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416 pages, Kindle Edition
First published March 1, 2011
The original prospector had extensively surveyed it. The stroid was primarily metal ore. It was a big one: about three by three by ten kilometers in size, roughly barbell-shaped. Its albedo was high -- typical for nickel-iron rocks. Its mean density had been 5.8 grams per cubic centimeter -- nearly three times Phocaea's. One end of the barbell consisted of a big lump of crumbly silicates; the result of a collision with a silica rock sometime in the distant past. But the bulk of the stroid was high-grade ore.