Instrument data from three buoys in Lake Superior provide a reliable record of water temperatures since about 1980, and the information also shows that, with water temperatures running in the mid-to-upper 60s (and even warmer closer to shore), âwe are at record temperatures for this time of year,â according to Austin.
The talc is formed by the alteration of sedimentary magnesium carbonate rocks (dolomite and magnesite) at elevated temperature and pressure below the earth's surface. While the magnesium is fixed in situ, the silica is transported by silica-containing hot fluids to react with the Magnesium- bearing carbonates to form talc. These altered rocks are then talc-rich dolomites or magnesites. This type of deposits usually deliver the massive talcs accompanied by carbonates, chlorite and some quartz.
Talcum Powder. Often referred to as  talc , it is a mineral composed of hydrated magnesium silicate in the loose form. Interestingly it is used in many industries, including electrical switchboards, due to its resistance to heat.his is a powder using talc or cornstarch and contains calamine, which is a combination of zinc oxide and iron oxide. It has mild antipruritic (anti-itching agent), antiseptic and astringent properties. On a positive note, at least one cyclist has had a positive experience with every item on this list.