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Day 152 : The second day of fault rock week. This is a protocataclasite, cataclazed Urgonian Marble from the North Pyrenean Fault Zone at Saint-Béat, France

Day 151 : The dark, fine-grained rock in the centre of the image is pseudotachylite. Literally a ‘false’ tachylite (basaltic glass), a pseudotachylite is formed when frictional heat from earthquake faulting melts the host rock which then chills instantly forming a glass. The host rock here is a biotite acid …

Day 150 : The final eclogite from eclogite week is from the Mariánské Lázn? Complex in the west Czech Republic. Keele Collection.

Day 149 : The sixth day of eclogite week and an German eclogite from Hoflas, Fitchelgebirge

Day 148 : A Scottish eclogite from the Lewisian inler, Glen Beag, Glenelg. Keele collection.

Day 147 : Day four of eclogite week. This time a Norwegian eclogite from Lone near Bergen

Day 146 : … and day three of eclogite week. This specimen from Knockormal Farm, Girvan, Scotland. Keele Collection.

Day 145 : A second eclogite, this time from Lago Mucrone, Santuario Di Oropo, Italy. Keele Collection

Day 144 : It is eclogite week here at Rock365. These beautiful rocks are from the Earth’s mantle. This is from the lawsonite type locality, Reed Station on the Tiburon Peninsula, Marin County, California. Keele collection.

Day 143 : Bronzite is a ferrous variety of enstatite with a bronze sub-metallic lustre. Locality unknown, Keele collection.