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Hornblende

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QRI897235

Hornblende

Ex coll. Contarini (I)

Description Tabs

Description
Locality: 
Mount Forno, Muretto Valley, Sondrio Province, Lombardy, Italy
Class: 
Crystals on Matrix
Size Range: 
Miniature (4.5-7 cm)
Size: 
5.6 × 5.4 × 3.9 cm
Largest Crystal: 
0.40cm
Weight: 
122.00gr
Description

Rich miniature comprising several terminated hornblende crystals in the metamorphic matrix from this Italian Alpine locale.
The specimen comes with a handwritten label from the former Contarini collection (1891-1973), a renowned late Italian naturalist.

Mineral Data
What's on the rock

Hornblende

Synonym Of: 

Ferro-hornblende

Formula: 
☐{Ca2}{Fe2+4Al}(AlSi7O22)(OH)2
Strunz: 
9.DE.10
Hardness: 
5.0 - 6.0

Magnesio-hornblende

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

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