What causes this circular rainbow pattern in white light?

2021.10.21 17:44 asymptotically What causes this circular rainbow pattern in white light?

What causes this circular rainbow pattern in white light? My friend gave me this coffee grinder, and I noticed that the flat glass piece on top gives a rainbow pattern in white light - it doesn't happen in sunlight or even my warm lamps. This is the glass with a white computer screen shining on it.
What's causing it? What does it say about how the glass was made?
https://preview.redd.it/z8dm8u8o7vu71.jpg?width=2052&format=pjpg&auto=webp&s=24b4fe315556f3239d0f1dce833e346f7827432a
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2021.10.21 17:44 calmerpoleece Victoria AMA says Covid-deniers and anti-vaxxers should opt out of public health system and ‘let nature run its course’

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2021.10.21 17:44 AutoNewspaperAdmin [Local] - The California ShakeOut is just a drill. Are you ready for a real earthquake? | LA Times

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2021.10.21 17:44 Kassius-Phantom DAMN ! This game is so freaking awesome !!

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2021.10.21 17:44 FruitLuper My pup somehow got only her lower jaw out of her cone of shame. 🤣 don’t worry she’s ok, just a huge doofus (originally posted in r/eyebleach but thought it belonged here too)

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2021.10.21 17:44 tzc005 Barcode printer for asset management

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2021.10.21 17:44 ob-2-kenobi Skyrim was released 11/11/11 so I'm pretty sure my car can kill dragons now?

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2021.10.21 17:44 -Captp- Face à la hausse des prix de l’énergie et des carburants, Jean Castex annonce une « indemnité inflation » de 100 euros

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2021.10.21 17:44 klingonbussy Countries where I've taken a shit

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2021.10.21 17:44 Inazuma_Tdf i have never watched or played inazuma eleven

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2021.10.21 17:44 AbolethFucker What exactly does 'sentient' mean in the text?

There's been some dispute over this at our table, for a variety of reasons I won't get into. I interpret it, based on the context it's used in, as any sort of creature that can do the same sort of thinking a human can do. Another player, however, interprets it as anything with a mind - humans, dogs, bugs, etc.
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2021.10.21 17:44 tides___ this is a test

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2021.10.21 17:44 calculatethepattern My take on The Shire with Hobbit Homes 🌳 (creative mode)

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2021.10.21 17:44 HooniganBoy 🚨Giveaway alert 🚨 Giving 1 collectable upvote ,favourite and comment your Address and Instagram id.

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2021.10.21 17:44 Bearsy11 Serious question- Can someone please explain to me where Hillary is being bullied? I thought she turned comments off on her Instagram posts

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2021.10.21 17:44 TheInvincibleBalloon Chevy will be replacing my battery within the next week or two.

Just heard from Chevy concierge. The dealership is receiving their hoist within the next two days, repairs start within a week.
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2021.10.21 17:44 food-head Hot 'n' Spicy Vegan Fritters - Veggie Patties

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2021.10.21 17:44 PhilosophyDirect2129 Lawsuit alleges UPMC is refusing to provide medical exemptions for school mask mandate

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2021.10.21 17:44 eknight12 Question on triangulation

Is it mathematically possible to know 2 given points on a plane without being able to triangulate the 3rd point? Thanks in advance.
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2021.10.21 17:44 SCESG400 Anyone with PS4 wanna play?….?

Games I currently enjoy playing
-Xenoverse 2 - Dead by Daylight - Friday The 13th - Shinobi Striker - The Forest - BO3 Zombies - Minecraft
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2021.10.21 17:44 9ice____ Crypto Payments

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2021.10.21 17:44 Kooky-Sea4754 This guy is both cute and terrifying, anyone know where he's from?

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2021.10.21 17:44 Zennred Evelyn West

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2021.10.21 17:44 Campolucci7 Vediamo se resisti

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2021.10.21 17:44 SpiralBarrage Which of Ash's Pokemon do you think is criminally underrated, and which ones do you find are extremely overrated.

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