Akaigawa, Hokkaido, Japan, todorokite occurs as an alteration product of inesite () and rhodochrosite ). It is found as very fine fibrous flakes about 0.05 mm in length, loosely aggregated in sponge-like masses in druses in gold-bearing quartz veins. The original sample was rather impure since it contained a total of 2.43% insoluble phosphorus salts () and silica (). Other localities Austria At Huttenberg, Carinthia, Austria, todorokite occurs as nodular masses about 5 cm in diameter, with a fibrous structure and coarse concentric layering. It is fragile, soft and porous, and so light that it can float on water. It is brown, but lighter in color than samples from Charco Redondo in Cuba. The luster of fracture surfaces is dull, but the smooth outer surface of the nodules has a faintly bronze-like appearance. It has a relatively high barium content, and also , perhaps due to a small admixture of pyrolusite (). Brazil Todorokite is a rare constituent of the manganese oxide deposits at Saude and Urandi, in Bahia, Brazil, as a result of supergene enrichment of the metamorphic country rock that contains spessartine () and other manganese minerals. Cuba At Charco Redondo in Oriente Province, Cuba, fibrous todorokite has been found with fibers to 10 cm in length. It is dark brownish black with a weak silky sheen on fracture surfaces, otherwise the luster is dull. It is difficult to measure the specific gravity because of the fibrous structure; measured values between 3.1 and 3.4 are probably too low. Hardness is low but cannot be measured accurately. Commonly associated minerals are pyrolusite, cryptomelane, manganite, psilomelane, quartz, feldspar and calcite. The manganese ores are interbedded with volcanic tuff, jasper and limestone. The todorokite has been altered near the surface and along faults or fissures to pyrolusite, and perhaps to manganite. The source of the manganese was probably hot springs. Portugal At Farragudo in the Algarve, Portugal, a stalactitic mass of todorokite was found in a small collection of secondary manganese minerals, chiefly cryptomelane ). It is soft and porous, with a fibrous mode of aggregation and dark brown to brownish black color. South Africa Large crystals have been found in the Smartt Mine, Hotazel, and elsewhere in the Kuruman district, Cape Province, South Africa. United States At Sterling Hill, New Jersey, todorokite has been identified in a small collection of secondary manganese oxides from the old surface workings. It forms