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Hornblende

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MCH198424

Hornblende

ex Dr. Harry von Eckermann collection

Description Tabs

Description
Locality: 
Kragerø, Vestfold og Telemark, Norway
Size Range: 
Small cabinet (7-10 cm)
Size: 
8.4 × 6.8 × 5.8 cm
Description

Hornblende from Kragerø is sporadically offered on the market, mostly of average quality. This specimen, however, hosts a number of excellent, lustrous, black, partly nicely double terminated crystals with „asbestos“ on the terminations. The specimen was erroneously labeled as augite by Eckermann.

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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