structure

d) The law of constance or Steno's law holds for any two crystals irrespective of its size or occurance. Even after breaking (cleavage planes) the angles between faces remain the same.

e) There are two basic types of compounds; molecular compounds are made of non-metals and bond structures are covalent (H2O,CH4) but ionic compounds use ionic bond and they form the lattic structure perfectly therefore ionic compounds are best for crystaline structure

f) According to Dana and Struntz classification minerals are identified by its chemical composition and crystal structure. Therefore occurence, stability, abiogenic nature are also important factors in identification. So crystal structure cannot alone determine the mineral

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