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Allanite-(La) & Marialite

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MEX566995

Allanite-(La) & Marialite

Rare Mineral

Description Tabs

Description
Locality: 
Nueva Vizcaya Mine, Burguillos del Cerro, Extremadura, Spain
Class: 
Crystals on Matrix
Size Range: 
Thumbnail (1-3cm)
Size: 
2.8 × 1.7 × 1.5 cm
Weight: 
5.00gr
Description

Dark black single crystal of allanite-lanthanum on rich actinolite matrix. The white crystals are marialite. Additional are here light green epidote and yellow to brown titanite. The material is analysed.

Mineral Data
What's on the rock

Allanite-(La)

Formula: 
{CaLa}{Al2Fe2+}(Si2O7)(SiO4)O(OH)
Strunz: 
9.BG.05b
Crystal System: 
Monoclinic
Hardness: 
6.0
Streak: 
Brown
Type Locality: 
Buca della Vena Mine, Ponte Stazzemese, Stazzema, Apuan Alps, Lucca Province, Tuscany, Italy

Marialite

Formula: 
Na4Al3Si9O24Cl
Strunz: 
9.FB.15
Hardness: 
5.5 - 6.0
Streak: 
White
Type Locality: 
Pianura, Phlegrean Fields, Naples Province, Phlegrean Volcanic complex, Campania, Italy