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Mineralpedia Details for Fluorite

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Fluorite

Fluorite

Named for the composition as bearing fluorite, which in turn receives its name from the Latin ford fluo, meaning “to flow,” in reference to its use in iron smelting to reduce the viscosity of slag. Occurs in a wide range of colors from clear (pure) to most commonly dark to light purple. Uncommonly occurs as light to dark green, yellow, blue (rare) and red (rare). As cleavable, translucent masses to gorgeous cubic and modified cubic crystals micro in size to larger in the centimeter range (1 to 10cm). Usually associated with large Mississippi Valley lead-zinc deposits in Illinois and Kentucky, but also commonly in load vein lead-zince deposits and hydrothermal gold deposits. Alpine cleft deposit as beautiful octahedral red crystals. Fluorite will fluoresce blue, violet, green, yellow, and red, respectively, under ultraviolet light, and can be phosphorescent, thermoluminescent, and triboluminescent.

Ref. Handbook of Mineralogy, Anthony et al (1995) and MSA at http://www.handbookofmineralogy.org/pdfs/fluorite.pdf

Formula
CaF2 
Crystal System
Isometric 
Crystal Habit
Crystalline - Coarse, Massive - Granular, Disseminated 
Cleavage
Three perfect, octahedral cleavages. 
Luster
Vitreous (Glassy) 
Color
purple, clear, yellow, green, red, blue 
Streak
white 
Geological Setting
Occurs in a wide range of geologic environments including low temperature Missississippi Valley lead-zinc deposits, hydrothermal gold deposits, Alpine cleft metamorphic environments  
Class
Isometric - Hexoctahedral 
Fracture
Uneven 
Hardness
WebMineral
View Fluorite 
Mindat
View Fluorite 

Fluorite from Yaogangxian mine, Chenzhou, Hunan prov., China

Fluorite
            from Yaogangxian mine, Chenzhou, Hunan prov., China

Purple to light green cubic crystals from 1 to 5cm with color zoning.

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Fluorite from Judith Lynn claim, Pine Canyon, Grant Co., New Mexico, United States

Fluorite
            from Judith Lynn claim, Pine Canyon, Grant Co., New Mexico, United States

Octahedral crystals to 5mm.

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Fluorite from Wolsendorf dist., Schwandorf, Bavaria, Germany

Fluorite
            from Wolsendorf dist., Schwandorf, Bavaria, Germany

Yellow to golden yellow with purple "inclusions" and crystals to 2cm.

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Fluorite from Rosiclare, Hardin Co., Illinois, United States

Fluorite
            from Rosiclare, Hardin Co., Illinois, United States

Colorful, classic Fluorite specimen from this now defunct locality. This specimen features yellow to dark purple color zonation and has hundreds of Chalcopyrite micro crystal iclusions.

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Fluorite from Berbes, Asturias, Spain

Fluorite
            from Berbes, Asturias, Spain
Special Info
Phillips Collection

Lustrous purple, cubic Fluorite crystals to 1.3cm with showing excellent hoppered growth on the corners of each crystal.

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Fluorite from Elmwood mine, Smith Co., Tennessee, United States

Fluorite
            from Elmwood mine, Smith Co., Tennessee, United States

Light to dark purple cubic Fluorite crystals from 1 to 8cm showing hoppered growth and clear corners. Fluorite from Elmwood is almost always associated with Calcite and/or Sphalerite.

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Fluorite from Henan Province, China

Fluorite
            from Henan Province, China

Spherical purple Fluorite to 6cm.

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Fluorite from Rogerly mine, Durham, England

Fluorite
            from Rogerly mine, Durham, England

Deep green cubic Fluorite with crystals to 3cm on edge.Fluorite from this locality fluoresces a deep purple color.

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Fluorite from Wilberforce, Ontario, Canada

Fluorite
            from Wilberforce, Ontario, Canada

Fine grained quartz in metamorphic matrix.

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Fluorite from Rossport, Ontario, Canada

Fluorite
            from Rossport, Ontario, Canada

Cubic Fluorite to 8mm showing purple zonation along edges and purple cubes to 3mm.

