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Monteregianite & Arfvedsonite & Ancylite-(Ce)

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CFL802808

Monteregianite & Arfvedsonite & Ancylite-(Ce)

Type Locality

Description Tabs

Description
Locality: 
Poudrette Quarry, Mont Saint-Hilaire, Québec, Canada
Class: 
Crystal Group/Cluster
Size Range: 
Small miniature (3-4.5 cm)
Size: 
3 × 2.5 × 2 cm
Description

Uncommon gorgeous type locality specimen of monteregianite-(Y) crystals associated with arfvedsonite, calcite, epididymite, ancylite-(Ce) and white needles of an unidentified species.  This specimen is very rich in epididymite, ancylite-(Ce) and white needles of an unidentified species.  The Poudrette Quarry is the only locality where monteregianite-(Y) is found.  Collected by Gilles Haineault in 1993.

Mineral Data
What's on the rock

Monteregianite

Synonym Of: 

Monteregianite-(Y)

Formula: 
(Na,K)6(Y,Ca)2Si16O38·10H2O
Strunz: 
9.EB.15
Hardness: 
3.5

Arfvedsonite

Formula: 
[Na][Na2][Fe2+4Fe3+]Si8O22(OH)2
Strunz: 
9.DE.25
Hardness: 
5.0 - 6.0
Type Locality: 
Kangerluarsuk Fjord (Kangerdluarssuq Fjord), Ilímaussaq complex, Narsaq, Kujalleq, Greenland

Ancylite-(Ce)

Formula: 
SrCe(CO3)2(OH)·H2O
Strunz: 
5.DC.05
Crystal System: 
Orthorhombic
Hardness: 
4.0 - 4.5
Streak: 
White
Type Locality: 
Narsaarsuk pegmatite (Narssârssuk pegmatite), Narsaarsuk Plateau, Igaliku (Igaliko), Narsaq, Kujalleq, Greenland

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