| Ⅰ N Needle crystals | 1. Simple needle | a. Elementary needle |  |
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| b. Bundle of elementary needles |  |
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| 2. Combination |  |
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| Ⅱ Ｃ Columnar crystal | 1. Simple column | a. Pyramid, Bullet type |  |
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| b. Hexagonal column |  |
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| 2. Combination | a. Combination of bullets |  |
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| b. Combination of columns |  |
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| Ⅲ P Plane crystal | 1. Regular crystal developed in one plane |
a. Symple plate |  |
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| b. Blanches in sector form |  |
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| c. Plate with simple extensions |  |
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| d. Broad branches |  |
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| e. Simple stellar form |  |
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| f. Ordinary dendritic form |  |
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| g. Fernlike crystal |  |
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| h. Stellar crystal with plates at ends |  |
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| i. Plate with dendritic extensions |  |
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| 2. Crystal with irregular number of branches |
a. Three-branched crystal |  |
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| b. Four-branched crystal |  |
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| c. Others |  |
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| 3. Crystal with twelve branches |
a. Fernlike crystal |  |
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| b. Broad branches |  |
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| 4. Malformed crystal | Many varieties |  |
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| 5. Spacial assemblage of plane branches |
a. Special hexagonal type |  |
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| b. Radiating type |  |
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| Ⅳ CP Combination of column and plane crystals |
1. Column with plane crystals at both ends |
a. Column with plates |  |
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| b. Column with dendritic crystal |  |
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| c. Complicated capped column |  |
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| 2. Bullets with plane crystals |
a. Bullets with plates |  |
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| b. Bullets with dendritic crystals |  |
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| 3. Irregular assemblage of columns and plates |  |
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| Ⅴ S Columnar crystals with extended side planes |  |
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| Ⅵ R Rimed crystals (crystals with cloud particles attathed ) |
1. Rimed crystal |  |
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| 2. Thick plate |  |
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| 3. Graupellike snow | a. Hexagonal type |  |
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| b. Lump type |  |
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| 4. Graupel | a. Hexagonal graupel |  |
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| b. Lump graupel |  |
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| c. Conelike graupel |  |
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| Ⅶ I Irregular snow particle |
1. Ice particle |  |
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| 2. Rimed particle |  |
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| 3. Miscellaneous | |||||