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Gold/Mining/Energy : Gold and Silver Juniors, Mid-tiers and Producers -- Ignore unavailable to you. Want to Upgrade?

To: marcos who wrote (15125)	7/4/2006 12:28:01 PM
From: E. Charters	Respond to of 78419

Most black till sands are coloured by Fe304 which is magnetite. Picks up with a magnet. Some Fe203 or FeO sands i.e. hematite and magnetite, may be red, to red brown in colour, although hematite sands could be black in that hematite may be steel-gray as well as red. Hematite is the oxidization product of magnetite and began to form more predominantly in our oxygen-atmospheric history, i.e. the proterozoic. Magnetite may in some cases be the oxidization of a FeS (brass-yellow sulphide, also found in sands.) Magnetite as well did not form it is thought until the planet had an oxygen atmosphere, some 2 billion years following its birth. The possibility of O2 coming from water is not considered, but ionization of H20 could have oxidized some minerals under exceptional conditions. Some sands could be dark or black without magnetite. Magnesite sands are not found occasionally and could be blue to black in certain locations. Olivine sands are found and could be dark, although microscopic olivine seems yellow, it alters to a dark greenish tinge. Some pyroxene sands could be quite dark. California black sand. Valuable Minerals in sand sdnp.org.gy California Magnetite sand Hawaii sand. Don't make an Ash of yourself. Mt. St. Helens. microscope-microscope.org