Microspherulite

Figure 1: Oolites observed with a transmitted light microscope.

Figure 2: Group of iberulites observed under Scanning Electron Microscope (SEM). The arrows show vortex position.

Figure 3: Solid glass microspheres used like ingredients in road and street signaling paintings.

Microspherulites are microscopic spherical particles with diameter less than two mm, usually in the 100 micrometre range, mainly consisting of mineral material (the Greek litos means "stone"). Only bodies created by natural physico-chemical processes, with no contribution of either biological (in aqueous sedimentary environments this contribution is possible) or human activity, are considered to be microspherulites. Generally speaking, the common feature (sphericity) indicates that each sphere represents an internal equilibrium of forces within a fluid medium (water, air).

单词	Microspherulite
释义	Microspherulite 英语百科 Microspherulite Microspherulites are microscopic spherical particles with diameter less than two mm, usually in the 100 micrometre range, mainly consisting of mineral material (the Greek litos means "stone"). Only bodies created by natural physico-chemical processes, with no contribution of either biological (in aqueous sedimentary environments this contribution is possible) or human activity, are considered to be microspherulites. Generally speaking, the common feature (sphericity) indicates that each sphere represents an internal equilibrium of forces within a fluid medium (water, air).
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