522 results found

This film belongs to an amphibolite with epidote. This is a metamorphic rock, whose protolith was characterized by a strong basic character. The mineral in equilibrium with amphibole, epidote, garnet, plagioclase, quartz and chlorite. We observed a preferential orientation of all components of the film, including garnets.

This film corresponds to a slate blue. This type of rock are the result of a process that affected the metamorphic rocks of basic geochemical conditions of high pressure and low temperature. The blue shale consists of glaucophane, garnet, muscovite and quartz. They are also distinguishable actinolite, chlorite, plagioclase and titanite, mineral ...

This film shows a rhyolite. This is an acid volcanic rock as evidenced by the abundance of quartz and alkali feldspar. In this film are observed plagioclase, some zoned, with quartz, feldspar and biotite. The array consists of microcrystals of quartz and glass. Also show apatite crystals included in biotite. The most striking aspect of this film ...

This film shows a gneiss. These rocks are the product of a metamorphic process, which usually affects the type granitic rocks and presents a very similar mineralogy. This gneiss consists of quartz, feldspar, plagioclase, epidote and mica (biotite and muscovite in this case). One of the main features of these rocks is texture-oriented crystals of ...

This film corresponds to a green schist. This is a metamorphic rock whose protolith was characterized by a strong basic character. Presents a balanced association of chlorite, actinolite, quartz, plagioclase, and metallic ores. One of the most important textural features in this film is the great development of the foliation can be distinguished ...

In this film shows a basaltic andesite. This is an intermediate-basic volcanic rock that has phenocrysts of plagioclase, as mineral majority, with a marked porphyritic texture. Also observed clinopyroxene and orthopyroxene, but are not abundant. The matrix of this rock is composed of plagioclase and clinopyroxene microcrystals. This exhibit ...

This thin film shows a syenite with feldespatoides. This is an alkaline plutonic rock composed mainly of alkali feldspar crystals. Feldespatoides can appreciate, such as nepheline and sodalite, and glass hipidiomórficos of egirina and titanite.

In this film shows a diorite. This is an intermediate plutonic rock characterized by the presence of plagioclase, alkali feldspar and quartz. In addition to these components are observed abundant clinopyroxene and orthopyroxene crystals with lamellae exolución in both phases. Also shown are metal ores and secondary biotite quite spread by the ...

This film corresponds to a tremolite marble. This rock is the result of a metamorphic process, involving a carbonate rock. It is composed of calcite and tremolite, the last minority. Triple points are observed and a marked inequigranular texture of calcite crystals. The calcite shows a preferential orientation according to the maximum elongation ...

This sheet shows a gabbro. Basic plutonic rock is composed of a high content of augite Titans, noted for its relief and pink color indicating their wealth in Ti. This is encompassed by plagioclase is the major component of the blade. Olivine is a minority and has a strong secondary alteration. Biotite is also seen with browns and augite associated ...