Skomerite

A rock subtype

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A local term for a volcanic rock composed of phenocrysts of albite-oligoclase, augite and minor olivine in a groundmass of albite, chlorite and opaques.

The term skomerite was applied by Thomas to a prevalent fine-grained rock-type composed of augite, olivine, albite-oligoclase, iron ore and chlorite. He regarded the skomerites as intermediate in composition between marloesite and mugearite. In their mineralogy skomerites seem to resemble spilites, but in the absence of a chemical analysis their true status remains unresolved.

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Unique IdentifiersHide

Mindat ID:

55143

Long-form identifier:

mindat:1:1:55143:0

Classification of SkomeriteHide

Rock
- Igneous rock
  - Normal crystalline igneous rock
    - Fine-grained ("volcanic") normal crystalline igneous rock
      - Skomerite

Mineralogy of SkomeriteHide

Essential minerals - these are minerals that are required within the classification of this rock:

Chlorite	A name commonly used for undifferentiated members of the chlorite group.
Feldspar > Plagioclase	(Na,Ca)[(Si,Al)AlSi₂]O₈
Olivine	M₂SiO₄
Pyroxene > Clinopyroxene > Augite	(Ca_xMg_yFe_z)(Mg_y1Fe_z1)Si₂O₆

Internet Links for SkomeriteHide

mindat.org URL:

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References for SkomeriteHide

Reference List:

[1] Thomas, H. H. 1911. The Skomer Volcanic Series (Pembrokeshire). Q. II geol. Soc. Lond., 67, 175-214.

[2] Ziegler, A. M., McKerrow, W. S., Burne, R. V., & Baker, P. E. (1969). Correlation and environmental setting of the Skomer Volcanic Group, Pembrokeshire. Proceedings of the Geologists' Association, 80(4), 409-439.

Localities for SkomeriteHide

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

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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.

Wales

Pembrokeshire

Marloes and St Brides

ⓘ Skomer Volcanic Group

Thomas (1911) +2 other references