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0 item @ $0.00  

Fluorite

#PD31740

Fluorite

#PD31740
Availability
Sold
Size
8 x 5 x 4 cm - Sm Cabinet 
Formula
CaF2 (RRUFF)
Locality
St. Agnes, Cornwall, England
Tagged
antique , halide

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.

Antique Specimen

Fluorite

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

Data courtesy of Webmineral.

Collection
Phillips Collection
Special Info
Antique Specimen

Ex. Fredrick Canfield & US National Museum specimen

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