The Rock Library

The Rock Library is an online resource on minerals and rocks operated by The Royal School of Mines, Imperial College London.

[The Rock Library @Rock_Library]

Gneissose banding and pegmatite in an Archean granite gneiss from the Pilbara craton, Australia. These diapirs squeeze the greenstone belts.

[The Rock Library @Rock_Library]

Pyrolucite (manganese oxide) in a synsedimentary breccia formed as an Archean palaeosol on dolomite. From Pilbara, Australia.

[The Rock Library @Rock_Library]

Ripple cross lamination with hematite in the 2.5 billion year banded iron formation at Paraburdoo, Pilbara, Australia. @ImperialRSM

[The Rock Library @Rock_Library]

Conical stromatolites in the 3.43 billion year old Strelley Pool Chert in Pilbara, Australia. Old critters! @ImperialRSM

[The Rock Library @Rock_Library]

Archean jasperite at Marble Bar, Pilbara, Australia. A 3.46 billion year old chert. @ImperialRSM

[The Rock Library @Rock_Library]

Normal faults in Triassic sediments on a wavecut platform east of Watchet, Somerset. Seeing geology by drone. @ImperialRSM

[The Rock Library @Rock_Library]

@pavementgeology @ImperialRSM Hi Ruth, always retweeting when I mean to reply! This is a cool rock. Was tempted to call it a migmatite. I must come on your tour sometime.

[The Rock Library @Rock_Library]

Amphibolite with folded veins of quartz, feldspar and hornblende. St Paul's underground station, London. @ImperialRSM

[The Rock Library @Rock_Library]

Every day the Rock Library is attacked by hackers. So sorry to all the students and staff who rely on us. We are repairing malicious damage.

[The Rock Library @Rock_Library]

F2 folds with crenulation cleavage in black phyllite and metasiltstone, Falmouth, Cornwall. #fieldworkfriday for the RSM's Paul Garrard

[The Rock Library @Rock_Library]

Like a knife through butter. Cutting a slice through a basalt with a mantle xenolith - using a rock saw to make a #ThinSectionThursday

[The Rock Library @Rock_Library]

Lamproite from Oz with phlogopite phenocrysts in a groundmass with richterite and leucite. The world's deepest magma. #ThinSectionThursday

[The Rock Library @Rock_Library]

The Rock Library's Matt Genge on the rocks of Australia House in London https://t.co/ksbJNRvlk1

[Matthew Genge @rockbloke]

The Australian High Commission have just released a video of my geology tour of Australia House
https://t.co/YaCFEgi6nK @imperialRSM

[The Rock Library @Rock_Library]

Rock library in the field. Spindle bombs and matle xenoliths from a leucite basanite scoria cone in Sardinia @chpet @AAlechiarenza

[The Rock Library @Rock_Library]

Parallel agate-bearing vugs in a basaltic andesite sill injected into wet pyroclastics in Sardinia. @AAlechiarenza @chpet @peterophysics

[The Rock Library @Rock_Library]

Through cross beds in Triassic sandstones never fail to impress, particular in Sardinia. @AAlechiarenza @chpet @peterophysics

[The Rock Library @Rock_Library]

Metagabbro...Silurian back-arc basin magma at greenschist facies. In Sardinia...with @rockbloke @AAlechiarenza @peterophysics

[The Rock Library @Rock_Library]

Mantle xenoliths with pyroxenite veins and phlogopite megacrysts from Sardinia. Mantle fieldwork with @chpet @rockbloke @AAlechiarenza

[The Rock Library @Rock_Library]

Ignimbrite with rheomorphic flow in rotated lithic clasts. Field petrology in Sardinia with @rockbloke @chpet @AAlechiarenza @peterophysics

[The Rock Library @Rock_Library]

Nature's chocolate egg - a particulary brown agate nodule. Happy Easter from the Rock Library.