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| | Encyclopedia of Japanese Minerals, by Alfredo Petrov |
 | | Saitama: Boulangerite forms soft cottony aggregates filling cavities to several cm wide at the Chichibu mine, associated with white 2mm crystals of a rhombohedral carbonate (dolomite?). |
 | | Saitama: Good bournonite crystals as thick tabular "cogwheel" twins, with repeated twinning on the [110] plane, usually small, but sometimes up to 2.5cm wide and 1cm thick, were found in skarn at the Daikoku adit of the Chichibu mine 30 years ago, associated with ankerite, galena, sphalerite, pyrite, chalcopyrite, arsenopyrite. |
 | | Saitama: As pale brownish fibres forming radial aggregates of silky luster, associated with rhodonite in contact metamorphic Cu-Pb-Zn ore at the Chichibu mine. |
| www.petrovrareminerals.com /articles02b.html (4510 words) |
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