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Chevkinite-(Ce) & Dalyite

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PAV917859

Chevkinite-(Ce) & Dalyite

Classic Locality

Description Tabs

Description
Locality: 
Pumice Quarry, Ribeira Grande, San Miguel Island, Azores
Class: 
Crystal Group/Cluster
Size Range: 
Thumbnail (1-3cm)
Size: 
2.7 × 1.8 × 1.7 cm
Description

Several perfect chevkinite-(Ce) crystals on orange dalyite - typical association in this locality.

 

Collected: 
2015
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...

Dalyite

Formula: 
K2ZrSi6O15
Strunz: 
9.EA.25
Crystal System: 
Triclinic
Hardness: 
7.5
Type Locality: 
Green Mountain, Ascension Island, Saint Helena