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Opal-AN On Feldspar

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HAN889080

Opal-AN On Feldspar

Fluorescent

Description Tabs

Description
Locality: 
Erongo Mountains, Karibib, Erongo Region, Namibia
Class: 
Crystals on Matrix
Size Range: 
Cabinet (10-18 cm)
Size: 
15 × 15 × 10 cm
Weight: 
1 877.00gr
Description

A very large Feldspar crystal specimen partially coated with fluorescent Opal-AN ( Hyalite ) as a last generation growth on the Feldspar.

Very attractive green fluorescence in UV SW, Feldspar fluoresces a dark red in UV SW.

Most Common Fluorescent Activator: (UO2)2+ (Uranyl ion) as impurities

A colourless variety of Opal. Hyalite is opal-AN, an amorphous silica-glass containing about 3-8% water.

Hyalite is quite often present as a coating almost invisible to the naked eye on quartz, feldspar, topaz, black tourmaline, aquamarine etc. falsely suggesting that these minerals fluoresce.

 

Mineral Data
What's on the rock

Opal-AN

Variety Of: 

Opal

Formula: 
SiO2·nH2O
Strunz: 
4.DA.10
Hardness: 
5.5 - 6.5
Formula: 
SiO2·nH2O
Hardness: 
5.5 - 6.5
Streak: 
white

Feldspar

Group Parent: 
Feldspar Group

Seller Information

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After a sale we expect to receive the payment with Pay Pal within 48 hours. You can return the goods within 14 days of receiving them by registered priority mail with tracking number. Buyer pays the costs of the return shipping