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Quartz-eclogite

A rock subtype
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Qaurtz-eclogite is an eclogite that contains quartz as a notable, though not dominant, mineral component. There are no strict upper or lower limits on the amount of quartz required to classify a rock as quartz-eclogite. Instead, the term is used to highlight specific petrological or geological features that distinguish these rocks from other types of eclogite.

Quartz-eclogites form from relative silica-rich basic protoliths, including basalts (Miller et al., 2005) and gabbros (Okay et al., 1985). Quartz eclogites may also form from mixtures of basic and more silica-rich sediments as reported by Miyamoto et al.(2007).

At Ultra-High Pressure (UHP) conditions quartz are transformed into its high pressure polymorph coesite.


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Unique IdentifiersHide

Mindat ID:
489584
Long-form identifier:
mindat:1:1:489584:4

Classification of Quartz-eclogiteHide

Mineralogy of Quartz-eclogiteHide

Essential minerals - these are minerals that are required within the classification of this rock:
Garnet GroupX3Z2(SiO4)3
Pyroxene > Clinopyroxene > Omphacite(NaaCabFe2+cMgd)(AleFe3+fFe2+gMgh)Si2O6
Silica > QuartzSiO2
Non-essential minerals - these minerals are common, sometimes major components, but are not always present:
AmphiboleA petrological term for Amphibole Supergroup.
KyaniteAl2(SiO4)O
PhengiteKAl1.5(Mg,Fe)0.5(Al0.5Si3.5O10)(OH)2
Pyroxene > OrthopyroxeneA petrological term for Orthopyroxene Subgroup.
RutileTiO2
Zoisite(CaCa)(AlAlAl)O[Si2O7][SiO4](OH)

Internet Links for Quartz-eclogiteHide

References for Quartz-eclogiteHide

Localities for Quartz-eclogiteHide

Showing 1 localities.

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.
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Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for references and further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (e.g. from pseudomorphs).

All localities listed without proper references should be considered as questionable.
Austria
 
  • Styria
    • Deutschlandsberg District
      • Wies
        • Wernersdorf
Miller et al. (2005)
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