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To: marcos who wrote (17788)	8/8/2006 10:29:16 AM
From: Metacomet	Read Replies (1) \| Respond to of 78412

These guys found a whole lot of magnetite.... borealis.gi

To: marcos who wrote (17788)	8/8/2006 11:52:17 AM
From: E. Charters	Respond to of 78412

The way you look for magnetite crystals in rock is to suspend a magnet on a string, or balance a pencil magnet from its swing, and hold it very still and move the rock near its tip. A crystal of magnetite will draw the magnet over suddenly and firmly. The crystal should be a tetrahedron, black and usually about 1/3 to a half the size of a rice grain. Crystals have usually one point sticking out of the 6 tetrahedron points. Magnetite may also be in aggregates or bands. Black is the colour normally. Hematite (Fe203), the preferred iron ore and its more oxygenated cousin, is not magnetic and colour varies from steel gray to red. Crystals are formless aggregates to roseates. Pyrrhotite may not be magnetic but often is. It appears to be an orangeish or whitish pyrite. Its chemical formula is higher in iron than Pyrite. Hence its weak but noticeable magnetism. If a crystal of pyrite or a yellow sulfide appears magnetic, it could be pyrrohtite. This sulfide is oftenassociate with copper deposits and/or nickel. It may contain nickel itself. Another magnetic mineral is ilmenite. Its magnetism is weak. It appears black and often turns up in river and beach sands and is very common. It is one of the chief ores of Titanium. galleries.com Ilmenite Chromite That greasy rock forming a soap is intriguing. I am not sure what you are running into there. It could be an oxide coating that is brushing off, or clay alteration, or it could be in some cases soapstone. I am not sure if steatite has this character or what you are seeing is something else. en.wikipedia.org MAny of the rocks of the coast are sediments, namely seafloor sediments reworked and metamorphosed weakly to sometimes more resistant rocks. Shale could be turned to phyllite. There are a fair number of volcanic rocks in those ranges, and maps should tell you where those centres are. Intrusives of course are common as well, both felsic and mafic. It depends on exactly where you are. Rocks you may get are, in no particular order: sediments Sandstone quartzite arenite Chert Phyllite Shale Slate Conglomerate volcanics rhyolite andesite dacite basalt tephra bentonite volcanic rocks may be flows, breccias, tuffs or porphyries or other pyroclastic rocks. intrusives granodiorite diorite granite gabbro textures and colours of rocks may vary widely with alteration and area.