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Mineral Specimen #4282    Fluorite with Included Marcasite, Bitumen on Bottom

Tideswell, Derbyshire, England

Ex.H. R. McBroom, from a trade with Sam Weller, 1987

Mineral specimens from this location are extremely rare. The specimen is likely from one of the old limestone quarries in the area. The Fluorite itself is primarily colorless but is so included with Marcasite crystals it has an overall gray color. The Marcasite is concentrated in zoned layers where it grew upon the surface of the cubic crystals during periods of slower deposition of the Fluorite. The color of the included Marcasite from dark gray to a golden metallic. There is more Marcasite on the surfaces of the cubes which has a more reddish coloration. Due to all of the small Marcasite crystals, the specimen has a great deal of sparkle. Some of the Fluorite near the base of the crystals is a reddish brown to yellow amber color due to iron oxide staining. Of added interest and small rounded blobs of black bitumen on the bottom of the specimen. The specimen is in good condition but there is some chipping on the corners and edges of the cubes.


6.6 x 6.2 x 5.1 cm
largest XL is 18 x 16 x 15 mm

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This mineral is also found in the following galleries: Minerals From Europe | Fluorite | Sulfides and Sulfosalts | Borates and Hydrocarbons | Minerals with Inclusions | Minerals Priced Between 200 and 299 Dollars
This mineral is also found in the following galleries: Minerals From Europe | Fluorite | Sulfides and Sulfosalts | Borates and Hydrocarbons | Minerals with Inclusions | Minerals Priced Between 200 and 299 Dollars