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Ferro-hornblende

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PDM611122

Ferro-hornblende

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Description
Locality: 
Izaña Mountain, Santa Cruz de Tenerife, Canary Islands, Spain
Class: 
Single Crystal
Size Range: 
Thumbnail (1-3cm)
Size: 
1.7 × 0.9 × 0.7 cm
Description

Black doubly-ended crystal of ferro-hornblende with good lustre and with two different terminations. The specimen was collected in 2010 at 2300m high with a special authorization at the Izaña Mountain, a restricted area because it is the location where the Astrophysical Institute of Canarias has some telescopes.

Mineral Data
What's on the rock

Ferro-hornblende

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

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