Darius Bell and the Glitter Pool (Darius Bell, #1)

The Bell family's ancestors were showered with honours, gifts and grants of land. In exchange, they have bestowed a Gift, once every 25 years, on the town. The Gifts have ranged from a statue to a bell tower with stained-glass windows, but now it's Darius's father's turn - and there is no money for an impressive gift. It looks as though a wheelbarrow full of vegetables is the best they can do. Darius is determined to maintain family honour, and when an earthquake reveals a glorious cave, with the most beautiful minerals lining the walls, he thinks he's found the answer ...