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Fluorite from Silbermühlen mine, Annaberg, Erzgebirge, Saxony, Germany

Fluorite
            from Silbermühlen mine, Annaberg, Erzgebirge, Saxony, Germany

Yellow to golden yellow cubic crystals with reddish-purple zonation onthe crstal edges.

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Fluorite from Deep Portland pit, Wharf mine, Lawrence Co., South Dakota, United States

Fluorite
            from Deep Portland pit, Wharf mine, Lawrence Co., South Dakota, United States

Purple modified cubes of Fluorite to 1.5mm from lower Deadwood Formation.

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FLUORITE from Bluffton Stone quarry, Allen Co., Ohio, United States

FLUORITE
            from Bluffton Stone quarry, Allen Co., Ohio, United States

Clear to light purple Fluorite cubes to 6mm with darker purple internal phantoms along the crystals edges.

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Fluorite from Mapimi dist., Durango, Mexico

Fluorite
            from Mapimi dist., Durango, Mexico

Large purple cubes of Fluorite to 3.5cm. Some of the cubes show octahedral faces.

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Fluorite from Heights mine, Weardale, North Pennines, Co. Durham, England

Fluorite
            from Heights mine, Weardale, North Pennines, Co. Durham, England
Special Info
Fluorescent

Green Fluorite from a classic locality shows good crystals to 1.5cm and strong blue fluorescence, with a number of crystals showing good penetration twins. 

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FLUORITE from St. Agnes, Cornwall, England

FLUORITE
            from St. Agnes, Cornwall, England
Special Info
Antique Specimen

This beautiful specimen of Fluorite is accompanied by both a Fred Canfield and US National Museum tags both of which have individual identification numbers matching the numbers on the mineral (see photos). Canfield donated his collection to the Smithsonian (US National) museum and this specimen is most likely one of those specimens. It's not only an excellent antique mineral specimen but a good one at that with composite Fluorite crystals to 7mm with yellow to colorless cores and purple rims. The matrix appears to be a folded mudstone, perhaps the 'killas' mentioned on pages 4 and 107 of Embrey and Symes (1987). Refer to page 107 for a short discussion of these Fluorites probably from Trevaunance mines.

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Fluorite from Durango mine, Philipsburg dist., Granite Co., Montana, United States

Fluorite
            from Durango mine, Philipsburg dist., Granite Co., Montana, United States

Purple Fluorite, the largest to 5mm, in crevices of limestone lined with light pink Rhodochrosite.

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Fluorite from Tysfjord, Nordland, Norway

Fluorite
            from Tysfjord, Nordland, Norway

Light yellowish crystalline mass with unidentified black stringers.

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Fluorite from Bingham dist., Socorro Co., New Mexico, United States

Fluorite
            from Bingham dist., Socorro Co., New Mexico, United States

Cubic crystals of purple to blue Fluorite showing some color zoning along the edges. Crystal sizes range from 5 to 10mm.

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Fluorite from Weardale, North Pennines, Co. Durham, England

Fluorite
            from Weardale, North Pennines, Co. Durham, England
Special Info
Fluorescent

A fine old cabinet specimen with light purple Fluorite crystals to 2cm, several interpenetrating groups. At the base is a 2.5cm cube of Galena and Siderite is seen as brown rosettes over the entire specimen. It sits and displays nicely. There are a few dings but nothing distracting.

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Fluorite from Ivigtut Cryolite deposit, Ivigtut, Arsuk Fjord, Sermersooq, Greenland

Fluorite
            from Ivigtut Cryolite deposit, Ivigtut, Arsuk Fjord, Sermersooq, Greenland

Red crystals of Fluorite to nearly 2cm in black Cryolite. The specimen is a cut slab and in some of the photos has been wet to show the crystals better.

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Fluorite from Cardiff Uranium mine, Haliburton Co., Ontario, Canada

Fluorite
            from Cardiff Uranium mine, Haliburton Co., Ontario, Canada

Interesting specimen with swirls and bands of dark purple Fluorite and a 8mm Uraninite chunk. 

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Fluorite from Frazers Hush mine, Weardale, Co. Durham, England

Fluorite
            from Frazers Hush mine, Weardale, Co. Durham, England

It is a large cabinet specimen which shows much better in person. The Fluorite crystals  are a light purple and are very glassy and lustrous.

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