Douglas Adams goes up to the counter and orders an Earl Grey. The barista turns a handle, and there is a whirring that fills the entire coffee shop, followed by the screech of fingernails on a blackboard and something that sounds suspiciously like the theme from Scooby Doo. It is the barista’s first day, and she has already been mistaken once for a barrister and once for J.S. Bach, so she (quite bravely) accepts that maybe strange things just happen in this particular Starbucks. A mucusy batter flows reluctantly from the faucet, which was meant only to supply hot water. She shrugs, and hands it to Adams. He shrugs, and drinks it.
This is Alexandrite, it’s also called “emerald by day, ruby by night”
It changes colour based on whether the light source is from the sun or from a candle.
It does this because Alexandrite strongly absorbs yellow light due to chromium ions in its crystal structure, leaving the other colours behind. Light from the Sun emits all colours, but it peaks in the green, and our eyes are most sensitive to green, so in Sunlight Alexandrite is green.
Incandescent lights are things like candles and filament light bulbs. They also emit all colours of light, but they peak far, far into the red, so there’s not nearly as much green or blue, so under those, Alexandrite is red.
Gemstones are awesome.
Yo forget diamonds, gimmie THIS as a wedding ring.
This is awesome, this is my birth stone and I never knew it did this! most of the time it just looks kinda grey-purple. Now I want more stuff with my birthstone in it!
The little male African black-footed cat kitten (Felis nigripes), at the EFBC’s Feline Conservation Center, is now 6 weeks old, and very curious. Mom Gabby enforced a 3 foot separation when he tried to check out the camerawoman.