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.
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.
Unique Identifiers
Mindat ID:
55143
Long-form identifier:
mindat:1:1:55143:0
GUID
(UUID V4):
(UUID V4):
6a864da3-a9d6-4d02-a918-f2a74f827f2b
Classification of Skomerite
Mineralogy of Skomerite
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 | Commonly used as a synonym for a member of the Fayalite-Forsterite Series, but more generally and properly ... |
| Pyroxene > Clinopyroxene > Augite | (CaxMgyFez)(Mgy1Fez1)Si2O6 |
References for Skomerite
Reference List:
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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.
Thomas, H. H. 1911. The Skomer Volcanic Series (Pembrokeshire). Q. II geol. Soc. Lond., 67, 175-214.
Internet Links for Skomerite
mindat.org URL:
https://www.mindat.org/min-55143.html
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Localities for Skomerite
symbol to view information about a locality.
The Locality List
- 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).
All localities listed without proper references should be considered as questionable.
UK | |
| Thomas, H. H. (1911). The Skomer Volcanic Series (Pembrokeshire). Quarterly Journal of the Geological Society, 67(1-4), 175-214. doi.org/10.1144/GSL.JGS.1911.067.01-04.07 Thorpe, R. S., Leat, P. T., Bevins, R. E., & Hughes, D. J. (1989). Late-orogenic alkaline/subalkaline Silurian volcanism of the Skomer Volcanic Group in the Caledonides of south Wales. Journal of the Geological Society, 146(1), 125-132. doi.org/10.1144/gsjgs.146.1.0125 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. doi.org/10.1016/S0016-7878(69)80031-3 |
