Opal
Opal is a hydrated amorphous form of silica (SiO2·nH2O); its water content may range from 3 to 21% by weight, but is usually between 6 and 10%. Due to its amorphous property, it is classified as a mineraloid, unlike crystalline forms of silica, which are considered minerals. It is deposited at a relatively low temperature and may occur in the fissures of almost any kind of rock, being most commonly found with limonite, sandstone, rhyolite, marl, and basalt. The name opal is believed to be derived from the Sanskrit word upala (उपल), which means 'jewel', and later the Greek derivative opállios (ὀπάλλιος), which means 'to see a change in color'. There are two broad classes of opal: precious and common. Precious opal displays play-of-color (iridescence); common opal does not.5 Play-of-color is defined as "a pseudo chromatic optical effect resulting in flashes of colored light from certain minerals, as they are turned in white light."6 The internal structure of precious opal causes it to diffract light, resulting in play-of-color. Depending on the conditions in which it formed, opal may be transparent, translucent, or opaque, and the background color may be white, black, or nearly any color of the visual spectrum. Black opal is considered the rarest, while white, gray, and green opals are the most common.
The Urban Dictionary Mug
I would buy a morbillion of these mugs.

Coffee is good with a banana (minus the Shimflins!)
It was a good gift
AMAZING MUG. Love a good tutti cup in the morning
Great product The mug is of very good quality. Highly recommended!
Guys do i buy a sex mug?
its beautiful. I use this mug every morbing to watch my favorite movie morbius!
EVERY mug I have ordered online through Urban Dictionary has exceeded my expectations! Each (5) is of a very high quality: Clear/Clean printing (ink, color, sharpness, clarity), and Outstanding craftsmanship ("feels" good to hold, and you can tell it "ain't made cheap"). Your company should be proud, indeed.
love it
one tha best mugs i have
My balls are so wet now that I have bought this item. The nut in my butt is boiling
I've had this mug for over a year now and every single day it watches while I shower. It makes me safe sometimes protects me from the voices. Other times I'm lying on the couch watching judge Judy and eating my hot pickles and the mug becomes angry I feel it approaching me with menacing aura. Next thing I know I'm pooing out pieces of ceramic. Overall, its a great mug but only if you can afford multiple colonoscopy's and extremely invasive anal procedures a year. If you have the money for that THIS IS THE MUG FOR YOU.
This mug has given me a new meaning to wake up everyday. I absolutely adore it and I don’t think my life would be the same if this mug did not exist. A gift from God, truly.
What a sexy ass mug ヾ(*’O’*)/
My daughter is a Seinfeld afficianato. She was pleasantly surprised when she opened the package with her Penske File mug. It has the definition of Penske File from the Urban dictionary. Totally worth the price!
gay mug very spicy
The Urban Dictionary is a unique place to find anecdotal memories on all sorts of stuff. Their ongoing communication once your order is placed is excellent. I have put in a significant number of orders recently, and the communication regarding my order status is excellent. I have had one order misplaced in transit. They have contacted me to say that they will get back to me, but to this point, they have not. So, that's a bit of a caveat in my rating. Overall, I would rate their products and customer service as good. I would not hesitate to deal with them in the future. Fill Your Boots with Whatever You Want to Order. Nice job, "Urban Dictionary."
Thank you for sharing this Unique piece of Artwork. You are the only one that offered this. Thank you for the quality service you have provided not only in what you offer but right on to the quality packaging as well. Thanks again - Peggy Hall
My brother Tom became an uncle & urban dictionary created a wonderful uncle Tom mug…
It is special to have a mug that has to do with my dad who invented a word when we were growing up. He passed away last year. Drinking from this mug is like spending time with him.
Review Details
Pro Customization
Create unique products with your own words and definitions
Live Preview
Personalize Your Design
Debug: Product Metadata
| Key | Value (click to copy) |
|---|---|
Copied! | copiedKey = null, 1500);
"> |
Return Policy
Made Just For You
Each product is custom-printed with your unique text, making it truly one-of-a-kind.
Defect-Free Guarantee
If your product arrives with printing defects, damage, or quality issues, we'll send you a free replacement.
Custom Orders
Due to the personalized nature of your order, we don't accept returns for change of mind or sizing issues.
Questions about your order? Contact our support team for assistance.