Quartz or other mineral to which a thin film of gold has been applied, giving it a blue iridescent colour.
镀金石英（呈彩虹色）
Example sentencesExamples
I also want some aqua aura as I'm drawn to it every time I see it, and some opal aura, I've only seen it once but I really liked it.
Aqua aura is quartz that has been specially treated with pure 24k gold which turns the clear quartz crystal this stunning blue iridescent color.
I'd love to buy him some aqua aura but the bank balance won't go that far!
Types will vary from time to time and may include quartz crystal, amethyst, rose quartz, aqua aura, and others.
From memory I was using a 1kg bag of gem grade rose quartz, a dakini stone, a lump of smoky quartz, a shiva lingham, some aqua-aura, 9 lumps of black tourmaline (in a wheel!) and about 20 other bits and bobs on the shelf (including some fair sized chunks of clear quartz) that were obviously contributing to the affair.
Origin
1990s: from Latin aqua 'water' + aura, representing Latin aurum 'gold'.