Cobalt Calcite (Cobaltoan) ClustersSmall: Between 1.5" to 2.5"Large: Between 2.5" to 3.5:Quantity per order: 1 ClusterCobaltoan calcite contains small amounts of the accessory element cobalt that imparts a distinctive, bright, pink-magenta color. The physical properties of cobaltoan calcite are the same as those of calcite. The pink-magenta color of cobaltoan calcite is diagnostic. Calcite forms in many mineralogical environments; when cobalt is present, it crystallizes as the cobaltoan variety.Cobalt calcite has similar properties to pink calcite - helping to heal the heart with it's gentle vibrations. Sometimes, it is referred to as the stone of hope, and is recommended for anyone going through a difficult time. Pink cobalto calcite heals your inner child, and any past abuse, so it is an excellent choice for PTSD sufferes and anyone recovering from abuse.