Analyze these two photomicrographs of ice crystals (snowflakes) by William Bentl
ID: 231659 • Letter: A
Question
Analyze these two photomicrographs of ice crystals (snowflakes) by William Bentley. Based on FIGURE 4. what is the crystal form of the top crystal? Notice that the crystals arc symmetrical, but not exactly. Imperfections arc common in crystals, but their underlying crystal form can still be detected. To what crystal system in FIGURE 5 do ice crystals belong? How can you tell? REFLECT & DISCUSS The habit of snowflakes (crystals of water ice) includes a variety of different crystal forms. Why don't all snowflakes have the same crystal form Analyze each crystalline household material pictured below and identify which crystal system it belongs to. (Use a hand lens or microscope to observe actual samples of the materials if they are available.) Sucrose (table sugar) belongs to the crystal system. Sucrose (table sugar) belongs to the How can you tell?Explanation / Answer
K)
Succrose belongs to Monoclinic crystal system. Monoclinic has a shape of right prism which parallelogram bases resembles the sucrose crystals.
Epsomite belongs to orthorombic crystal system where the all of the three crystallographic axes are not equal and angle between them is 90°
Halite belongs to cubic crystal system where all the three axes are equal and angles betwwn them is 90°.
According to the defination of mineral " It should be naturally occuring, inorganic solid with definate crystal structure with fixed chemical composition". Even though sucrose has definate crystal structure but it is not inorganic solid. Thus sucrose is not a mineral.