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Chevkinite-(Ce) Britholite-(Ce) & Eudialyte

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PAV914193

Chevkinite-(Ce) Britholite-(Ce) & Eudialyte

Classic Locality

Description Tabs

Description
Locality: 
Lombadas, Ribeira Grande, São Miguel Island, Azores District, Portugal
Class: 
Crystal Group/Cluster
Size Range: 
Thumbnail (1-3cm)
Size: 
2.4 × 1.9 × 1.7 cm
Description

Just a fantastic combo!

Gemmy brown chevkinite-(Ce) crystals on pale pink britholite-(Ce) prismatic crystal.
Also on the britholite, we can see two creamy eudialyte crystals. Aegirine is present as green elongated crystals.
 

Collected: 
Boxed with Label
Mineral Data
What's on the rock

Chevkinite-(Ce)

Formula: 
(Ce,La,Ca,Th)4(Fe2+,Mg)(Fe2+,Ti,Fe3+)2(Ti,Fe3+)2(Si2O7)2O8
Strunz: 
9.BE.70
Crystal System: 
Monoclinic
Hardness: 
5.0 - 5.5
Colour: 
black
Type Locality: 
Pit No. 17, Ilmen Natural Reserve, Ilmen Mts, Chelyabinsk Oblast', Southern Urals, Urals Region, Russia...

Britholite-(Ce)

Formula: 
Ca2(Ce,Ca)3(SiO4,PO4)3(OH,F)
Strunz: 
9.AH.25
Crystal System: 
Hexagonal
Hardness: 
5.5
Type Locality: 
Naujakasik (Naajakasik), Tunulliarfik Fjord (Tunugdliarfik), Ilímaussaq complex, Narsaq, Kujalleq, Greenland

Eudialyte

Formula: 
Na15Ca6(Fe2+,Mn2+)3Zr3[Si25O73](O,OH,H2O)3(OH,Cl)2
Strunz: 
9.CO.10
Hardness: 
5.0 - 6.0
Type Locality: 
Kangerluarsuk Fjord (Kangerdluarssuq Fjord), Ilímaussaq complex, Narsaq, Kujalleq, Greenland