{
  "name": "Bench card: snow crystal (ice Ih)",
  "desc": "Bench card values for a snow crystal of ice Ih: name, formula, PubChem CID, lattice and shape, size, where it is found and the key source",
  "lic": "CC BY 4.0",
  "lic_url": "https://creativecommons.org/licenses/by/4.0/",
  "by": "Ants, Cells & Atoms",
  "url": "https://antscellsandatoms.com/molecules/snowflakes/",
  "from": [
    "values typed from the sources listed in data_credit; four hydrogen bonds per molecule counted from the bonding described in Libbrecht 2019, section 2.2 (same count as the shared file ice-lattice.csv); formula and CID as in the shared file molecule-identity.csv"
  ],
  "how": "Compiled by Ants, Cells & Atoms from the data listed",
  "data_by": [
    "Wikidata Q283 (formula P274, PubChem CID P662), CC0, retrieved 2026-10-25",
    "Lattice, facets, sizes and occurrence: Libbrecht KG, Snow Crystals, monograph, arXiv 1910.06389 v2 (2021), https://arxiv.org/abs/1910.06389, retrieved 2026-10-24",
    "Four hydrogen bonds per molecule: computed 2026-10-25 from the bonding described in Libbrecht KG, Snow Crystals, monograph, arXiv 1910.06389 v2 (2021), https://arxiv.org/abs/1910.06389, section 2.2 (two tight and two weaker O–H bonds on each oxygen)"
  ]
}