Ice (original) (raw)
Colour:
Colourless to white, pale blue to greenish blue in thick layers
Name:
From Old English is, from Proto-Germanic *isa-.
Stable as a solid under 0°C (at standard atmospheric pressure). There are many different structural varieties of ice, although the standard form found on earth is Ih (hexagonal ice) as described here.
It is now confirmed that water ice is also extraterrestrial, occurring on the Moon, Mars and (most likely) Mercury. Long suggested to occur in comets, it was spotted on the surface of the 67P/Churyumov–Gerasimenko comet.
Low-temperature ordering of water in opal into ice-like structure, in particular to its cubic modification, is described by Eckert et al. (2015).
Transparency:
Transparent, Translucent
Colour:
Colourless to white, pale blue to greenish blue in thick layers
Translation gliding:
(0001)
Density:
0.9167 g/cm3 (Measured) 0.93 g/cm3 (Calculated)
Class (H-M):
6/m m m _(_6/_m_2/_m_2/m ) - Dihexagonal Dipyramidal
Cell Parameters:
a = 4.498 Å, c = 7.338 Å
Unit Cell V:
128.57 ų (Calculated from Unit Cell)
Morphology:
Usually as snow crystals, in complex six-rayed stellate forms of great variety, flattened {0001}. Delicate skeletal forms or hopper-shaped prisms as hoar frost. Lathlike crystals, greatly elongated at times, by crystallization on the surface of water.
Twinning:
Twin plane (α): {0001}, and (b): {0001}.
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| ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
|---|---|---|---|---|---|---|---|
| 0016627 | Ice | Peterson S, Levy H (1957) A Single-Crystal Neutron Diffraction Study of Heavy Ice _cod_database_code 1008748 Acta Crystallographica 10 70-76 |  |
1957 | 0 | 293 | |
| 0016628 | Ice | Peterson S, Levy H (1957) A Single-Crystal Neutron Diffraction Study of Heavy Ice _cod_database_code 1008749 Acta Crystallographica 10 70-76 | |
1957 | 0 | 293 | |
| 0018367 | Ice | Kamb B (1964) Ice II: A proton-ordered form of ice Acta Crystallographica 17 1437-1449 | |
1964 | synthetic | 0.3 | 293 |
| 0017930 | Ice | Bernal J, Fowler R (1933) A Theory of Water and Ionic Solution, with Particular Reference to Hydrogen and Hydroxyl Ions _cod_database_code 1011023 Journal of Chemical Physics 1 515-548 | 1933 | 0 | 293 | ||
| 0017962 | Ice | McFarlan R (1936) The Structure of Ice II _cod_database_code 1011063 Journal of Chemical Physics 4 60-64 | 1936 | 0 | 293 | ||
| 0017931 | Ice | McFarlan R (1936) The Structure of Ice III _cod_database_code 1011024 Journal of Chemical Physics 4 253-259 | 1936 | 0 | 293 | ||
| 0018368 | Ice | Engelhardt H, Kamb B (1981) Structure of ice IV, a metastable high-pressure phase Journal of Chemical Physics 75 5887-5899 | 1981 | synthetic | 0 | 110 | |
| 0018366 | Ice | Fortes A D, Wood I G, Grigoriev D, Alfredsson M, Kipfstuhl S, Knight K S, Smith R I (2004) No evidence for large-scale proton ordering in Antarctic ice from powder neutron diffraction Journal of Chemical Physics 120 11376-11379 | 2004 | Kohen Station, Antarctica | 0 | 293 | |
| 0018366 | Ice | Fortes A D, Wood I G, Grigoriev D, Alfredsson M, Kipfstuhl S, Knight K S, Smith R I (2004) No evidence for large-scale proton ordering in Antarctic ice from powder neutron diffraction Journal of Chemical Physics 120 11376-11379 | 2004 | Kohen Station, Antarctica | 0 | 293 | |
| 0018369 | Ice | Kamb B, Davis B L (1964) Ice VII, the densest form of ice Proceedings of the National Academy of Sciences 52 1433-1439 | 1964 | synthetic | 2.5 | 223 | |
| 0015417 | Ice | Kamb B (1965) Structure of ice VI Science 150 205-209 | 1965 | 0 | 293 |
CIF Raw Data - click here to close
- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for references and further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. 
- Good crystals or important locality for species. 
- World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (e.g. from pseudomorphs).
All localities listed without proper references should be considered as questionable.