bb: Opalized Limestone - Multicolor Fluorescent from Wyoming!

Description

NOTE:
Postal delays caused by the pandemic are affecting
delivery of parcels. In the USA, most delays are minimal. Shipping to other countries is currently taking at least several days to a week or more longer than usual. Please keep this in mind while bidding.
Species:
Opal var. common opal, Chalcedony, possible Calcite & Fluorite replacing limestone
Locality
: Sweetwater County, Wyoming
Size:
Miniature
-
4.5 x 3.9 x 2.2 cm
Weight:
30.7 g
Number:
2483
Details:
From Sweetwater County in Wyoming, this specimen does a great Jekyll & Hyde transformation from daylight to UV. From unassuming brownish gray, it changes to green, blue and white under longwave and then goes all crazy chartreuse under shortwave. It started as impure limestone before being altered by an acidic silica solution that was loaded with fluorescent ions like uranium, plus some fluorine.
It was collected years ago by a Western fluorescent specialist I met at a swap in Colorado; I'm almost out of it
now
.
Very cool!
NOTE: TO VIEW FLUORESCENCE, YOU NEED A QUALITY ULTRAVIOLET LIGHT WITH A UV FILTER!
The better the UV source, the better fluorescent minerals look. Cheap "UV" flashlights without filters will not provide satisfactory results!
The photos here are taken using Convoy S2 and C8 (longwave-365)
and UV Systems SuperBright II (shortwave-254) lamps, metered
and exposed to show fluorescent response to best advantage.
Key factors include lamp wattage, UV spectrum and filtration, as well as distance from lamp to specimen. For best results with any UV source, observe against a dark, non-fluorescent, non-reflective background, in complete darkness with eyes adapted. For extended viewing, use protective UV-absorbing goggles.
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INTERNATIONAL CUSTOMERS:
* US Post Office policy can make economical shipping a challenge. Price increments for packages are as follows:
First class up to 225 g, then 225-900 g, then 900-1350 g (Canada only).
Higher weights require Priority Mail.
I always try to make shipping as cost-effective as possible. Please send a message so we can work things out.
* Please note that import duties, taxes or charges are not included in the item price or shipping fees and are the
buyer’s
responsibility.
While most countries do not charge duty on mineral specimens, you should check in
your own co
untry to be sure before bidding.