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Day 82 : Hollington Sandstone block from church next to Barlaston Hall, once home of Josiah Wedgwood.

Day 81 : Hemimorphite (zinc silicate) from Mina Ojuela, Mapimi, Durango Mexico. Keele Collection

Day 80 : Repeating a field day so a return to Wenlock Edge.  This is the zig-zag margin of a Wenlock patch reef in Lea Quarry.

Day 79 : A field photo from Knowle Quarry, Presthope, Much Wenlock, Shropshire.  The original GSSP for the Wenlockian, here are reef knolls and background sedimentation.  The face is also a fault plane with red iron staining and horizontal slickenside lineations.

Day 78 : This sample of prehnite (calcium aluminium silicate hydroxide) is from Barr Head, Renfrewshire, Scotland. Keele collection. It was the first mineral to be named after someone (Colonel Hendrik Von Prehn) rather than somewhere.

Day 77 : Epidote, from Alaska. Keele Cotton Collection.

Day 76 : Chlorite. Locality unknown. Keele collection.

Day 75 : Kyanite, named from the Greek for deep blue, this is the high pressure, low temperature polymorph of  aluminium silicate. Keele Collection.

Day 74 : Serpentine from Iona, Scotland, where it is locally known as Iona Greenstone or Columba's Tears. Keele Collection

Day 73 : Tafoni, or honeycomb weathering, is thought to be formed by the assistance of salt.  This tafoni is forming on sandstone blocks on the outer wall of Bamburgh Castle in Northumberland, exposed to the salt-water laden sea air.