Sillimanite kyanite schist - Glen Doll
Collection:
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Object

Fact sheet

Sillimanite kyanite schist - Glen Doll

This rock was deposited as a siltstone or banded silt and mudstone in the late Proterozoic period, before being subject to regional metamorphism in the Grampian orogeny. It now forms part of the Dalradian succession in Scotland within the 'sillimanite' Barrovian metamorphic zone (Barrow zones include chlorite-biotite-garnet-staurolite-kyanite-sillimanite). The rock was collected in Glen Doll, Angus, Tayside, Scotland.

In thin section the rock fabric is dominated by muscovite and biotite micas, intergrown with quartz and feldspars. The thin section also contains abundant kyanite, distinguished by its high relief and dominant length parallel cleavage, and sillimanite characterised by slightly lower relief and rarer basal cleavage. In addition, this thin section contains fibrolite, a fine-grained, needle-like form of sillimanite that overgrows other minerals and clearly grew late in the metamorphic sequence. Garnet is abundant in the lower right-hand side of the thin section.

Additional images
  • sillimanite kyanite schist - width 2.7 cm
  • sillimanite kyanite schist - width 13 cm
Map
56.8826, -3.2537
Description:
Glen Doll, Angus, Tayside, Scotland
Precision:
Poor
About this collection

The United Kingdom Virtual Microscope (UKVM) collection consists of igneous, sedimentary and metamorphic rocks from around the UK.

It is intended as a teaching resource, helping to tell the story of the common rock types and how they form, and reflecting the history of the UK at the margins of the continent of Europe. The collection is a series of teaching sets, for example igneous rocks from the North Atlantic Igneous Province and SW England; high-temperature metamorphic rocks from Scotland and low-temperature metamorphic rocks from Wales; and sedimentary rocks, including English limestones and sandstones.

Sample details

Type
metamorphic
Category
schist
Rock-forming mineral
sillimanite
kyanite
garnet
mica
biotite
muscovite
feldspar
quartz
Category guide  
Category Guide
Title
Refers to any word or phrase that appears in the individual rock names. Names are generally descriptive; they allow users to search for broad terms like ‘granite’ as well as more specific names such as ‘breccia’. However, the adjacent descriptions of the specimens captures a wider range of general words and phrases and is a more powerful search tool.
Description
Refers to any word or phrase that appears anywhere in the descriptions of the specimens
Accessory minerals
Minerals that occur in very low abundance in a rock. They are usually not visible with the naked eye and contribute perhapssver, they often dominate the rare elements such as platinum group metals.
Rock-forming minerals
Minerals that make up the bulk of all rock samples and are also the ones used in rock classi?cation.
Timescale
Selecting one or more period, for example 'Jurassic'.
Theme
A term used to group together related samples that are not already gathered into a single Collection. For instance, there is a ‘SW England granites’ theme that includes such rock types as granite, hydrothermal breccia, skarn and vein samples.
Category
A general term used to label a rock sample. It is a useful way of grouping similar samples throughout a collection. Category names are often, but not exclusively, common rock names (e.g. granite, basalt, dolerite, gabbro, greisen, skarn, gneiss, amphibolite, limestone, sandstone).
Owner
The owner of the sample that appears in the collection. For example, NASA owns all the samples that appear in the Moon Rocks collection
We would like to thank the following for the use of this sample: