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Gneiss

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About GneissHide

A medium- to high-grade metamorphic rock that commonly has a banded structure and is generally medium- to coarse-grained with poorly developed schistosity.
A foliated rock formed by regional metamorphism, in which bands or lenticles of granular minerals alternate with bands or lenticles in which minerals having flaky or elongate prismatic habits predominate. Generally, less than 50% of the minerals show preferred parallel orientation. Although a gneiss is commonly feldspar- and quartz-rich, the mineral composition is not an essential factor in its definition. Varieties are distinguished by texture (e.g., augen gneiss), characteristic minerals (e.g., hornblende gneiss), or general composition and/or origins (e.g., granite gneiss, orthogneiss, paragneiss).


Classification of GneissHide

Sub-divisions of GneissHide

Mineralogy of GneissHide

Non-essential minerals - these minerals are common, sometimes major components, but are not always present:
AmphiboleAX2Z5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
FeldsparA petrological term for Feldspar Group.
MicaA petrological term for Mica Group.
Silica > QuartzSiO2

Pronounciation of GneissHide

Pronounciation:
PlayRecorded byCountry
Jolyon & Katya RalphUnited Kingdom

Age distributionHide

Recorded ages:
Neochaotian to Devonian : ~4600 Ma to 358.9 ± 0.4 Ma - based on 9 recorded ages.

Internet Links for GneissHide

mindat.org URL:
https://www.mindat.org/min-48629.html
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Localities for GneissHide

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListShow

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