Kate very difficult to do, but if you have an unglazed plate Jet will leave a chocolate brown streak when you rub along it.

Landguard Ranger Kate Are you sure its Jet, looks a bit like coal ?

Yes @MrsChap12 :) I would say so GeoSuffolk

Banded Flint @MrsChap12 Am sure @geosuffolk can explain formation in 140 characters hee hee

Less than a week til #TtT ends Please follow me Kate 4 #summer #beachcombing #fun beachbonkers.org.uk

Kate GeoSuffolk Jet looks and feels like plastic , it will leave a brown streak on porcelain

Steve Trewhella Kate I haven't had it checked, but I think it is most likely to be coal after all :-(

@MrsChap12 Kate GeoSuffolk can I throw left over portable barbeque charcoal into the mix? It's very light too & left on beaches

Leave it a bit longer and it might become a diamond ;) Tracey @MrsChap12 GeoSuffolk

Found on a Kate beach walk a piece of Carboniferous limestone u can see corals within it. #FossilFriday

This little #book perfect 4 the train-full of fascinating info Who knew #urchin was dialect for #hedgehog!

Kate I completely loved this series of books as a child - always something useful in them and great pictures and illustrations.

So much info but not at all heavy :) Carole Souter

Weird 2c #shingle #beach at #hamptoncourt #flowershow #hats off for getting #yellowhornedpoppies to bloom on cue!

Every year different #gardening #WinnersAndLosers #bindweed #wildflowers #poppy &monster #teasel #EmbraceTheChaos :)

4 seconds of #bee and #bramble #heaven #gardening4wildlife @ginbat Brigit Strawbridge

Fabulous weather for #ducks #Grundisburgh #Suffolk I am going to miss them so much!!!

Congrats to Kate, amazing work on #Suffolk coast. We love this film! bit.ly/1wwUDef @HLFEoE x.com/TouchingTheTid…

COME TO THE BEACH! Beachcombing this Sat at 230 & 330 Visit Felixstowe #30DaysWild from The Wildlife Trusts beachbonkers.org.uk/come-to-the-be…