There are a huge number of resources available both on the internet and offline for learning more about crystals, both geologically and metaphysically. Here are some of our favourites:
https://ukfossils.co.uk/ - a really great website for finding fossils around the UK
www.mindat.org - an invaluable resource for the geology surrounding crystals and minerals
DK Nature Guide - Rocks and Minerals
This book gives an excellent insight into the world of rocks and minerals. It's packed with information on different types of rock formations and the physical features of a huge variety of crystals. A must have for everyone from beginner to expert.
Geology For Dummies
An introduction to geology for those who want more background on the science of crystals, the earth and how they are formed.
Opals of the Never Never, Robert Haill
For anyone who's into Opal, this book about Australian Opal is well worth having. It's not easy to find, but is a great read.
The Crystal Bible, Judy Hall
Judy Hall has written a huge amount of resources on crystal healing and the metaphysical properties of crystals, and is probably one of the biggest sellers around the world.
Philip Permutt has written a number of excellent books on the metaphysics of crystals. Here are some of my personal favourites:
Crystal Grids, Kiera Fogg
This excellent book on crystal grids details each of the different grids and layouts, and has information on the uses for each crystal in the grid formation.
The Chakra Project, Georgia Coleridge
This hardback book goes into wonderful detail about the chakras, and has real life case studies.
Places to visit
The Natural History Museum, London
London's NHM has two amazing galleries full of incredible minerals and gemstones. Don't miss the Vault upstairs where you can see the Medusa Emerald and a stunning collection of 296 coloured diamonds!
Treak Cliff Caverns, Derbyshire
Treak Cliff Caverns is the only place in the world where Blue John can be found. It's a purple, yellow and clear banded Fluorite, and mining is very limited today.