A thin rock section of Barytes was viewed using crossed polarising filters. Barytes is an ore Rock and contains Barium Sulphate, also known as Heavy Spar. Used in oil drilling to pump down the well to lubricate the cutting head and its heaviness to prevent the oil/gas under pressure from blowing back up to the surface.
This sample from Derbyshire near Castleton, famous for ‘Blue John’ fluorite.
90mm square coasters printed by dye sublimation to give a vibrant, high gloss, scratch resistant finish.
Supplied with a description on the back of the coaster.
Buyany four coasters for £16orany six for £22 – just order the 4 or 6 coaster listings and put the numbers of the coasters you want into the text box. Mix them up for variety or get a matching set – whichever you want.
Free UK delivery on orders over £10 (£1 delivery charge for orders below £10).
Orders are normally sent out within 2 working days.