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Fluorapatite with Sphalerite

#PD30910

Fluorapatite with Sphalerite

#PD30910
Availability
Sold
Size
8 x 5.5 x 3 cm - Sm Cabinet 
Formula
Ca5(PO4)3F (RRUFF)
Locality
Fowey Consols mine, St. Austell dist., Cornwall, England
Tagged
phosphate

A fairly nice example of open-vein type mineralization from this mine, a major copper producer in Cornwall and well known for it Bismuthinite specimens. This specimen in loaded with colorless, thin tabular and hexagonal Fluorapatite crystals to 1mm which are hard to see in the photos but are clearly seen with excellent definition under the scope. The Sphalerite is well crystallized also having a deep red to orange transparency. The old Barstow label mentions the association with "chalybite" a synonym of Siderite. In this case, Barstow, was mistaken, as this is Sphalerite, not chalybite. Also in the matrix is Pyrite. See the old Barstow label, under provenance. Barstow, who passed away in 1982 was one of the more famous mineral dealers from Cornwall, who actually worked at the South Crofty mine. More can be found on Barstow at the Min. Record label archive.

Fluorapatite

Formula
Ca5(PO4)3
Crystal System
Hexagonal 
Crystal Habit
Massive - Granular, Euhedral Crystals 
Cleavage
Indistinct, None, None 
Luster
Vitreous - Resinous 
Color
blue, brown, colorless, violet, green 
Streak
white 
Class
Hexagonal - Dipyramidal 
Fracture
Brittle - Conchoidal 
Hardness

Data courtesy of Webmineral.

Collection
Phillips Collection

Barstow label

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