In other instances the hornblende predominates to such a degree, that a large or small-grained diorite, or greenstone, results.
The minerals at contact are quartz, biotite, magnetite and hornblende.
The disturbance is easily accounted for by the hornblende in the granite, or by other iron-bearing rocks.
The magnetic iron ore is associated with hornblende and quartzite.
The essential minerals, hornblende and felspar, rarely show crystalline outlines, and this is generally true also of the others.
Brown hornblende, like that of the camptonites, occurs in many of them.
If hornblende is the most abundant mineral, the same scaly structure shows in a dark rock called hornblende schist, rich in iron.
hornblende, like augite, also includes a great many minerals.
This latter embraces boulders of quartz and hornblende rock, along with limestones and sandstones.
Diorite is a crystalline aggregate of a soda-felspar and hornblende.
The term "Hornblende" is an old German name for any dark, prismatic crystal found with metallic ores but containing no valuable metal (the word "Blende" indicates "a deceiver") [Herbert Bucksch, "Dictionary Geotechnical Engineering," 1995]
A common, green to black mineral of the amphibole group. It has a variable composition and occurs in monoclinic crystals with a hexagonal cross-section, in fibrous forms, or in granular forms. Hornblende is found in many metamorphic and igneous rocks. Chemical formula: (Ca,Na)2-3(Mg,Fe,Al)5(Al,Si)8O22(OH)22.