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Syenitic :: Syenite (n.) A granular, crystalline, ingeous rock composed of orthoclase and hornblende, the latter often replaced or accompanied by pyroxene or mica. Syenite sometimes contains nephelite (elaeolite) or leucite, and is then called nephelite (elaeolite) syenite or leucite syenite..

Foliation :: Foliation (n.) The property, possessed by some crystalline rocks, of dividing into plates or slabs, which is due to the cleavage structure of one of the constituents, as mica or hornblende. It may sometimes include slaty structure or cleavage, though the latter is usually independent of any mineral constituent, and transverse to the bedding, it having been produced by pressure..

Andesite :: Andesite (n.) An eruptive rock allied to trachyte, consisting essentially of a triclinic feldspar, with pyroxene, hornblende, or hypersthene..

Syenite :: Syenite (n.) Orig., a rock composed of quartz, hornblende, and feldspar, anciently quarried at Syene, in Upper Egypt, and now called granite..

Crocidolite :: Crocidolite (n.) A mineral occuring in silky fibers of a lavender blue color. It is related to hornblende and is essentially a silicate of iron and soda; -- called also blue asbestus. A silicified form, in which the fibers penetrating quartz are changed to oxide of iron, is the yellow brown tiger-eye of the jewelers..

Aphanite :: Aphanite (n.) A very compact, dark-colored /ock, consisting of hornblende, or pyroxene, and feldspar, but neither of them in perceptible grains..

Amphibole :: Amphibole (n.) A common mineral embracing many varieties varying in color and in composition. It occurs in monoclinic crystals; also massive, generally with fibrous or columnar structure. The color varies from white to gray, green, brown, and black. It is a silicate of magnesium and calcium, with usually aluminium and iron. Some common varieties are tremolite, actinolite, asbestus, edenite, hornblende (the last name being also used as a general term for the whole species). Amphibole is a constit

Byssolite :: Byssolite (n.) An olive-green fibrous variety of hornblende.

Tremolite :: Tremolite (n.) A white variety of amphibole, or hornblende, occurring in long, bladelike crystals, and coarsely fibrous masses..

Diorite :: Diorite (n.) An igneous, crystalline in structure, consisting essentially of a triclinic feldspar and hornblende. It includes part of what was called greenstone..

Pargasite :: Pargasite (n.) A dark green aluminous variety of amphibole, or hornblende..

Subhumerate :: Subhornblendic (a.) Containing hornblende in a scattered state; of or relating to rocks containing disseminated hornblende.

Hornblende :: Hornblende (n.) The common black, or dark green or brown, variety of amphibole. (See Amphibole.) It belongs to the aluminous division of the species, and is also characterized by its containing considerable iron. Also used as a general term to include the whole species..

Hornblendic :: Hornblendic (a.) Composed largely of hornblende; resembling or relating to hornblende.

Picrite :: Picrite (n.) A dark green igneous rock, consisting largely of chrysolite, with hornblende, augite, biotite, etc..

Anthophyllite :: Anthophyllite (n.) A mineral of the hornblende group, of a yellowish gray or clove brown color..

Gneiss :: Gneiss (n.) A crystalline rock, consisting, like granite, of quartz, feldspar, and mica, but having these materials, especially the mica, arranged in planes, so that it breaks rather easily into coarse slabs or flags. Hornblende sometimes takes the place of the mica, and it is then called hornblendic / syenitic gneiss. Similar varieties of related rocks are also called gneiss..

Capel :: Capel (n.) A composite stone (quartz, schorl, and hornblende) in the walls of tin and copper lodes..

Eclogite :: Eclogite (n.) A rock consisting of granular red garnet, light green smaragdite, and common hornblende; -- so called in reference to its beauty..

Trachyte :: Trachyte (n.) An igneous rock, usually light gray in color and breaking with a rough surface. It consists chiefly of orthoclase feldspar with sometimes hornblende and mica..

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