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 Gemworld Book 1 by John Vornholt
Dazzling to behold, Gemworld is one of the wonders of the Federation: an artificial world composed entirely of crystal, its atmosphere held in place by a sophisticated network of force fields. Home to a half dozen different sentient races, this singular world is a low-gravity playpen of mammoth spires, endless fractal staircases, gemstone arcs, and dazzling prisms, oil carefully nurtured by the planet’s many inhabitants — until now.

Lieutenant Melora Pozlor, who previously served on Deep Space Nine, is currently stationed aboard the Starship Enterprise where an urgent telepathic summons alerts her to the danger threatening her homeworld.

The crystals that once sheltered her people, and several other alien species, are now growing at a vastly accelerated and uncontrollable rate, wreaking havoc throughout the planet. Captain Picard orders the Enterprise on a rescue mission to Gemworld, but they arrive to find a world in chaos — and an unexpected menace that traps the crew of the Enterprise along with the fragile civilization they hoped to save!