As nouns the difference between alga and lamalginite

is that alga is any of many aquatic photosynthetic organisms, whose size ranges from a single cell to giant kelps and whose form is very diverse; some are eukaryotic and some prokaryotic; includes the seaweeds while lamalginite is an alginite found in sapropel and composed of thin-walled colonial or unicellular algae that occur as distinct laminae, cryptically interbedded with mineral matter.