What did Calcflinta say to its date? You're a rock-solid match.

Calcflinta, or calc-flinta, is a fine grained calc–silicate rock found amongst the metamorphic rocks of the eastern Highlands of Scotland. It is a hornfels developed from calcareous mudstone.^[1] Calcflinta is also found, for example, around the margin of the granites in south west Britain, and on King Island in Tasmania.

References

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↑ Dictionary of Mining, Mineral, and Related Terms, the U.S. Bureau of Mines, 1996 Archived 2011-06-09 at the Wayback Machine

v t e Types of rocks
Igneous rock	Andesite Icelandite Boninite Sanukite Anorthosite Appinite Aplite Basalt Alkali basalt Picrite basalt Basaltic trachyandesite Mugearite Shoshonite Basanite Blairmorite Carbonatite Natrocarbonatite Sovite Charnockite Enderbite Dacite Adakitic dacite Diabase Diorite Napoleonite Foidolite Ijolite Gabbro Troctolite Norite Hornblende gabbro Granite Alkali feldspar granite Monzogranite Leucogranite Granodiorite Granophyre Hornblendite Hyaloclastite Komatiite Lamproite Lamprophyre Monzonite Larvikite Quartz monzonite Monzogabbro Essexite Nepheline syenite Borolanite Nephelinite Obsidian Pegmatite Peridotite Wehrlite Dunite Harzburgite Lherzolite Hornblende peridotite Kimberlite Phonolite Phonotephrite Pumice Pyroxenite Websterite Clinopyroxenite Orthopyroxenite Quartz diorite Quartzolite Rhyodacite Rhyolite Comendite Pantellerite Scoria Reticulite Shonkinite Sideromelane Syenite Tachylite Tephriphonolite Tephrite Tonalite Trondhjemite Trachyandesite Benmoreite Latite Trachybasalt Hawaiite Trachyte Tuff Ignimbrite
Sedimentary rock	Banded iron formation Breccia Chert Flint Coal Lignite Anthracite Conglomerate Diamictite Diatomite Dolomite Evaporite Geyserite Jaspillite Laterite Limestone Calcarenite Chalk Coquina Lumachelle Marl Oolite Travertine Tufa Wackestone Mudstone Argillite Claystone Shale Siltstone Oil shale Phosphorite Sandstone Arkose Greywacke Gritstone Itacolumite Sylvinite Tillite Turbidite Varve
Metamorphic rock	Amphibolite Blueschist Cataclasite Corundite Eclogite Epidosite Gneiss Granulite Greenschist Hornfels Calcflinta Itabirite Jadeitite Lapis lazuli Litchfieldite Marble Migmatite Mylonite Metapelite Phyllite Pseudotachylite Quartzite Schist Serpentinite Skarn Slate Suevite Talc carbonate Soapstone Tectonite Tektite Moldavite Whiteschist
Specific varieties	Ganister Gossan Jasperoid Kenyte Larvikite Litchfieldite Llanite Luxullianite Mangerite Novaculite Pyrolite Rapakivi granite Rhomb porphyry Rodingite Taconite Teschenite Theralite Unakite Variolite Wad
Non-terrestrial rocks (meteorites)	Achondrite Primitive achondrite Asteroidal achondrite Lunar meteorite Martian meteorite Chondrite Carbonaceous chondrite Enstatite chondrite Ordinary chondrite Rumurutiite Iron meteorite Stony-iron meteorite Mesosiderite Pallasite

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References