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Magnesio-hornblende Calcite Magnetite Fluorapatite & Albite

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PAV924894

Magnesio-hornblende Calcite Magnetite Fluorapatite & Albite

Classic Locality

Description Tabs

Description
Locality: 
Montijos Quarry, Monte Redondo, Leiria, Leiria District, Portugal
Class: 
Crystal Group/Cluster
Size Range: 
Small miniature (3-4.5 cm)
Size: 
4.2 × 1.8 × 1.8 cm
Description

A true classic of the Portuguese mineralogy!

Several deep green magnesio-hornblende crystals with small calcite on them. Some magnetite, fluorapatite and albite crystals are also present.

Collected: 
2005
Boxed with Label
Mineral Data
What's on the rock

Magnesio-hornblende

Formula: 
☐{Ca2}{Mg4Al}(AlSi7O22)(OH)2
Strunz: 
9.DE.10
Crystal System: 
Monoclinic
Hardness: 
5.0 - 6.0

Calcite

Polymorph of: 
Formula: 
CaCO3
Strunz: 
5.AB.05
Crystal System: 
Trigonal
Hardness: 
3.0
Streak: 
White

Magnetite

Formula: 
Fe2+Fe3+2O4
Strunz: 
4.BB.05
Crystal System: 
Isometric
Hardness: 
5.5 - 6.5
Streak: 
Black

Fluorapatite

Formula: 
Ca2Ca3(PO4)3F
Strunz: 
8.BN.05
Crystal System: 
Hexagonal
Hardness: 
5.0
Streak: 
White
Type Locality: 
Sauberg Mine, Ehrenfriedersdorf, Erzgebirge, Saxony, Germany

Albite

Formula: 
NaAlSi3O8
Strunz: 
9.FA.35
Crystal System: 
Triclinic
Hardness: 
6.0 - 6.5
Streak: 
White
Type Locality: 
Finnbo (Finbo), Falun, Dalarna, Sweden