What is a mineral formed by sedimentation?
the rear brake has a return spring, it may be weak, and not returning completely
unplug the wires going to the switch(probably in the headlight bucket)
Simply remove your brake lever and inspect the switch. You should be able to tell easy enough if it's stuck or broken.
Calcite (CaCO3), aragonite (also CaCO3, but with a different crystal structure), dolomite ((Ca,Mg))CO3)2, gypsum (CaSO4.2H2O) are all common chemical sedimentary minerals. In the extreme evaporation of ocean water, one can develop halite (NaCl) and a wide range of potassium, magnesium, and even mixed Ca-Na salts. In some portions of very deep water, for example in the Black Sea, sulfide minerals, often a mono-sulfide usually called Macinawite (nominally FeS) can precipitate within black, carbon-rich muds. In zones of very high biological activity and upwelling, calcium phosphate minerals can form (large deposits exist in both Florida and Idaho with in the US. Mark L.
