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Steacyite Narsarsukite Dalyite & Elpidite

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CHA505188

Steacyite Narsarsukite Dalyite & Elpidite

Classic Locality

Description Tabs

Description
Locality: 
Água de Pau Volcano, São Miguel Island, Azores District, Portugal
Class: 
Crystals on Matrix
Size Range: 
Small miniature (3-4.5 cm)
Size: 
4 × 3.5 × 3 cm
Description

Beautiful specimen with a very rich association: there are two large complex crystals of gemmy apple green steacyite, some other tiny crystals of steacyite, one large orange/brown crystal of narsarsukite ( photo 4), one colorless/white crystals of elpidite (photo 5) and many aggrgates of orange/brown crystals of dalyite  

Mineral Data
What's on the rock

Steacyite

Formula: 
(◻,K)(Na,Ca)2(Th,U)[Si8O20]
Strunz: 
9.CH.10
Hardness: 
5.0
Type Locality: 
Poudrette quarry (Demix quarry; Uni-Mix quarry; Desourdy quarry; Carrière Mont Saint-Hilaire), Mont Saint-Hilaire, La Vallée-du-Richelieu RCM, Montérégie, Québec, Canada

Narsarsukite

Formula: 
Na4(Ti,Fe)2[Si8O20](O,OH,F)2
Strunz: 
9.DJ.05
Hardness: 
7.0
Type Locality: 
Narsaarsuk pegmatite (Narssârssuk pegmatite), Narsaarsuk Plateau, Igaliku (Igaliko), Narsaq, Kujalleq, Greenland

Dalyite

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

Elpidite

Formula: 
Na2ZrSi6O15·3H2O
Strunz: 
9.DG.65
Crystal System: 
Orthorhombic
Hardness: 
5.0

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