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Fergusonite

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Watches:
LGM818955

Fergusonite

Ex Dr. Krantz, Bonn, Germany
With Antique Label

Description Tabs

Description
Locality: 
Sri Lanka
Class: 
Massive/Crystalline
Size Range: 
Thumbnail (1-3cm)
Size: 
1.4 × 2 × 1.1 cm
Weight: 
11.50gr
Description

A rounded fergusonite pebble with a brown crust of decomposition products, likely from a placer deposit.

Comes with nice old Dr. F. Krantz pen and ink label dated around or before 1902. Background: In June 1901, due to passing of some resolutions in the context of a reform of german orthography, the spelling of german "Contor" (branch office) was altered to "Kontor".
Unfortunately I was not able to identify a location named 'Kinagahadanga' or 'Kinayahadanya', 'Ceylon' is the old name for modern Sri Lanka.

Slightly radioactive due to content of U, Th and/or rare earth elements (appr. 5.0 micro Sv/h within spitting distance).

Mineral Data
What's on the rock

Fergusonite

Synonym Of: 

Fergusonite-(Ce)

Formula: 
(Ce,La,Nd)NbO4
Strunz: 
7.GA.05
Hardness: 
5.5 - 6.5

Fergusonite-(Y)

Formula: 
YNbO4
Strunz: 
7.GA.05
Hardness: 
5.5 - 6.5

Seller Information

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