Fluorite

Fluorite crystals, combination of cube and rhombendodecahedron

Origin: La Collada, Asturia, Spain

Picture height: 16 mm

Sample owner: Mr and Mrs. Reiding-Zwart

Photo courtesy of:

Pieter Stemvers, Leusden, Netherlands

email: stemvers@hetnet.nl

Origin: Weardale, Durham, England

Sample size: 3 x 3 x 2 cm with 1 cm crystals

Photo courtesy of:

Tom Loomis

Dakota Matrix Minerals

Red fluorescent fluorite under SW-UV light

Origin: Sonora, Mexico

Owner: Axel Emmermann

Fluorite containg hydrocarbon fluid inclusions (yellow) under LW-UV

Origin: Cave in Rock, Illinois, U.S.A.

Owner: Axel Emmermann

The photo shows two octahedral cleavage fragments of fluorite that exhibit the normal blue fluorescence under LW-UV. The activator that causes the blue fluorescence of the fluorite probably is Europium, as usual. The hydrocarbon does not need an activator since substances like this are often fluorescent in nature

Yttrium-fluorite under SW-UV light

Origin: Hondholmen, Tysfjord, Norway

Owner: Axel Emmermann

The green colour of this specimen is true fluorescence. It must not be mistaken for the greenish reflection that is seen when minerals that contain yttrium are illuminated with an unfiltered mercury-vapor lamp.

Photo courtesy of:

Axel Emmermann

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