Rocks

List of rock samples described in separate posts. Systematic overview of rock types with links to posts is in another list — Rock types.

	Nepheline pegmatite	A pegmatitic foidolite (nephelinolite) with large nepheline phenocrysts.
	Spessartine pegmatite from Norway	A pegmatite with large spessartine, muscovite, and plagioclase crystals.
	Zircon pegmatite	A pegmatite containing only large zircon crystals and biotite.
	Retrograde eclogite	It surely was eclogite but what is it now?
	Charoite skarn	A very rare type of skarn with chain silicates charoite and canasite.
	Skarn from New York State	A skarn with wollastonite, diopside, and andradite.
	Granitic pegmatite	Sometimes pegmatite is just a coarse-grained granite.
	Graphite schist with pyrite	Why are graphite and pyrite together in this rock?
	What happens when magma attacks carbonates	Skarn from The Dolomites.
	Agate breccia	Brecciated agate from the Black Forest, Germany.
	Dunite xenolith	Dunite xenolith in a basaltic lava.
	Impact breccia from the Ries crater	Silicified limestone brecciated by the impact event that created the Nördlinger-Ries meteorite crater.
	Migmatized gneiss from Norway	Highly folded migmatized gneiss from Norway.
	Hydrothermally altered granite	Green epidote vein in granite.
	Mylonite from Estonia	Metamorphic rock with ‘eyes’ or augens.
	Most famous gneiss in the Internet	The story of a gneiss hand sample.
	Olivine basalt	There are really lots of olivine grains in this basalt from Oahu, Hawaii.
	Scoria from Etna	Scoria is highly vesicular glassy volcanic rock. But what is the difference between scoria and pumice?
	Sea glass	Some sand grains are made of artificial material. One of the best examples is glass which turns into rounded and beautiful glass pellets sometimes found in beach sand.
	Ruskeala marble	Marble from Ruskeala quarry in Karelia.
	Lunar anorthosite	Anorthosite on the Moon is many ways different from its terrestrial cousin.
	Jotnian sandstone	This feldspar-rich rock is usually named either Jotnian sandstone, quartzite, or arkose.
	Columnar basalt	Basalt columns and lava rosette.
	Conglomerate from the Pyrenees	This rock is composed of rocks.