Hornblendite is a plutonic rock consisting mainly of the amphibole hornblende. Hornblende-rich ultramafic rocks are rare and when hornblende is the dominant mineral phase they are classified as hornblendites with qualifiers such as garnet hornblendite identifying a second abundant contained mineral.
Metamorphic rocks composed dominantly of amphiboles are referred to as amphibolites.
References
- Blatt, Harvey and Robert J. Tracy (1996) Petrology, Freeman, p. 72, ISBN 0-7167-2438-3
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