A virus is a microscopic being that can invade and destroy a cell. Viruses have some, but not all, of the characteristics of living things.
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By definition, a glass has little or no microscopic or molecular structure, although most glasses contain crystals or crystaline regions, often at a microscopic level, but these will be randomly distributed. Crystals are not glasses. Glasses are not crystalline.
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Certain algae is unicellular and microscopic. Multicellular algae can be microscopic, but often are not. Seaweed is an example of algae that is a single multicellular organism and not microscopic.
Crystallites are small, often microscopic crystals that, held together through highly defective boundaries, constitute a polycrystalline solid. Metallurgists often refer to crystallites as grains.
A small rocky object that orbits the Sun is an asteroid. The Asteroid Belt, a collection of many asteroids, is located between Mars and Jupiter.