Chocolate Calcite Cluster with stand kit siliceous colloid and arsenic sulfides

siliceous colloid and arsenic sulfides precipitated nearly simultaneously

Kunming City

Crystals aggregate densely in layered flower-like clusters with varied crystal sizes and staggered orientations

or dendritic (branch-like) inclusions that resemble falling snow or feathers against its often purple

Aquamarine from Mount Xuebaoding

Chocolate Calcite Cluster with stand kit siliceous colloid and arsenic sulfidesChocolate Calcite Cluster from Leiping Mine, Chenzhou, Hunan, China, featuring a special layered structure: the core is chocolate brown calcite, encased by a transparent thin calcite shell. These large rhombohedral crystals have flat faces, sharp edges and parallel growth striations with strong vitreous luster. Iron minerals dye the core into uniform chocolate tone, with yellowish brown original growth bands enclosed inside. Intergrown crystals form