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Christmas reader offer!

Thunder Egg 101. Thunder Eggs typically form in tennis-ball-sized pockets in volcanic rhyolites. The centre is generally filled with variants of chalcedony - agate, jasper or opal - and, as here, quartz and selenite are often also present. For the Christmas season Geoscientist has extended its special offer with Earth Images, the website that features the world’s largest private collection of rock and mineral images, available as fine art prints and canvases (see Geoscientist 19.6, cover and p7)

The collection, amassed by Richard Weston, professor of Architecture at Cardiff University, has been added to since its spring launch, and for Christmas they have also introduced the ‘Favourites Collection’, ready-to-hang canvases in presentation gift boxes – perfect Christmas gifts at just £25 each.

Here you’ll find 20 stunning images from beautifully translucent Fluorites, intriguing Paesina stones, a really fine Thunder Egg and some exceptional Agates. As before, Earth Images is offering a 10% discount to Fellows on prints and canvases, with a further 10% of the purchase price donated to the Society.
  • Go to www.earth.uk.net and enter code G102 when you reach the basket stage of the online purchase.