A mineral of the feldspar family, triclinic in crystallization, and in composition a silicate of alumina and soda.
An eruptive rock allied to trachyte, consisting essentially of a triclinic feldspar, with pyroxene, hornblende, or hypersthene.
A rock of igneous origin, consisting of augite and triclinic feldspar, with grains of magnetic or titanic iron, and also bottle-green particles of olivine frequently disseminated.
A mineral occurring in triclinic crystals approaching pyroxene in angle, and of a greenish black color.
These show that the mass is made up of a series of crystal twins in parallel position and afford an excellent criterion for determining a triclinic Feldspar.
The variety of Feldspar to which the sunstone most in use at the present time belongs is oligoclase, a soda-lime triclinic Feldspar.
They are fusible with difficulty before the blowpipe, crystallize in the monoclinic ortriclinic system and cleave in two well-marked directions nearly or quite at right angles to each other.
Orthoclase crystallizes in the monoclinic system, and all the other feldspars in the triclinic system.
The orthoclase is sometimes replaced in part bytriclinic species, especially albite and oligoclase.
Any of the triclinicfeldspars may occur in this rock, but oligoclase is most common.
With the exception of albite, which is a comparatively rare species, the triclinic feldspars all contain less silica than orthoclase; i.
They crystallize in the monoclinic and triclinic systems; and all possess easy cleavage in two directions at right angles to each other, or nearly so.
In other words, the distinction of orthoclase from the basic or triclinic feldspars is important and comparatively easy, while the distinction of the different basic feldspars from each other is both unimportant and difficult.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "triclinic" in a variety of sentences. We hope that you will now be able to make sentences using this word.
