Crystals acting as possible reservoirs for necessary components

4 Crystals acting as possible reservoirs for necessary components 

Various bacteria, such as spherical bacteria, bacillus, and fibrous bacteria, selectively precipitate inorganic crystals around the surface of the bacterium, though the reasons for this are unclear [13]. Although many studies have been performed on the precipitation of inorganic crystals around bacteria in relation to 

Many mineral species are known to be selectively crystallized by the presence of bacteria. Carbonate minerals, such as calcite, aragonite, hydroxycalcite, and siderite oxide minerals, such as magnetite and todorokite oxalate minerals, such as whewellite and weddellite sulfide minerals, such as pyrite, sphalerite, wurtzite, greigite, and mackinawite and other minerals, such as jarosite, iron-jarosite, and g3q sum, are known to precipitate in the presence of bacteria. Therefore, investigations have been developed to analyze the formation of banded iron ore by the action of bacteria, and to analyze the ancient environmental conditions of the Earth through the study of fossilized bacteria. 

Minerals formed by bacterial activity are formed outside the cell. Since they are so small, very little information has been obtained relating to the characteristics of their morphology, but it seems that they exhibit idiomorphic polyhedral form, although their alignment is not regular. 

Watabe, Biomineralization, Wonders of Formation of Minerals in Living Things, Tokyo, Tokai University Press, 1997 (injapanese) 

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