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Steacyite Fluornatropyrochlore Eudialyte & Zircon

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SER1111394

Steacyite Fluornatropyrochlore Eudialyte & Zircon

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Description
Locality: 
Água de Pau Volcano, São Miguel Island, Azores District, Portugal
Class: 
Crystal Group/Cluster
Size Range: 
Small cabinet (7-10 cm)
Size: 
8 × 4.5 × 3.5 cm
Description

a large specimen featuring several vugs ; one vug hosts a good group of divergent, light green steacyite crystals and some dark green aegirine; other vugs are filled with yellow eudialyte, orange fluornatropyrochlore, zircons and aegirine ; a very rich specimen indeed

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

Fluornatropyrochlore

Formula: 
(Na,REE,Ca)2Nb2(O,OH)6F
Hardness: 
0.0
Type Locality: 
Maoniuping Mine, Mianning Co., Liangshan Autonomous Prefecture, Sichuan Province, China

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

Zircon

Formula: 
ZrSiO4
Strunz: 
9.AD.30
Crystal System: 
Tetragonal
Hardness: 
7.5
Streak: 
White

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Start 22 Apr 18:00
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