SiO₂·nH₂O (P274)
| P373 | Commons category | String | Opal | ??? |
| P935 | Commons gallery | String | Opal | ??? |
| P556 | crystal system | ... | Q103382 (amorphous solid) | amorphous solid |
| P973 | described at URL | Url | None | ??? |
| P1343 | described by source | ... | Q602358 (Brockhaus and Efron Encyclopedic Dictionary) | Brockhaus and Efron Encyclopedic Dictionary |
| P1343 | described by source | ... | Q867541 (Encyclopædia Britannica 11th edition) | Encyclopædia Britannica 11th edition |
| P1343 | described by source | ... | Q1970746 (Explanatory Dictionary of the Living Great Russian Language) | Explanatory Dictionary of the Living Great Russian Language |
| P1343 | described by source | ... | Q3181656 (The Nuttall Encyclopædia) | The Nuttall Encyclopædia |
| P1343 | described by source | ... | Q19180675 (Small Brockhaus and Efron Encyclopedic Dictionary) | Small Brockhaus and Efron Encyclopedic Dictionary |
| P1343 | described by source | ... | Q19190511 (New Encyclopedic Dictionary) | New Encyclopedic Dictionary |
| P1343 | described by source | ... | Q20078554 (Great Soviet Encyclopedia (1926–1947)) | Great Soviet Encyclopedia (1926–1947) |
| P1343 | described by source | ... | Q89929597 (hedendaagsesieraden.nl) | hedendaagsesieraden.nl |
| P1889 | different from | ... | Q413190 (Opal) | Opal |
| P1889 | different from | ... | Q3353039 (Opale) | Opale |
| P10113 | IMA Mineral Symbol | String | Opl | ??? |
| P579 | IMA status and/or rank | ... | Q13406846 (grandfathered mineral (G)) | grandfathered mineral (G) |
| P31 | instance of | ... | Q12089225 (mineral species) | mineral species |
| P138 | named after | ... | Q83437 (gemstone) | gemstone |
| P713 | Nickel-Strunz '10th ed', review of (9th ed/ 2009 update) | String | 4.DA.10 | ??? |
| P712 | Nickel-Strunz 9th edition (updated 2009) | String | 4.DA.10 | ??? |
| P534 | streak color | ... | Q23444 (white) | white |
| P711 | Strunz 8th edition (series ID, updated) | String | IV/D.01c | ??? |
| P279 | subclass of | ... | Q1277475 (tectosilicates) | tectosilicates |
| P279 | subclass of | ... | Q12550001 (dioxosilicate minerals (silica family)) | dioxosilicate minerals (silica family) |
| P910 | topic's main category | ... | Q25324634 (Category:Opals) | Category:Opals |
| P1014 | Art & Architecture Thesaurus ID | 300011129 |
| P714 | Dana 8th edition | 75.2.1.1 |
| P1900 | EAGLE id | material/lod/96 |
| P10565 | Encyclopedia of China (Third Edition) ID | 55423 |
| P1417 | Encyclopædia Britannica Online ID | topic/opal |
| P3219 | Encyclopædia Universalis ID | opale |
| P646 | Freebase ID | /m/0f7cb |
| P227 | GND ID | 4172602-9 |
| P4342 | Great Norwegian Encyclopedia ID | opal |
| P11514 | Great Russian Encyclopedia portal ID | opal-ee8a04 |
| P8406 | Grove Art Online ID | T2073307 |
| P3827 | JSTOR topic ID (archived) | opal |
| P8408 | KBpedia ID | Opal-Gem |
| P7348 | Kivid.info ID | 606 |
| P6385 | Krugosvet article (archived) | Earth_sciences/geologiya/OPAL.html |
| P244 | Library of Congress authority ID | sh85094861 |
| P6263 | Mindat mineral ID | 3004 |
| P12070 | Minerals.net mineral and gemstone ID | gemstone/opal_gemstone |
| P12070 | Minerals.net mineral and gemstone ID | mineral/opal |
| P12596 | museum-digital tag ID | 36372 |
| P9495 | National Historical Museums of Sweden ID | term/BC92EB47-BF56-43BB-A475-E67ABF7C1896 |
| P8189 | National Library of Israel J9U ID | 987007545899905171 |
| P349 | NDL Authority ID | 00568903 |
| P691 | NL CR AUT ID | ph433469 |
| P1245 | OmegaWiki Defined Meaning | 1108110 |
| P4212 | PACTOLS thesaurus ID | pcrtjyrVAHv1m8 |
| P10890 | PM20 ware ID | 143630 |
| P10077 | Spanish Cultural Heritage thesauri ID | materias/1001047 |
| P12800 | Vikidia article ID | fr:Opale |
| P8814 | WordNet 3.1 Synset ID | 14712395-n |
| P13591 | Yale LUX ID | concept/c0c4095a-5f18-48c4-938f-b19d830ac153 |
| P2347 | YSO ID | 26130 |
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