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Phases of Ice Quiz

Sorce is the wikipedia article "Phases of ice"
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Last updated: May 21, 2026
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First submittedMay 21, 2026
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Year Discovered
Crystal form
(Stability) Temperature
Pressure
Phase
N/A
Hexagonal
0°C
Atmospheric
Ih
1900
Rhombohedral
-196.2°C
300MPa
Ice II
1900
Tetragonal
-196.2°C
300MPa
Ice III
1900
Rhombohedral
-196.2°C
810MPa
Ice IV
1900s
Monoclinic
-20°C
500MPa
Ice V
1912
Tetragonal
-143 to 82°C
1.1GPa
Ice VI
1930s
Amorphous
N/A
Atmospheric or lower
Low-Density Amorphous
1937
Cubic
82°C
2.2GPa
Ice VII
1943
Diamond Cubic
-143 to -53°C
Atmospheric
Ic
1966
Tetragonal
5°C
2.1GPa
Ice VIII
1968
Tetragonal
-133°C
200 to 400MPa
Ice IX
1972
Orthorhombic
-201.2°C
N/A
Ice XI
1984
Amorphous
-196.2°C
1.6GPa
High-Density Amorphous
1996
Tetragonal
-13°C
0.55GPa
Ice XII
1996
Amorphous
-196.2°C
2GPa
Very High-Density Amorphous
2006
Monoclinic
-143°C
500MPa
Ice XIII
2006
Orthorhombic
<-133°C
1.2GPa
Ice XIV
2009
N/A
-193.2°C to -165°C
1.1GPa
Ice XV
2014
N/A
<-133°C
1.2GPa
Ice XVI
2014
Square
<-133°C
1.2GPa
Square
2016
Hexagonal
<-133°C
1.2GPa
Ice XVII
2018
N/A
<-173°C
2GPa
Ice XIX
2019
N/A
N/A
N/A
Ice XVIII
2021
Cubic
627 to 1527°C
20 to 60GPa
Ice XX
2022
Cubic
<-133°C
30 to 70GPa
Ice X
2023
Amorphous
-200°C
N/A; requires shear force
Medium-Density Amorphous
2025
Cubic
>196.9°C
>4GPa
Plastic Ice VII
2025
Tetragonal
24.9°C
1.6GPa
Ice XXI
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