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At Zhemchug hot springs, southwest Lake Baikal, Russia, the biomats contain high concentration of Ca and Sr, which microbiological, chemical and mineralogical analyses were carried. Optical and scanning electron microscopic observation revealed that carbonate minerals were associated with cyanobacteria. The biomats have colorful layered structure, such as green, white, brown and black. Chemical analysis of the biomats revealed high concentration of CaO (85-96 wt%) and SrO (1.1-2.2 wt%) in thefatcat:nzckpxpynfbwdnp4nduq3onoye