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Let's Rock => Rock Talk => Topic started by: R.U. Sirius on May 02, 2023, 09:29:06 PM

Title: Stones that bleach in the sun
Post by: R.U. Sirius on May 02, 2023, 09:29:06 PM

I'd like to put together a list here of stones that permanently change color when exposed to strong light. Please comment with any additions or corrections, and I will update the list.

• Rose quartz - fades in sunlight
• Amethyst - fades in sunlight
• Vivianite - darkens and deteriorates
• some fluorites (which ones?) fade in sunlight
• some fluoroapatites (which ones?) fade in sunlight
• lepidolite turns brown
• thulite goes from pink to orange

Title: Re: Stones that bleach in the sun
Post by: lithicbeads on May 03, 2023, 11:17:19 AM

Add lepidolite which turns brown and thulite which goes from pink to orange.

Title: Re: Stones that bleach in the sun
Post by: R.U. Sirius on May 03, 2023, 04:19:23 PM

After some digging around, I found this discussion (https://www.mindat.org/mesg-115692.html) on Mindat where someone already compiled the list (scroll down the linked page to see it).
 Curiously, lepidolite and thulite are not there!

Title: Re: Stones that bleach in the sun
Post by: lithicbeads on May 04, 2023, 03:46:59 PM

Those two I have experience with.