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Blairmorite

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Rare porphyritic volcanic rock

Blairmorite
Composition
Extrusive igneous rock
A specimen of blairmorite from theCrowsnest Formation. The amber mineral isanalcime, the pale mineral issanidine and the small black minerals aremelanite garnet.
Primary	Analcime,sanidine,pyroxene
Secondary	Titanite,melanite,nepheline

Blairmorite is a very rare^[1]porphyritic volcanic rock named after the community ofBlairmore in southwesternAlberta, Canada.^[2]^[3] It is characterized by dominantanalcime phenocrysts in amatrix of analcime,sanidine andalkalic pyroxene with accessorytitanite,melanite andnepheline. It is aleucocratic variety ofanalcimite (afoidite).^[4] Blairmorite has also been described as an analcime-rich variety ofphonolite.^[5]^[6]

Thisextrusive igneous rock is known from only twogeological formations worldwide. The foremost blairmorite occurrence is theCrowsnest Formation in the Canadian province of Alberta where it is associated withagglomerates andtuffs fromexplosive eruptions. The other locality is theLupata Gorge inMozambique.^[2]

References

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^MacKenzie, W.S., Donaldson, C.H. and Guilford, C. (1982).Atlas of igneous rocks and their textures. Harlow: Longman. p. 121.ISBN 0-582-30082-7.{{cite book}}: CS1 maint: multiple names: authors list (link)
^^a ^bPearce, T.H. (1993)."Analcime phenocrysts in igneous rocks: Primary or secondary? – Discussion"(PDF).American Mineralogist.78:225–229.
^Johannsen, A. 1933. A descriptive petrography of the igneous rocks, Appendix III, p. 244. Univ. of Chicago Press.
^Le Maitre, R.W. (editor) (2002).Igneous Rocks — A Classification and Glossary of Terms (2nd ed.). Cambridge: Cambridge University Press. pp. 55, 64.ISBN 0-521-66215-X.{{cite book}}:|author= has generic name (help)
^Peterson, T.D.; Currie, K.L. (1993).Analcite-bearing igneous rocks from the Crowsnest Formation, southwestern Alberta (Current Research report 93-B1)(PDF). Geological Survey of Canada. pp. 51–56.
^Deer, W.A.; Howie, R.A.; Zussman, J. (2013).An Introduction to the Rock-Forming Minerals (3rd ed.). London: Mineralogical Society.ISBN 9780903056274.

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Volcanic rocks	Agglomerate Andesite Basalt Basaltic andesite Benmoreite Blairmorite Cinder Dacite Felsite Ignimbrite Komatiite Lapilli Latite Leucitite Nephelinite Obsidian Phonolite Phonotephrite Pumice Rhyodacite Rhyolite Tephra Tephriphonolite Trachyandesite Trachybasalt Trachyte Tuff Pyroclastic fall Pyroclastic flow
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v t e Types of rocks
Igneous rock	Adakite Alkali feldspar granite Andesite Anorthosite Aplite Basalt Alkali basalt Picrite basalt Basaltic trachyandesite Mugearite Shoshonite Basanite Blairmorite Boninite Carbonatite Charnockite Enderbite Dacite Diabase Diorite Napoleonite Dunite Essexite Foidolite Gabbro Granite Granodiorite Granophyre Harzburgite Hornblendite Hyaloclastite Icelandite Ignimbrite Ijolite Kimberlite Komatiite Lamproite Lamprophyre Latite Lherzolite Monzogranite Monzonite Nepheline syenite Nephelinite Norite Obsidian Pegmatite Peridotite Phonolite Phonotephrite Porphyry Pumice Pyroxenite Quartz diorite Quartz monzonite Quartzolite Rhyodacite Rhyolite Comendite Pantellerite Scoria Shonkinite Sovite Syenite Tachylyte Tephriphonolite Tephrite Tonalite Trachyandesite Benmoreite Trachybasalt Hawaiite Trachyte Troctolite Trondhjemite Tuff Websterite Wehrlite
Sedimentary rock	Argillite Arkose Banded iron formation Breccia Calcarenite Chalk Chert Claystone Coal Conglomerate Coquina Diamictite Diatomite Dolomite Evaporite Flint Geyserite Greywacke Gritstone Itacolumite Jaspillite Laterite Lignite Limestone Lumachelle Marl Mudstone Oil shale Oolite Phosphorite Sandstone Shale Siltstone Sylvinite Tillite Travertine Tufa Turbidite Varve Wackestone
Metamorphic rock	Anthracite Amphibolite Blueschist Cataclasite Eclogite Gneiss Granulite Greenschist Hornfels Calcflinta Itabirite Litchfieldite Marble Migmatite Mylonite Metapelite Metapsammite Phyllite Pseudotachylite Quartzite Schist Serpentinite Skarn Slate Suevite Talc carbonate Soapstone Tectonite Whiteschist
Specific varieties	Adamellite Appinite Aphanite Borolanite Blue Granite Epidosite Felsite Flint Ganister Gossan Hyaloclastite Ijolite Jadeitite Jasperoid Kenyte Lapis lazuli Larvikite Litchfieldite Llanite Luxullianite Mangerite Novaculite Pietersite Pyrolite Rapakivi granite Rhomb porphyry Rodingite Shonkinite Taconite Tachylite Teschenite Theralite Unakite Variolite Wad

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