Description
 21.13 cts of Transparent Clear Fluorite Crystal Specimen
Colorless Fluorite Crystal-Specimens
Shades of transparent clear, Specimen from China, Nice luminescent property
Dealer Offering Item for Sale: New Directions Fluorite Specifications: - Gem Species: Fluorite
- Hardness: 4
- Density: 3.175
- RI: 1.434
Cut: SpecimensCalibrated Gemstone: Yes Carat Weight: 21.125 Carats AveGrade: None
Clarity Breakdown: Natural crystal structure, no cutting, not uniform sizes, and is generally crystalline in nature.Cutting Breakdown: Natural - No Cut as it comes from the GroundCarat Breakdown: Average in Carat Weight for this size stone (+/- 5%)Photo Clarity Breakdown: Color is Excellent, Image is Sharp, & Background is Close to True.Photo shows Multiple views of Multiple Specimen Pricing based on a single SpecimenPhoto show the variation in stones.
Fluorite is a mineral with a veritable bouquet of brilliant colors. Fluorite is well known and prized for its glassy luster and rich variety of colors. The range of common colors for fluorite starting from the hallmark color purple, then blue, green, yellow, colorless, brown, pink, black and reddish orange is amazing and is only rivaled in color range by quartz. Intermediate pastels between the previously mentioned colors are also possible. It is easy to see why fluorite earns the reputation as "The Most Colorful Mineral in the World".Fluorite is found as a common gangue mineral in hydrothermal veins, especially those containing lead and zinc minerals. It is also found in some greisens, granites, pegmatites and high-temperature veins, and as a component of some marbles and other metamorphic rocks. Has a zonal or spotty distribution of color, Hvitreous luster, Has unique luminescent property.To top it all off, fluorite is frequently fluorescent and, like its normal light colors, its fluorescent colors are extremely variable. Typically it fluoresces blue but other fluorescent colors include yellow, green, red, white and purple. Some specimens have the added effect of simultaniously having a different color under longwave UV light from its color under shortwave UV light. And some will even demonstrate phosphorescence in a third color! That's four possible color luminescence in one specimen! If you count the normal light color too. The blue fluorescence has been attributed to the presence of europium ions (Eu +2). Yttrium is the activator for the yellow fluorescence. Green and red fluorescent activation is not exactly pinned down as of yet, but may be due to the elements already mentioned as well as other rare earth metals; also manganese, uranium or a combination of these. Even unbonded fluorine trapped in the structure has been suggested. The word fluorescent was derived from fluorite since specimens of fluorite were some of the first fluorescent specimens ever studied.
