opal
silica mineraloid
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Summary
opal is a mineral species[1]. opal ranks in the top 0.21% of mineral species entities by monthly Wikipedia readership (13,715 views/month, #3 of 1,431).[2]
Key Facts
- Chemical formula: SiO₂·nH₂O[3]
- Subclass of: mineraloid[4], dioxosilicate minerals (silica family)[5], tectosilicates[6]
- Commons category: Opal[7]
- Streak color: white[8]
- IMA status and/or rank: grandfathered mineral (G)[9]
- Strunz 8th edition (series ID, updated): IV/D.01c[10]
- Nickel-Strunz 9th edition (updated 2009): 4.DA.10[11]
- Nickel-Strunz '10th ed', review of (9th ed/ 2009 update): 4.DA.10[12]
- Topic's main category: Category:Opals[13]
- Commons gallery: Opal[14]
- Described at URL: https://hedendaagsesieraden.nl/2023/04/10/opaal/[15]
- Described by source: Great Soviet Encyclopedia (1926–1947)[16], Explanatory Dictionary of the Living Great Russian Language[17], Brockhaus and Efron Encyclopedic Dictionary[18], Small Brockhaus and Efron Encyclopedic Dictionary[19], New Encyclopedic Dictionary[20], The Nuttall Encyclopædia[21], Encyclopædia Britannica 11th edition[22], hedendaagsesieraden.nl[23]
- Different from: Opal[24], Opale[25]
- Maintained by WikiProject: WikiProject Gemstones[26], WikiProject Gemology and Jewelry[27], WikiProject Rocks and minerals[28], WikiProject Visual arts[29]
- IMA Mineral Symbol: Opl[30]
- P14541: W9azG[31]
Body
Works and Contributions
Things named for opal include Opale[32], a submarine[33], in France[34].
Why It Matters
opal has Wikipedia articles in 30 language editions, a strong signal of global cultural recognition.[35] opal is known by 56 alternative names across languages and contexts.[36]
Entities named for opal include Opale[32], a submarine[33], in France[34].