Blue Celestite geodes directly from Norcross-Madagascar deposits. We supply the majority of the Celestite that leaves the island. We work directly with the local people on extraction, grading, processing, and packaging, and offer you our best select Celestite crystals. Blue Celestite geodes, Blue Celestite specimens, Blue Celestite crystals, Blue Celestite spheres and eggs, and more are available at Madagascar Minerals. What is this blue crystal called Celestite? As a mineral, Celestite is composed of strontium sulphate. It is a relatively soft collector's gemstone. Natural Blue crystals are rare.