How is Troctolite made


Author: Torsten Purle ( | Last update: April 15, 2021

Troctolite - properties, formation and use

English: troctolite | French: troctolite

The name troctolite comes from the Greek and is associated with Trout stone translated - based on the appearance of the rock, which is reminiscent of the patchy drawings of trout.

Properties of toctolite

definition: Troctolite is an igneous rock of intrusive origin and basic classification.

Troctolite is dark in color, mostly greyish with speckled or dotted inclusions of minerals, mainly olivine, reminiscent of the pattern of trout.

In addition to plagioclases, especially bytownite and labradorite, orthoclases and olivines are among the main components of troctolites.

Pyroxene, hornblende, magnetite and biotite, and in the case of alteration of the olivine-containing constituents, serpentine minerals, are also involved in the mineral composition of troctolite.
Basically, the proportion of light-colored mixtures predominates that of the mafic minerals.

The structure of the deep rock shows a directionless arrangement of the aggregate parts, the grain size of which is medium-grain with xeno- to idiomorphic crystal form.

Formation and distribution of troctolite

As a member of the gabbro family, troctolite arises under the earth's surface and emerges from the slow solidification of appropriately composed magmas.

Accompanying rocks of the plutonite are, for example, norite and anorthosite.

Notable troctolite deposits can be found in Scotland, among others; Cornwall / England; Harz / Germany; Bushveld Complex / South Africa; Zimbabwe; Labrador / Canada; Montana / USA and in western Australia. Troctolite deposits were also found on the moon.

Importance and use of troctolite

Troctolites are used, among other things, as road surface or to design facades in the interior and are processed as worktops.

See also:
⇒ Weathering of rocks
⇒ The formation of igneous rocks
⇒ Characteristics of rocks: main and secondary parts

⇒ Pellant, C. (1994): Stones and Minerals. Ravensburger nature guide. Ravensburger Buchverlag Otto Maier GmbH
⇒ Maresch, W., Medenbach, O .; Trochim, H.-D. (1987): The colored natural guide rocks. Mosaik Verlag GmbH Munich
⇒ Murawski, H. (1992): Geological Dictionary. Ferdinand Enke Verlag Stuttgart
⇒ Okrusch, M. and S. Matthes (2009): Mineralogy: An introduction to special mineralogy, petrology and deposit science. Springer Verlag Berlin Heidelberg