Moving mountains for you
Switch currency

Current Live Auctions

Current Live Fixed Price Sales

Cerianite-(Ce) & Monazite-(Ce) Psm Bastnäsite-(Ce)

Views:
Watches:
PDM739376

Cerianite-(Ce) & Monazite-(Ce) Psm Bastnäsite-(Ce)

Pseudomorph

Description Tabs

Description
Locality: 
Gakara, Bujumbura Rural Province, Burundi
Class: 
Crystals on Matrix
Size Range: 
Small cabinet (7-10 cm)
Size: 
8.7 × 6 × 5.6 cm
Description

Big block of crystallized bastnäsite-(Ce), with some euhedral crystals, almost completely transformed to monazite-(Ce). Some brown relicts of crystallized bastnäsite-(Ce) are still visible in some central parts of the crystals. Additionally the group is superficially altered to green cerianite, and minor pink-orange rhabdophane-(La).

According to Van Wambeke (1977) at Gakara (Karonge) the bastnäsite and monazite are Ce>La, while Rhabdophane is Ce<La. The sample was collected in 1965 by Professor A. Delvaux (1919-1998). Ex. A. Delvaux collection.

Van Wambeke, L. (1977) The Karonge rare earth deposits, Republic of Burundi: New mineralogical-geochemical data and origin of the mineralization. Mineralium Deposita, 12, 3, 373-380.

Mineral Data
What's on the rock

Cerianite-(Ce)

Formula: 
(Ce4+,Th)O2
Strunz: 
4.DL.05
Hardness: 
0.0
Type Locality: 
Dominion Gulf Company claims, Lackner Township, Sudbury District, Ontario, Canada

Monazite-(Ce)

Formula: 
(Ce,La,Nd,Th)(PO4)
Strunz: 
8.AD.50
Hardness: 
5.0 - 5.5
Type Locality: 
Ilmen Natural Reserve, Ilmen Mts, Chelyabinsk Oblast', Southern Urals, Urals Region, Russia...

Bastnäsite-(Ce)

Formula: 
(Ce,La)(CO3)F
Strunz: 
5.BD.20a
Crystal System: 
Hexagonal
Hardness: 
4.0 - 4.5
Type Locality: 
Bastnäs mines, Riddarhyttan, Skinnskatteberg, Västmanland, Sweden

Seller Information

Payment options: offline, paypal_wpp, paypal_wps